sample numbers for Overo Earth power consumption
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sample numbers for Overo Earth power consumption
 
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Like some other Gumstix users, I am struggling to reduce the Gumstix
power consumption to be more in line with other OMAP3 platforms. In the hope that it helps others with similar struggles, this documents what power savings I achieved and how each incremental improvement was done. Since test setup can make a significant difference, here is my test setup: gumstix Overo Earth gumstix Pinto-TH (modified) USB to TTL serial cable (FTDI TTL-232R-3V3) I chose the Pinto-TH because it has the least amount of claptrap. (Things like Ethernet and low-power consumption tend to be mutually exclusive.) Alas, the Pinto-TH has perhaps too little claptrap, as there is no built-in method to easily access the console. To remedy this, I white-wired the Pinto-TH PCB to use the onboard 74x245 to translate the console signals (GPIO165_IR_RXD3 and GPIO166_IR_TXD3) to 3.3V. I then used a FTDI TTL-232R-3V3 cable to provide a convenient USB serial port connection. I powered the Pinto-TH with a 6VDC bench supply and measured power with a bench multimeter. All measurements of power consumption are with an idle shell prompt and no extra software running. 768 mW : defacto Sakoman mainline kernel linked to by the Gumstix site 750 mW : (saved 18 mW) removal of two LEDs on Pinto-TH board 624 mW : (saved 126 mW) switched to bleeding edge Linux OMAP3 PM kernel 264 mW : (saved 360 mW) enabled 'sleep while idle' 180 mW : (saved 84 mW) forced USB3326 chip into reset via GPIO183 174 mW : (saved 6 mW) turned off blue LED via "GPIO211" and kernel patch 168 mW : (saved 6 mW) enabled 'off mode' It is unclear to me what actions are taken (if any) in the TPS65950 by 'sleep_while_idle' and 'off_mode', and given that the Gumstix is a black box (no schematic), it is hard to know how the supplies are used and what can be safely turned off. Neither of the kernels actually ever turn off VDD1, VDD2, for example. Both the Linux OMAP PM and the latest mainline Sakoman kernels do something to alter power consumption (but it only could be internal to the OMAP3). 'sleep_while_idle' was enabled with the following: mkdir /debug mount -t debugfs debugfs /debug echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout echo 1 > /debug/pm_debug/sleep_while_idle 'off_mode' was enabled with the following: mkdir /debug mount -t debugfs debugfs /debug echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout echo 1 > /debug/pm_debug/sleep_while_idle echo 1 > /debug/pm_debug/enable_off_mode Holding the USB3326 in reset was achieved with the following: echo 183 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio183/direction echo 0 > /sys/class/gpio/gpio183/value Disabling the blue LED (D3) was achieved by patching the kernel (See Federico Belvisi's post to this mailing list on 2010-09-21.) and the following: echo 211 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio211/direction echo 1 > /sys/class/gpio/gpio211/value ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users |
Re: sample numbers for Overo Earth power consumption
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Here are my settings for the PMIC. I turn off a few voltage rails and
keep the USB PHY off. TPS_49.GPIO_CTRL ,0x00 TPS_49.GPBR1 ,0x00 TPS_4A.KEYP_CTRL_REG ,0x03 TPS_4A.CTRL1 ,0x00 TPS_4A.BCIMDKEY ,0x2A TPS_4B.BOOT_BCI ,0x30 TPS_4A.LEDEN ,0x00 TPS_49.CODEC_MODE ,0x00 TPS_49.OPTION ,0x00 TPS_49.BT_IF ,0x04 TPS_49.VOICE_IF ,0x04 TPS_49.AUDIO_IF ,0x04 TPS_49.MICBIAS_CTL ,0x00 TPS_49.ANAMICL ,0x00 TPS_49.ANAMICR ,0x00 TPS_49.AVADC_CTL ,0x00 TPS_49.ALC_CTL ,0x05 TPS_49.AVDAC_CTL ,0x00 TPS_49.ARXL1_APGA_CTL ,0x32 TPS_49.ARXR1_APGA_CTL ,0x32 TPS_49.ARXL2_APGA_CTL ,0x32 TPS_49.ARXR2_APGA_CTL ,0x32 TPS_49.VDL_APGA_CTL ,0x32 TPS_49.EAR_CTL ,0x00 TPS_49.PREDL_CTL ,0x00 TPS_49.PREDR_CTL ,0x00 TPS_49.PRECKL_CTL ,0x00 TPS_49.PRECKR_CTL ,0x00 TPS_49.HFL_CTL ,0x00 TPS_49.HFR_CTL ,0x00 TPS_49.HS_GAIN_SET ,0x00 TPS_49.DTMF_CTL ,0x00 TPS_49.APLL_CTL ,0x06 TPS_48.OTG_CTRL ,0x06 TPS_48.IFC_CTRL ,0x00 TPS_48.CARKIT_PLS_CTRL ,0x00 TPS_48.PHY_CLK_CTRL ,0x06 TPS_48.OTHER_IFC_CTRL ,0x84 TPS_48.OTHER_FUNC_CTRL ,0x00 TPS_48.POWER_CTRL ,0x00 TPS_48.CARKIT_ANA_CTRL ,0x08 ;enable analogue inputs (must be done before setting PHY_PWR_CTRL) TPS_48.CARKIT_CTRL ,0x00 TPS_48.PHY_PWR_CTRL ,0x01 ;save 30mA TPS_48.FUNC_CTRL ,0x09 TPS_4B.VIBRATOR_CFG ,0x00 TPS_49.VIBRA_CTL ,0x00 TPS_4B.VAUX1_DEV_GRP ,0x00 