linux - Using GPIO-Poweroff on a Raspberry Pi Compute Module with DAS U-Boot to turn off the PSU -


i've been trying gpio-poweroff switch off board psu using gpio no matter try, never seems work. if manually toggle gpio pin, device shuts down. if take stock raspbian-lite , add following line config.txt works. u-boot seems ignoring it. using raspbian lite 2017-07-5 latest mainline u-boot: git://git.denx.de/u-boot.git compiled rpi_defconfig.

dtoverlay=gpio-poweroff,gpiopin=6,active_low=1

with u-boot raspberry pi boots , works normally, shuts down never toggles gpio6. leaves psu running , way fix holding down power button @ least 5 seconds. know dt-blob.bin loaded , applied board has camera works correct dt-blob.bin.

at point out of ideas. have tried:

  • updating linux kernel using rpi-update
  • decompiling both gpio-poweroff.dtbo , dt-blob.bin. changing 0x1a 0x06 , 0x0 0x1 inside gpio -poweroff.dtbo, concatenating them , doesn't work.
  • manually doing above , intertwining decompiled code.
  • using fdt addr, , fdt apply inside boot.scr apply manually, didn't work because fdt_overlay_apply fdt_err_nospace , couldn't seem past this.
  • cloning linux , trying make dtsb, target doesn't exist.
  • cloning linux/arch/arm/boot/dts, writing makefile , compiling them changes results in u-boot loading, raspbian loading gpio-poweroff not working.
  • other attempts barely worth mentioning.

nothing try seems work, , i'm not sure go forward.

for reference, here of files in use:

boot.cmd:

#setting default bootargs setenv original_bootargs console=ttys0 console=tty1 rootfstype=ext4 fsck.repair=yes hdmi.audio=0 disp.screen0_output_mode=1920x1080p60:1280x720p60:800x600p60:edid rootwait panic=10 # console must ttys0 or not boot!  # identify if using partition 2 or 3 if fatload mmc 0:1 ${loadaddr} swap; echo "using partition 3"; setenv partition 3; else echo "using partition 2"; setenv partition 2; fi  # check recovery if fatload mmc 0:1 ${loadaddr} recovery; echo "using recovery partition"; setenv partition 4; fi #if gpio input 32 || fatload mmc 0:1 ${loadaddr} recovery; echo "using recovery partition"; setenv partition 4; fi  # create empty file detect boot failures fatwrite mmc 0:1 ${kernel_addr_r} recovery 0  # set bootargs setenv bootargs "${original_bootargs} root=/dev/mmcblk0p${partition}"  # load existing linux kernel ram echo loading partition ${partition} ext4load mmc 0:${partition} ${kernel_addr_r} kernel.img # boot kernel have loaded bootz ${kernel_addr_r} - ${fdt_addr}

not sure why, boots red , blue swapped, , @ low resolution. compiled mkimage -a arm -o linux -t script -c none -a 0x00000000 -e 0x00000000 -n "boot script" -d boot.cmd boot.scr

config.txt:

# more options , information see # http://rpf.io/configtxt # settings may impact device functionality. see link above details  # uncomment if no picture on hdmi default "safe" mode #hdmi_safe=1  # uncomment if display has black border of unused pixels visible # , display can output without overscan disable_overscan=1  # uncomment following adjust overscan. use positive numbers if console # goes off screen, , negative if there border #overscan_left=16 #overscan_right=16 #overscan_top=16 #overscan_bottom=16  # uncomment force console size. default display's size minus # overscan. #framebuffer_width=1280 #framebuffer_height=720  # uncomment if hdmi display not detected , composite being output #hdmi_force_hotplug=1  # uncomment force specific hdmi mode (this force vga) #hdmi_group=1 #hdmi_mode=1  # uncomment force hdmi mode rather dvi. can make audio work in # dmt (computer monitor) modes #hdmi_drive=2  # uncomment increase signal hdmi, if have interference, blanking, or # no display #config_hdmi_boost=4  # uncomment composite pal #sdtv_mode=2  #uncomment overclock arm. 700 mhz default. #arm_freq=800  # uncomment or of these enable optional hardware interfaces dtparam=i2c_arm=on #dtparam=i2s=on #dtparam=spi=on  # uncomment enable lirc-rpi module #dtoverlay=lirc-rpi  # additional overlays , parameters documented /boot/overlays/readme  # enable audio (loads snd_bcm2835) #dtparam=audio=on  gpu_mem=128  start_x=1  dtoverlay=gpio-poweroff,gpiopin=6,active_low=1  dtdebug=1

so, i've fixed compiling own bcm27***.dtb files following concatenated after original content:

/ {     compatible = "brcm,bcm2709";     power_ctrl: power_ctrl {        compatible = "gpio-poweroff";        gpios = <&gpio 6 1>;    }; };

however, has broken gpio , i2c. isn't complete solution. next step restore original files, , try adding end of dt-blob.bin


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