Troubleshooting:boot:initfshooks

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Here are various hooks that might help with initramfs debugging. They are raw pastes and need to be adjusted before using them. Boot a known working ROM to extract the right /sys paths etc.

General usage

  • pmbootstrap install
  • save the hook in the device chroot:
$ pmbootstrap chroot -r
$ apk add nano
$ export TERM=xterm
$ nano /etc/postmarketos-mkinitfs/hooks/my-debug-hook.sh
  • pmbootstrap initfs to regenerate the initramfs
  • pmbootstrap flasher boot

Blinking LED (simple)

#!/bin/sh
while true; do
	echo 255 > /sys/devices/i2c-0/0-0066/leds/blue/brightness
	sleep 1
	echo 0 > /sys/devices/i2c-0/0-0066/leds/blue/brightness
done

Blinking LED (with hotplugging)

#!/bin/sh

# set usb settings
write /sys/class/android_usb/android0/enable 0
sleep 1
write /sys/class/android_usb/android0/f_rndis/ethaddr 00:01:02:03:04:05
write /sys/class/android_usb/android0/iManufacturer samsung
write /sys/class/android_usb/android0/iProduct i9070
write /sys/class/android_usb/android0/iSerial 123456789
write /sys/class/android_usb/android0/enable 1
sleep 1


cat > /bin/hotplug.sh << EOF
#!/bin/sh

if [ "\${SUBSYSTEM}" = "android_usb" ]; then

    if [ "\${USB_STATE}" = "CONNECTED" ]; then
        echo 255 > /sys/devices/platform/i2c-gpio.5/i2c-5/5-0020/leds/button-backlight/brightness
    fi
    if [ "\${USB_STATE}" = "DISCONNECTED" ]; then
        echo 0 > /sys/devices/platform/i2c-gpio.5/i2c-5/5-0020/leds/button-backlight/brightness
    fi

    sleep 5

    echo 255 > /sys/devices/platform/i2c-gpio.5/i2c-5/5-0020/leds/button-backlight/brightness
    sleep 1
    echo 0 > /sys/devices/platform/i2c-gpio.5/i2c-5/5-0020/leds/button-backlight/brightness
    sleep 1
    echo 255 > /sys/devices/platform/i2c-gpio.5/i2c-5/5-0020/leds/button-backlight/brightness
    sleep 1
    echo 0 > /sys/devices/platform/i2c-gpio.5/i2c-5/5-0020/leds/button-backlight/brightness
    sleep 1
    echo 255 > /sys/devices/platform/i2c-gpio.5/i2c-5/5-0020/leds/button-backlight/brightness
    sleep 1
    echo 0 > /sys/devices/platform/i2c-gpio.5/i2c-5/5-0020/leds/button-backlight/brightness
fi
EOF

chmod +x /bin/hotplug.sh
echo "/bin/hotplug.sh" > /proc/sys/kernel/hotplug

Dump sysfs to SD card

You will probably need to adjust the path to the sd card, check the device name from a working OS on the phone - if the kernel is roughly the same, then the device path to the SD card should be the same as well. For Android devices, you could use TWRP for example.

#!/bin/sh
. ./init_functions.sh

setup_usb_network
start_udhcpd

TELNET_PORT=24
telnetd -b "${IP}:${TELNET_PORT}" -l /bin/sh



mkdir -p /sdcard
mount /dev/mmcblk0p1 /sdcard

if [ -e /sdcard/drebrez ]; then
    echo 255 > /sys/devices/i2c-0/0-0066/leds/blue/brightness
fi


walk() {
    for file in $(ls $1); do
        path="$1/$file"
        if test -L "$path"; then
            continue
        fi
        if test -f "$path"; then
            echo "$path"
            cat "$path"
        fi
        if test -d "$path"; then
            walk "$path"
        fi
    done
    cat /proc/cpuinfo
    cat /proc/cmdline
}

walk /sys/devices/ > /sdcard/sysdump2.txt

cat /pmOS_init.log > /sdcard/pmOS_init2.log

show_splash /splash2.ppm.gz

while true; do
    echo 255 > /sys/devices/i2c-0/0-0066/leds/blue/brightness
    sleep 1
    echo 0 > /sys/devices/i2c-0/0-0066/leds/blue/brightness
    echo 255 > /sys/devices/i2c-0/0-0066/leds/amber/brightness
    sleep 1
    echo 0 > /sys/devices/i2c-0/0-0066/leds/amber/brightness
    echo 255 > /sys/devices/i2c-0/0-0066/leds/green/brightness
    sleep 1
    echo 0 > /sys/devices/i2c-0/0-0066/leds/green/brightness
done