TPS_4B.VAUX2_DEV_GRP ,0x00 TPS_4B.VAUX3_DEV_GRP ,0x00 TPS_4B.VAUX4_DEV_GRP ,0x00 TPS_4B.VMMC1_DEV_GRP ,0x00 TPS_4B.VMMC2_DEV_GRP ,0x00 TPS_4B.VPLL2_DEV_GRP ,0x00 TPS_4B.VSIM_DEV_GRP ,0x00 TPS_4B.VDAC_DEV_GRP ,0x00 TPS_4B.VUSB1V5_DEV_GRP ,0x00 TPS_4B.VUSB1V8_DEV_GRP ,0x00 TPS_4B.VUSBCP_DEV_GRP ,0x00 TPS_4B.REGEN_DEV_GRP ,0x00 If you are not using the analogue inputs then you can add this also: TPS_4B.VUSB3V1_DEV_GRP ,0x00 On 9/24/10, Peter Lawrence <[hidden email]> wrote: > Like some other Gumstix users, I am struggling to reduce the Gumstix > power consumption to be more in line with other OMAP3 platforms. > > In the hope that it helps others with similar struggles, this > documents what power savings I achieved and how each incremental > improvement was done. > > Since test setup can make a significant difference, here is my test setup: > > gumstix Overo Earth > gumstix Pinto-TH (modified) > USB to TTL serial cable (FTDI TTL-232R-3V3) > > I chose the Pinto-TH because it has the least amount of claptrap. > (Things like Ethernet and low-power consumption tend to be mutually > exclusive.) Alas, the Pinto-TH has perhaps too little claptrap, as > there is no built-in method to easily access the console. > > To remedy this, I white-wired the Pinto-TH PCB to use the onboard > 74x245 to translate the console signals (GPIO165_IR_RXD3 and > GPIO166_IR_TXD3) to 3.3V. I then used a FTDI TTL-232R-3V3 cable to > provide a convenient USB serial port connection. > > I powered the Pinto-TH with a 6VDC bench supply and measured power > with a bench multimeter. > > All measurements of power consumption are with an idle shell prompt > and no extra software running. > > 768 mW : defacto Sakoman mainline kernel linked to by the Gumstix site > 750 mW : (saved 18 mW) removal of two LEDs on Pinto-TH board > 624 mW : (saved 126 mW) switched to bleeding edge Linux OMAP3 PM kernel > 264 mW : (saved 360 mW) enabled 'sleep while idle' > 180 mW : (saved 84 mW) forced USB3326 chip into reset via GPIO183 > 174 mW : (saved 6 mW) turned off blue LED via "GPIO211" and kernel patch > 168 mW : (saved 6 mW) enabled 'off mode' > > It is unclear to me what actions are taken (if any) in the TPS65950 by > 'sleep_while_idle' and 'off_mode', and given that the Gumstix is a > black box (no schematic), it is hard to know how the supplies are used > and what can be safely turned off. Neither of the kernels actually > ever turn off VDD1, VDD2, for example. Both the Linux OMAP PM and the > latest mainline Sakoman kernels do something to alter power > consumption (but it only could be internal to the OMAP3). > > 'sleep_while_idle' was enabled with the following: > > mkdir /debug > mount -t debugfs debugfs /debug > echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout > echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout > echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout > echo 1 > /debug/pm_debug/sleep_while_idle > > 'off_mode' was enabled with the following: > > mkdir /debug > mount -t debugfs debugfs /debug > echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout > echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout > echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout > echo 1 > /debug/pm_debug/sleep_while_idle > echo 1 > /debug/pm_debug/enable_off_mode > > Holding the USB3326 in reset was achieved with the following: > > echo 183 > /sys/class/gpio/export > echo out > /sys/class/gpio/gpio183/direction > echo 0 > /sys/class/gpio/gpio183/value > > Disabling the blue LED (D3) was achieved by patching the kernel (See > Federico Belvisi's post to this mailing list on 2010-09-21.) and the > following: > > echo 211 > /sys/class/gpio/export > echo out > /sys/class/gpio/gpio211/direction > echo 1 > /sys/class/gpio/gpio211/value > > ------------------------------------------------------------------------------ > Nokia and AT&T present the 2010 Calling All Innovators-North America contest > Create new apps & games for the Nokia N8 for consumers in U.S. and Canada > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > http://p.sf.net/sfu/nokia-dev2dev > _______________________________________________ > gumstix-users mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gumstix-users > ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users |
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R.P. McMurphy,
Where do you set all of these values? I currently set a few of these values, but I am pretty sure that I am not doing it in a clearly organized way, as your values below make it appear that you do.
