Using Debian Community Filesystem

Guide to convert existing debian sd card to boot on MTK

This guide was done using the following image:
This image used kernel tag 4.4.30-ti-rt-r64 and so attached device tree was built for this kernel. It will likely only need minor modifications to work with similar 4.4 kernels.

  • Update u-boot
    • Build CL u-boot with mityarm335x_maker defconfig.
      U-Boot 2013.10-00069-gf9dd46dead39
    • The newer debian images have u-boot installed directly in block device, not in seperate boot partition. So we need to use dd to update it.
      sudo dd if=MLO of=/dev/sdi count=1 seek=1 conv=notrunc bs=128k
      sudo dd if=u-boot.img of=/dev/sdi count=2 seek=1 conv=notrunc bs=384k
    • The older debian images with the seperate boot partition should be easier to update by replacing the MLO/u-boot.img file in the boot partition.
  • Modify /boot/uEnv.txt file
    • Specify the maker board dtb file
    • Alternative: The bonegreen dtb can be used to get a booting device, but ethernet and cape detection won't work. Likely other things as well.
    • Add rootfs type as this variable is missing in our u-boot
      mmcrootfstype=ext4 rootwait
  • Copy dtb file to sd card /boot/dtbs/4.4.30-ti-r64/
  • Boot device
  • Optional: To shut down lightdm gui and free up memory.
    root@beaglebone:~# systemctl stop lightdm.service
  • Flash board eeprom to get cape manager to work
    root@beaglebone:~# dd if=/opt/scripts/device/bone/bbb-eeprom.dump of=/sys/bus/i2c/devices/0-0050/eeprom
    root@beaglebone:~# hexdump -e '8/1 "%c"' /sys/bus/i2c/devices/0-0050/eeprom
  • Reboot

Using a BB-BONE-LCD7-01-00A3.dts compatible cape

  • Copy dtb overlay file to sd card /boot/dtbs/4.4.30-ti-r64/
    Created a "-overlay" device tree which disables spi, hdmi, and audio as they conflict with the LCD cape overlay. This was based off the differences between am335x-boneblack.dts and am335x-boneblack-overlay.dts.
  • Update /boot/uEnv.txt to use overlay dtb
  • Boot
  • Verify cape manager found LCD
    root@beaglebone:~# dmesg | grep bone_capemgr
    [    3.730507] bone_capemgr bone_capemgr: Baseboard: 'A335BNLT,\xffffffff\xffffffff\xffffffff\xffffffff,\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff'
    [    3.737956] bone_capemgr bone_capemgr: compatible-baseboard=ti,beaglebone-black - #slots=4
    [    3.752557] bone_capemgr bone_capemgr: slot #0: '4D 7.0 LCD CAPE- 4DCAPE-70T     ,00A3,4D SYSTEMS      ,BB-BONE-LCD7-01'
    [    3.802226] bone_capemgr bone_capemgr: slot #1: No cape found
    [    3.846228] bone_capemgr bone_capemgr: slot #2: No cape found
    [    3.890227] bone_capemgr bone_capemgr: slot #3: No cape found
    [    3.896370] bone_capemgr bone_capemgr: initialized OK.
    [    3.939085] bone_capemgr bone_capemgr: slot #0: dtbo 'BB-BONE-LCD7-01-00A3.dtbo' loaded; overlay id #0

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