Thanks On Thu, Sep 23, 2010 at 3:03 PM, R. P. McMurphy <[hidden email]> wrote: Here are my settings for the PMIC. I turn off a few voltage rails and -- Tyler Gore 617-505-4865(work) 503-860-0743 (cell) -- This email message, including any attachments, is intended solely for the use of the designated recipient(s) and may contain confidential, privileged, and or proprietary information. Any unauthorized review, use, disclosure or distribution is strictly prohibited. ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users |
Re: sample numbers for Overo Earth power consumption
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I initialise in this order:
1. GPIO pulled/driven to avoid conflicts and reset the peripherals 2. OMAP internal devices disabled and powered down 3. SDRAM & SRAM 4. I2C1 unit (for PMIC) 5. PMIC, as shown previously 6. Clocks, set 600MHz for fast OS loading 7. NAND load of system code On 9/24/10, Tyler Gore <[hidden email]> wrote: > R.P. McMurphy, > > Where do you set all of these values? I currently set a few of these > values, but I am pretty sure that I am not doing it in a clearly organized > way, as your values below make it appear that you do. > > Thanks > > On Thu, Sep 23, 2010 at 3:03 PM, R. P. McMurphy <[hidden email]> wrote: > >> Here are my settings for the PMIC. I turn off a few voltage rails and >> keep the USB PHY off. >> >> TPS_49.GPIO_CTRL ,0x00 >> TPS_49.GPBR1 ,0x00 >> TPS_4A.KEYP_CTRL_REG ,0x03 >> TPS_4A.CTRL1 ,0x00 >> TPS_4A.BCIMDKEY ,0x2A >> TPS_4B.BOOT_BCI ,0x30 >> TPS_4A.LEDEN ,0x00 >> TPS_49.CODEC_MODE ,0x00 >> TPS_49.OPTION ,0x00 >> TPS_49.BT_IF ,0x04 >> TPS_49.VOICE_IF ,0x04 >> TPS_49.AUDIO_IF ,0x04 >> TPS_49.MICBIAS_CTL ,0x00 >> TPS_49.ANAMICL ,0x00 >> TPS_49.ANAMICR ,0x00 >> TPS_49.AVADC_CTL ,0x00 >> TPS_49.ALC_CTL ,0x05 >> TPS_49.AVDAC_CTL ,0x00 >> TPS_49.ARXL1_APGA_CTL ,0x32 >> TPS_49.ARXR1_APGA_CTL ,0x32 >> TPS_49.ARXL2_APGA_CTL ,0x32 >> TPS_49.ARXR2_APGA_CTL ,0x32 >> TPS_49.VDL_APGA_CTL ,0x32 >> TPS_49.EAR_CTL ,0x00 >> TPS_49.PREDL_CTL ,0x00 >> TPS_49.PREDR_CTL ,0x00 >> TPS_49.PRECKL_CTL ,0x00 >> TPS_49.PRECKR_CTL ,0x00 >> TPS_49.HFL_CTL ,0x00 >> TPS_49.HFR_CTL ,0x00 >> TPS_49.HS_GAIN_SET ,0x00 >> TPS_49.DTMF_CTL ,0x00 >> TPS_49.APLL_CTL ,0x06 >> TPS_48.OTG_CTRL ,0x06 >> TPS_48.IFC_CTRL ,0x00 >> TPS_48.CARKIT_PLS_CTRL ,0x00 >> TPS_48.PHY_CLK_CTRL ,0x06 >> TPS_48.OTHER_IFC_CTRL ,0x84 >> TPS_48.OTHER_FUNC_CTRL ,0x00 >> TPS_48.POWER_CTRL ,0x00 >> TPS_48.CARKIT_ANA_CTRL ,0x08 ;enable analogue inputs (must be done >> before setting PHY_PWR_CTRL) >> TPS_48.CARKIT_CTRL ,0x00 >> TPS_48.PHY_PWR_CTRL ,0x01 ;save 30mA >> TPS_48.FUNC_CTRL ,0x09 >> TPS_4B.VIBRATOR_CFG ,0x00 >> TPS_49.VIBRA_CTL ,0x00 >> TPS_4B.VAUX1_DEV_GRP ,0x00 >> TPS_4B.VAUX2_DEV_GRP ,0x00 >> TPS_4B.VAUX3_DEV_GRP ,0x00 >> TPS_4B.VAUX4_DEV_GRP ,0x00 >> TPS_4B.VMMC1_DEV_GRP ,0x00 >> TPS_4B.VMMC2_DEV_GRP ,0x00 >> TPS_4B.VPLL2_DEV_GRP ,0x00 >> TPS_4B.VSIM_DEV_GRP ,0x00 >> TPS_4B.VDAC_DEV_GRP ,0x00 >> TPS_4B.VUSB1V5_DEV_GRP ,0x00 >> TPS_4B.VUSB1V8_DEV_GRP ,0x00 >> TPS_4B.VUSBCP_DEV_GRP ,0x00 >> TPS_4B.REGEN_DEV_GRP ,0x00 >> >> >> >> If you are not using the analogue inputs then you can add this also: >> >> TPS_4B.VUSB3V1_DEV_GRP ,0x00 >> >> >> On 9/24/10, Peter Lawrence <[hidden email]> wrote: >> > Like some other Gumstix users, I am struggling to reduce the Gumstix >> > power consumption to be more in line with other OMAP3 platforms. >> > >> > In the hope that it helps others with similar struggles, this >> > documents what power savings I achieved and how each incremental >> > improvement was done. >> > >> > Since test setup can make a significant difference, here is my test >> setup: >> > >> > gumstix Overo Earth >> > gumstix Pinto-TH (modified) >> > USB to TTL serial cable (FTDI TTL-232R-3V3) >> > >> > I chose the Pinto-TH because it has the least amount of claptrap. >> > (Things like Ethernet and low-power consumption tend to be mutually >> > exclusive.) Alas, the Pinto-TH has perhaps too little claptrap, as >> > there is no built-in method to easily access the console. >> > >> > To remedy this, I white-wired the Pinto-TH PCB to use the onboard >> > 74x245 to translate the console signals (GPIO165_IR_RXD3 and >> > GPIO166_IR_TXD3) to 3.3V. I then used a FTDI TTL-232R-3V3 cable to >> > provide a convenient USB serial port connection. >> > >> > I powered the Pinto-TH with a 6VDC bench supply and measured power >> > with a bench multimeter. >> > >> > All measurements of power consumption are with an idle shell prompt >> > and no extra software running. >> > >> > 768 mW : defacto Sakoman mainline kernel linked to by the Gumstix site >> > 750 mW : (saved 18 mW) removal of two LEDs on Pinto-TH board >> > 624 mW : (saved 126 mW) switched to bleeding edge Linux OMAP3 PM kernel >> > 264 mW : (saved 360 mW) enabled 'sleep while idle' >> > 180 mW : (saved 84 mW) forced USB3326 chip into reset via GPIO183 >> > 174 mW : (saved 6 mW) turned off blue LED via "GPIO211" and kernel patch >> > 168 mW : (saved 6 mW) enabled 'off mode' >> > >> > It is unclear to me what actions are taken (if any) in the TPS65950 by >> > 'sleep_while_idle' and 'off_mode', and given that the Gumstix is a >> > black box (no schematic), it is hard to know how the supplies are used >> > and what can be safely turned off. Neither of the kernels actually >> > ever turn off VDD1, VDD2, for example. Both the Linux OMAP PM and the >> > latest mainline Sakoman kernels do something to alter power >> > consumption (but it only could be internal to the OMAP3). >> > >> > 'sleep_while_idle' was enabled with the following: >> > >> > mkdir /debug >> > mount -t debugfs debugfs /debug >> > echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout >> > echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout >> > echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout >> > echo 1 > /debug/pm_debug/sleep_while_idle >> > >> > 'off_mode' was enabled with the following: >> > >> > mkdir /debug >> > mount -t debugfs debugfs /debug >> > echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout >> > echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout >> > echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout >> > echo 1 > /debug/pm_debug/sleep_while_idle >> > echo 1 > /debug/pm_debug/enable_off_mode >> > >> > Holding the USB3326 in reset was achieved with the following: >> > >> > echo 183 > /sys/class/gpio/export >> > echo out > /sys/class/gpio/gpio183/direction >> > echo 0 > /sys/class/gpio/gpio183/value >> > >> > Disabling the blue LED (D3) was achieved by patching the kernel (See >> > Federico Belvisi's post to this mailing list on 2010-09-21.) and the >> > following: >> > >> > echo 211 > /sys/class/gpio/export >> > echo out > /sys/class/gpio/gpio211/direction >> > echo 1 > /sys/class/gpio/gpio211/value >> > >> > >> ------------------------------------------------------------------------------ >> > Nokia and AT&T present the 2010 Calling All Innovators-North America >> contest >> > Create new apps & games for the Nokia N8 for consumers in U.S. and >> Canada >> > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in >> marketing >> > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store >> > http://p.sf.net/sfu/nokia-dev2dev >> > _______________________________________________ >> > gumstix-users mailing list >> > [hidden email] >> > https://lists.sourceforge.net/lists/listinfo/gumstix-users >> > >> >> >> ------------------------------------------------------------------------------ >> Nokia and AT&T present the 2010 Calling All Innovators-North America >> contest >> Create new apps & games for the Nokia N8 for consumers in U.S. and Canada >> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in >> marketing >> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store >> http://p.sf.net/sfu/nokia-dev2dev >> _______________________________________________ >> gumstix-users mailing list >> [hidden email] >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> > > > > -- > Tyler Gore > 617-505-4865(work) > 503-860-0743 (cell) > -- > This email message, including any attachments, is intended solely for > the use of the designated recipient(s) and may contain confidential, > privileged, and or proprietary information. Any unauthorized review, > use, disclosure or distribution is strictly prohibited. > ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users |
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In reply to this post by Peter Lawrence-5
Thanks Peter,
For the information, this is something we are struggling with at the moment. Kind regards James McGloin Managing Director Eointec Solutions ltd Tel: +353 (0)71 9851990 Mob: +353 (0)86 0642235 Fax: +353 (0)71 9852864 www.eointecsolutions.com bringing DSP solutions to market -----Original Message----- From: Peter Lawrence [mailto:[hidden email]] Sent: 23 September 2010 20:02 To: [hidden email] Subject: [Gumstix-users] sample numbers for Overo Earth power consumption Like some other Gumstix users, I am struggling to reduce the Gumstix power consumption to be more in line with other OMAP3 platforms. In the hope that it helps others with similar struggles, this documents what power savings I achieved and how each incremental improvement was done. Since test setup can make a significant difference, here is my test setup: gumstix Overo Earth gumstix Pinto-TH (modified) USB to TTL serial cable (FTDI TTL-232R-3V3) I chose the Pinto-TH because it has the least amount of claptrap. (Things like Ethernet and low-power consumption tend to be mutually exclusive.) Alas, the Pinto-TH has perhaps too little claptrap, as there is no built-in method to easily access the console. To remedy this, I white-wired the Pinto-TH PCB to use the onboard 74x245 to translate the console signals (GPIO165_IR_RXD3 and GPIO166_IR_TXD3) to 3.3V. I then used a FTDI TTL-232R-3V3 cable to provide a convenient USB serial port connection. I powered the Pinto-TH with a 6VDC bench supply and measured power with a bench multimeter. All measurements of power consumption are with an idle shell prompt and no extra software running. 768 mW : defacto Sakoman mainline kernel linked to by the Gumstix site 750 mW : (saved 18 mW) removal of two LEDs on Pinto-TH board 624 mW : (saved 126 mW) switched to bleeding edge Linux OMAP3 PM kernel 264 mW : (saved 360 mW) enabled 'sleep while idle' 180 mW : (saved 84 mW) forced USB3326 chip into reset via GPIO183 174 mW : (saved 6 mW) turned off blue LED via "GPIO211" and kernel patch 168 mW : (saved 6 mW) enabled 'off mode' It is unclear to me what actions are taken (if any) in the TPS65950 by 'sleep_while_idle' and 'off_mode', and given that the Gumstix is a black box (no schematic), it is hard to know how the supplies are used and what can be safely turned off. Neither of the kernels actually ever turn off VDD1, VDD2, for example. Both the Linux OMAP PM and the latest mainline Sakoman kernels do something to alter power consumption (but it only could be internal to the OMAP3). 'sleep_while_idle' was enabled with the following: mkdir /debug mount -t debugfs debugfs /debug echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout echo 1 > /debug/pm_debug/sleep_while_idle 'off_mode' was enabled with the following: mkdir /debug mount -t debugfs debugfs /debug echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout echo 1 > /debug/pm_debug/sleep_while_idle echo 1 > /debug/pm_debug/enable_off_mode Holding the USB3326 in reset was achieved with the following: echo 183 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio183/direction echo 0 > /sys/class/gpio/gpio183/value Disabling the blue LED (D3) was achieved by patching the kernel (See Federico Belvisi's post to this mailing list on 2010-09-21.) and the following: echo 211 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio211/direction echo 1 > /sys/class/gpio/gpio211/value ------------------------------------------------------------------------ ------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users |
Re: sample numbers for Overo Earth power consumption
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In reply to this post by R. P. McMurphy
R. P. McMurphy, thanks for the settings.
As a nasty temporary hack (just to see the impact), I stuck writes to CARKIT_ANA_CTRL and PHY_PWR_CTRL in the Linux kernel, and it had a huge impact. To update my numbers from the last email: 768 mW : defacto Sakoman mainline kernel linked to by the Gumstix site 750 mW : (saved 18 mW) removal of two LEDs on Pinto-TH board 624 mW : (saved 126 mW) switched to bleeding edge Linux OMAP3 PM kernel 264 mW : (saved 360 mW) enabled 'sleep while idle' 180 mW : (saved 84 mW) forced USB3326 chip into reset via GPIO183 174 mW : (saved 6 mW) turned off blue LED via "GPIO211" and kernel patch 168 mW : (saved 6 mW) enabled 'off mode' 54 mW : (saved 114 mW) PHY_PWR_CTRL disabled Clearly, there should be a better way in the Linux kernel to allow the user to optionally disable this as the application requires, but I haven't found the documentation on what is the *proper* way. If someone wanted to try the same nasty kernel hack, I added this two lines: twl_i2c_write_u8(TWL4030_MODULE_USB, 0x08 /* value */, 0xBB /* register (CARKIT_ANA_CTRL) */); twl_i2c_write_u8(TWL4030_MODULE_USB, 0x01 /* value */, 0xFD /* register (PHY_PWR_CTRL) */); in the function "twl_probe" in /drivers/mfd/twl-core.c just prior to the comment "load power event scripts". On Thu, Sep 23, 2010 at 6:03 PM, R. P. McMurphy <[hidden email]> wrote: > Here are my settings for the PMIC. I turn off a few voltage rails and > keep the USB PHY off. > > TPS_49.GPIO_CTRL ,0x00 > TPS_49.GPBR1 ,0x00 > TPS_4A.KEYP_CTRL_REG ,0x03 > TPS_4A.CTRL1 ,0x00 > TPS_4A.BCIMDKEY ,0x2A > TPS_4B.BOOT_BCI ,0x30 > TPS_4A.LEDEN ,0x00 > TPS_49.CODEC_MODE ,0x00 > TPS_49.OPTION ,0x00 > TPS_49.BT_IF ,0x04 > TPS_49.VOICE_IF ,0x04 > TPS_49.AUDIO_IF ,0x04 > TPS_49.MICBIAS_CTL ,0x00 > TPS_49.ANAMICL ,0x00 > TPS_49.ANAMICR ,0x00 > TPS_49.AVADC_CTL ,0x00 > TPS_49.ALC_CTL ,0x05 > TPS_49.AVDAC_CTL ,0x00 > TPS_49.ARXL1_APGA_CTL ,0x32 > TPS_49.ARXR1_APGA_CTL ,0x32 > TPS_49.ARXL2_APGA_CTL ,0x32 > TPS_49.ARXR2_APGA_CTL ,0x32 > TPS_49.VDL_APGA_CTL ,0x32 > TPS_49.EAR_CTL ,0x00 > TPS_49.PREDL_CTL ,0x00 > TPS_49.PREDR_CTL ,0x00 > TPS_49.PRECKL_CTL ,0x00 > TPS_49.PRECKR_CTL ,0x00 > TPS_49.HFL_CTL ,0x00 > TPS_49.HFR_CTL ,0x00 > TPS_49.HS_GAIN_SET ,0x00 > TPS_49.DTMF_CTL ,0x00 > TPS_49.APLL_CTL ,0x06 > TPS_48.OTG_CTRL ,0x06 > TPS_48.IFC_CTRL ,0x00 > TPS_48.CARKIT_PLS_CTRL ,0x00 > TPS_48.PHY_CLK_CTRL ,0x06 > TPS_48.OTHER_IFC_CTRL ,0x84 > TPS_48.OTHER_FUNC_CTRL ,0x00 > TPS_48.POWER_CTRL ,0x00 > TPS_48.CARKIT_ANA_CTRL ,0x08 ;enable analogue inputs (must be done > before setting PHY_PWR_CTRL) > TPS_48.CARKIT_CTRL ,0x00 > TPS_48.PHY_PWR_CTRL ,0x01 ;save 30mA > TPS_48.FUNC_CTRL ,0x09 > TPS_4B.VIBRATOR_CFG ,0x00 > TPS_49.VIBRA_CTL ,0x00 > TPS_4B.VAUX1_DEV_GRP ,0x00 > TPS_4B.VAUX2_DEV_GRP ,0x00 > TPS_4B.VAUX3_DEV_GRP ,0x00 > TPS_4B.VAUX4_DEV_GRP ,0x00 > TPS_4B.VMMC1_DEV_GRP ,0x00 > TPS_4B.VMMC2_DEV_GRP ,0x00 > TPS_4B.VPLL2_DEV_GRP ,0x00 > TPS_4B.VSIM_DEV_GRP ,0x00 > TPS_4B.VDAC_DEV_GRP ,0x00 > TPS_4B.VUSB1V5_DEV_GRP ,0x00 > TPS_4B.VUSB1V8_DEV_GRP ,0x00 > TPS_4B.VUSBCP_DEV_GRP ,0x00 > TPS_4B.REGEN_DEV_GRP ,0x00 > > > > If you are not using the analogue inputs then you can add this also: > > TPS_4B.VUSB3V1_DEV_GRP ,0x00 > > > On 9/24/10, Peter Lawrence <[hidden email]> wrote: >> Like some other Gumstix users, I am struggling to reduce the Gumstix >> power consumption to be more in line with other OMAP3 platforms. >> >> In the hope that it helps others with similar struggles, this >> documents what power savings I achieved and how each incremental >> improvement was done. >> >> Since test setup can make a significant difference, here is my test setup: >> >> gumstix Overo Earth >> gumstix Pinto-TH (modified) >> USB to TTL serial cable (FTDI TTL-232R-3V3) >> >> I chose the Pinto-TH because it has the least amount of claptrap. >> (Things like Ethernet and low-power consumption tend to be mutually >> exclusive.) Alas, the Pinto-TH has perhaps too little claptrap, as >> there is no built-in method to easily access the console. >> >> To remedy this, I white-wired the Pinto-TH PCB to use the onboard >> 74x245 to translate the console signals (GPIO165_IR_RXD3 and >> GPIO166_IR_TXD3) to 3.3V. I then used a FTDI TTL-232R-3V3 cable to >> provide a convenient USB serial port connection. >> >> I powered the Pinto-TH with a 6VDC bench supply and measured power >> with a bench multimeter. >> >> All measurements of power consumption are with an idle shell prompt >> and no extra software running. >> >> 768 mW : defacto Sakoman mainline kernel linked to by the Gumstix site >> 750 mW : (saved 18 mW) removal of two LEDs on Pinto-TH board >> 624 mW : (saved 126 mW) switched to bleeding edge Linux OMAP3 PM kernel >> 264 mW : (saved 360 mW) enabled 'sleep while idle' >> 180 mW : (saved 84 mW) forced USB3326 chip into reset via GPIO183 >> 174 mW : (saved 6 mW) turned off blue LED via "GPIO211" and kernel patch >> 168 mW : (saved 6 mW) enabled 'off mode' >> >> It is unclear to me what actions are taken (if any) in the TPS65950 by >> 'sleep_while_idle' and 'off_mode', and given that the Gumstix is a >> black box (no schematic), it is hard to know how the supplies are used >> and what can be safely turned off. Neither of the kernels actually >> ever turn off VDD1, VDD2, for example. Both the Linux OMAP PM and the >> latest mainline Sakoman kernels do something to alter power >> consumption (but it only could be internal to the OMAP3). >> >> 'sleep_while_idle' was enabled with the following: >> >> mkdir /debug >> mount -t debugfs debugfs /debug >> echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout >> echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout >> echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout >> echo 1 > /debug/pm_debug/sleep_while_idle >> >> 'off_mode' was enabled with the following: >> >> mkdir /debug >> mount -t debugfs debugfs /debug >> echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout >> echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout >> echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout >> echo 1 > /debug/pm_debug/sleep_while_idle >> echo 1 > /debug/pm_debug/enable_off_mode >> >> Holding the USB3326 in reset was achieved with the following: >> >> echo 183 > /sys/class/gpio/export >> echo out > /sys/class/gpio/gpio183/direction >> echo 0 > /sys/class/gpio/gpio183/value >> >> Disabling the blue LED (D3) was achieved by patching the kernel (See >> Federico Belvisi's post to this mailing list on 2010-09-21.) and the >> following: >> >> echo 211 > /sys/class/gpio/export >> echo out > /sys/class/gpio/gpio211/direction >> echo 1 > /sys/class/gpio/gpio211/value >> >> ------------------------------------------------------------------------------ >> Nokia and AT&T present the 2010 Calling All Innovators-North America contest >> Create new apps & games for the Nokia N8 for consumers in U.S. and Canada >> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing >> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store >> http://p.sf.net/sfu/nokia-dev2dev >> _______________________________________________ >> gumstix-users mailing list >> [hidden email] >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> > > ------------------------------------------------------------------------------ > Nokia and AT&T present the 2010 Calling All Innovators-North America contest > Create new apps & games for the Nokia N8 for consumers in U.S. and Canada > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > http://p.sf.net/sfu/nokia-dev2dev > _______________________________________________ > gumstix-users mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gumstix-users > ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users |
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I have verified this. This has a huge impact, thanks.
Tyler
On Fri, Sep 24, 2010 at 12:30 PM, Peter Lawrence <[hidden email]> wrote: R. P. McMurphy, thanks for the settings. -- Tyler Gore 617-505-4865(work) 503-860-0743 (cell) -- This email message, including any attachments, is intended solely for the use of the designated recipient(s) and may contain confidential, privileged, and or proprietary information. Any unauthorized review, use, disclosure or distribution is strictly prohibited. ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users |
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In reply to this post by Peter Lawrence-5
Hi Peter,
What version of linux omap pm have you used? I have no problem to build an linux image with the 2.6.29, but I'm haven problem building a recipes for a lasted image (linux-omap-pm_2.6.33.bb or linux-omap-pm_2.6.34.bb). Thanks ----- Original Message ----- From: "Peter Lawrence" <[hidden email]> To: <[hidden email]> Sent: Thursday, September 23, 2010 9:01 PM Subject: [Gumstix-users] sample numbers for Overo Earth power consumption > Like some other Gumstix users, I am struggling to reduce the Gumstix > power consumption to be more in line with other OMAP3 platforms. > > In the hope that it helps others with similar struggles, this > documents what power savings I achieved and how each incremental > improvement was done. > > Since test setup can make a significant difference, here is my test setup: > > gumstix Overo Earth > gumstix Pinto-TH (modified) > USB to TTL serial cable (FTDI TTL-232R-3V3) > > I chose the Pinto-TH because it has the least amount of claptrap. > (Things like Ethernet and low-power consumption tend to be mutually > exclusive.) Alas, the Pinto-TH has perhaps too little claptrap, as > there is no built-in method to easily access the console. > > To remedy this, I white-wired the Pinto-TH PCB to use the onboard > 74x245 to translate the console signals (GPIO165_IR_RXD3 and > GPIO166_IR_TXD3) to 3.3V. I then used a FTDI TTL-232R-3V3 cable to > provide a convenient USB serial port connection. > > I powered the Pinto-TH with a 6VDC bench supply and measured power > with a bench multimeter. > > All measurements of power consumption are with an idle shell prompt > and no extra software running. > > 768 mW : defacto Sakoman mainline kernel linked to by the Gumstix site > 750 mW : (saved 18 mW) removal of two LEDs on Pinto-TH board > 624 mW : (saved 126 mW) switched to bleeding edge Linux OMAP3 PM kernel > 264 mW : (saved 360 mW) enabled 'sleep while idle' > 180 mW : (saved 84 mW) forced USB3326 chip into reset via GPIO183 > 174 mW : (saved 6 mW) turned off blue LED via "GPIO211" and kernel patch > 168 mW : (saved 6 mW) enabled 'off mode' > > It is unclear to me what actions are taken (if any) in the TPS65950 by > 'sleep_while_idle' and 'off_mode', and given that the Gumstix is a > black box (no schematic), it is hard to know how the supplies are used > and what can be safely turned off. Neither of the kernels actually > ever turn off VDD1, VDD2, for example. Both the Linux OMAP PM and the > latest mainline Sakoman kernels do something to alter power > consumption (but it only could be internal to the OMAP3). > > 'sleep_while_idle' was enabled with the following: > > mkdir /debug > mount -t debugfs debugfs /debug > echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout > echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout > echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout > echo 1 > /debug/pm_debug/sleep_while_idle > > 'off_mode' was enabled with the following: > > mkdir /debug > mount -t debugfs debugfs /debug > echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout > echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout > echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout > echo 1 > /debug/pm_debug/sleep_while_idle > echo 1 > /debug/pm_debug/enable_off_mode > > Holding the USB3326 in reset was achieved with the following: > > echo 183 > /sys/class/gpio/export > echo out > /sys/class/gpio/gpio183/direction > echo 0 > /sys/class/gpio/gpio183/value > > Disabling the blue LED (D3) was achieved by patching the kernel (See > Federico Belvisi's post to this mailing list on 2010-09-21.) and the > following: > > echo 211 > /sys/class/gpio/export > echo out > /sys/class/gpio/gpio211/direction > echo 1 > /sys/class/gpio/gpio211/value > > ------------------------------------------------------------------------------ > Nokia and AT&T present the 2010 Calling All Innovators-North America > contest > Create new apps & games for the Nokia N8 for consumers in U.S. and Canada > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in > marketing > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > http://p.sf.net/sfu/nokia-dev2dev > _______________________________________________ > gumstix-users mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gumstix-users ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today. http://p.sf.net/sfu/beautyoftheweb _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users |
Re: sample numbers for Overo Earth power consumption
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This is a work in progress for me, but what follows are my current instructions.
Your mileage may vary; do this at your own risk. What is missing from the instructions is the right patch to .config to enable access to the NAND flash and SD card. Such a change is needed if you want to use the official Gumstix/Sakoman filesystem. This has been a non-issue for my application, as I want a RAM filesystem so that the system can be turned on and off without doing a special shutdown. -- I don't want to start a flame war, but I find the OpenEmbedded / BitBake approach wholly lacking. So, I've been building the kernel the traditional way. 1) Download and install cross-compiler tools: The easiest solution is to download the CodeSourcery binaries: http://www.codesourcery.com/sgpp/lite/arm CodeSourcery provides an install program. (You'll have to set the executable bit on the file to run it.) Note that the CodeSourcery install modifies .bash_profile to add the path, but this file does not run automatically in Ubuntu. To fix this, refer to: http://www.linuxquestions.org/questions/linux-general-1/do-i-put-path-in-bash_profile-or-bashrc-or-both-540288/ which says: "You can change the second by opening a gnome-terminal window and going to Edit / Profiles - select the Default profile and click the Edit button. On the Title and Command tab, click the check box for Run command as a login shell. Your .bash_profile file should be sourced the next time you open a gnome-terminal." 2) Get latest Linux OMAP PM code "git" the latest code: git clone git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm.git The result will be in the subdirectory "linux-omap-pm". 3) Build the OMAP3_PM Linux Kernel Extract the download Linux kernel code and cd to that directory. The command sequence is: export ARCH=arm make omap3_pm_defconfig This creates a .config file suitable for Linux OMAP3 PM. TBD: patch the .config file for JFFS2 and SD card export CROSS_COMPILE=arm-none-eabi- make uImage [this takes a very long while] The resultant kernel file will be in: ./arch/arm/boot/uImage 4) Download the initramfs filesystem Obtain "rd-ext2-8M.bin" from: http://code.google.com/p/beagleboard/downloads/list 5) Create a bootable MicroSD card Follow the instructions here: http://www.gumstix.net/Setup-and-Programming/view/Overo-Setup-and-Programming/Creating-a-bootable-microSD-card/111.html However, one can omit the "MLO" and the "u-boot.bin" files. One should, however, copy over the "uImage" file created in step #3, and the "rd-ext2-8M.bin" (as "rd-ext2.bin") created in step #4. 6) Boot the Overo Use the "Press any key" prompt at boot to operate the U-Boot app. Enter the following commands: (alas, they must be done individually, as U-Boot does not have a large enough buffer for the entire quantity to be pasted at once) mmc init fatload mmc 1:1 0x80300000 uImage.pm fatload mmc 1:1 0x81600000 rd-ext2.bin setenv bootargs console=ttyS2,115200n8 ramdisk_size=8192 root=/dev/ram0 rw rootfstype=ext2 initrd=0x81600000,8M bootm 0x80300000 TBD: change u-boot parameters to perform this automatically Linux should boot, and one should be presented with a BusyBox console prompt. On Tue, Oct 5, 2010 at 4:51 AM, Victor Andres <[hidden email]> wrote: > Hi Peter, > What version of linux omap pm have you used? > I have no problem to build an linux image with the 2.6.29, but I'm haven > problem building a recipes for a lasted image (linux-omap-pm_2.6.33.bb or > linux-omap-pm_2.6.34.bb). > > Thanks > > > > ----- Original Message ----- > From: "Peter Lawrence" <[hidden email]> > To: <[hidden email]> > Sent: Thursday, September 23, 2010 9:01 PM > Subject: [Gumstix-users] sample numbers for Overo Earth power consumption > > >> Like some other Gumstix users, I am struggling to reduce the Gumstix >> power consumption to be more in line with other OMAP3 platforms. >> >> In the hope that it helps others with similar struggles, this >> documents what power savings I achieved and how each incremental >> improvement was done. >> >> Since test setup can make a significant difference, here is my test setup: >> >> gumstix Overo Earth >> gumstix Pinto-TH (modified) >> USB to TTL serial cable (FTDI TTL-232R-3V3) >> >> I chose the Pinto-TH because it has the least amount of claptrap. >> (Things like Ethernet and low-power consumption tend to be mutually >> exclusive.) Alas, the Pinto-TH has perhaps too little claptrap, as >> there is no built-in method to easily access the console. >> >> To remedy this, I white-wired the Pinto-TH PCB to use the onboard >> 74x245 to translate the console signals (GPIO165_IR_RXD3 and >> GPIO166_IR_TXD3) to 3.3V. I then used a FTDI TTL-232R-3V3 cable to >> provide a convenient USB serial port connection. >> >> I powered the Pinto-TH with a 6VDC bench supply and measured power >> with a bench multimeter. >> >> All measurements of power consumption are with an idle shell prompt >> and no extra software running. >> >> 768 mW : defacto Sakoman mainline kernel linked to by the Gumstix site >> 750 mW : (saved 18 mW) removal of two LEDs on Pinto-TH board >> 624 mW : (saved 126 mW) switched to bleeding edge Linux OMAP3 PM kernel >> 264 mW : (saved 360 mW) enabled 'sleep while idle' >> 180 mW : (saved 84 mW) forced USB3326 chip into reset via GPIO183 >> 174 mW : (saved 6 mW) turned off blue LED via "GPIO211" and kernel patch >> 168 mW : (saved 6 mW) enabled 'off mode' >> >> It is unclear to me what actions are taken (if any) in the TPS65950 by >> 'sleep_while_idle' and 'off_mode', and given that the Gumstix is a >> black box (no schematic), it is hard to know how the supplies are used >> and what can be safely turned off. Neither of the kernels actually >> ever turn off VDD1, VDD2, for example. Both the Linux OMAP PM and the >> latest mainline Sakoman kernels do something to alter power >> consumption (but it only could be internal to the OMAP3). >> >> 'sleep_while_idle' was enabled with the following: >> >> mkdir /debug >> mount -t debugfs debugfs /debug >> echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout >> echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout >> echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout >> echo 1 > /debug/pm_debug/sleep_while_idle >> >> 'off_mode' was enabled with the following: >> >> mkdir /debug >> mount -t debugfs debugfs /debug >> echo 5 > /sys/devices/platform/serial8250.0/sleep_timeout >> echo 5 > /sys/devices/platform/serial8250.1/sleep_timeout >> echo 5 > /sys/devices/platform/serial8250.2/sleep_timeout >> echo 1 > /debug/pm_debug/sleep_while_idle >> echo 1 > /debug/pm_debug/enable_off_mode >> >> Holding the USB3326 in reset was achieved with the following: >> >> echo 183 > /sys/class/gpio/export >> echo out > /sys/class/gpio/gpio183/direction >> echo 0 > /sys/class/gpio/gpio183/value >> >> Disabling the blue LED (D3) was achieved by patching the kernel (See >> Federico Belvisi's post to this mailing list on 2010-09-21.) and the >> following: >> >> echo 211 > /sys/class/gpio/export >> echo out > /sys/class/gpio/gpio211/direction >> echo 1 > /sys/class/gpio/gpio211/value >> >> ------------------------------------------------------------------------------ >> Nokia and AT&T present the 2010 Calling All Innovators-North America >> contest >> Create new apps & games for the Nokia N8 for consumers in U.S. and Canada >> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in >> marketing >> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store >> http://p.sf.net/sfu/nokia-dev2dev >> _______________________________________________ >> gumstix-users mailing list >> [hidden email] >> https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > ------------------------------------------------------------------------------ > Beautiful is writing same markup. Internet Explorer 9 supports > standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. > Spend less time writing and rewriting code and more time creating great > experiences on the web. Be a part of the beta today. > http://p.sf.net/sfu/beautyoftheweb > _______________________________________________ > gumstix-users mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gumstix-users > ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today. http://p.sf.net/sfu/beautyoftheweb _______________________________________________ gumstix-users mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gumstix-users |
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