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keep_uboot.md

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Boot Debian keeping original U-Boot

Deboostrap debian

docker-compose run deboot ./deboot_keepuboot.sh armel squeeze http://archive.debian.org/debian/

For Debugging/Testing:

docker-compose run deboot bash
./deboot_keepuboot.sh armel buster http://ftp.fr.debian.org/debian/ openssh-server

Get USB key ready

Format to ext2

# Optionnal, recreate MBR partition
sudo apt-get install mbr
sudo install-mbr /dev/sda

# Create and formate axt2 partition
# echo ";" | sudo sfdisk /dev/sda
sudo parted -l
sudo parted /dev/sda rm 1
sudo parted /dev/sda mklabel msdos
sudo parted -a optimal /dev/sda mkpart primary 0% 100%
#sudo parted -a minimal /dev/sda mkpart primary 0% 100%
sudo parted /dev/sda set 1 boot on

sudo mkfs.ext2 /dev/sda1

# Optionnal, chek bad blocks and fix it
sudo badblocks -s -w -t 0 /dev/sda1 > badsectors.txt
sudo e2fsck -y -l badsectors.txt /dev/sda1

Extract Debian

sudo mkdir -p /mnt/usb/
sudo mount /dev/sda1 /mnt/usb/
sudo tar xzf ~/buster-armel.final.tar.gz -C /mnt/usb/
ls -la /mnt/usb/
sudo umount /mnt/usb/

Only boot files (Not working...):

sudo tar xzf ~/buster-armel.final.tar.gz -C /mnt/usb/ boot

Serial boot

screen -L /dev/ttyUSB0 115200

At the Hit any key to stop autoboot prompt, press space then 1 (can be done before). You should see u-boot prompt:

Marvel>>

First, keep current u-boot parameters:

printenv

Keep the content of printenv output. This will be a useful reference if you want to restore any u-boot parameters.

setenv ethaddr 14:D6:4D:AB:A7:12
setenv usbbootargs_root root=/dev/disk/by-path/platform-f1050000.ehci-usb-0:1:1.0-scsi-0:0:0:0-part1 rw
setenv mtdparts mtdparts=orion_nand:1M(u-boot),5M(uImage),5M(ramdisk),102M(image),10M(mini_firmware),-(config)
setenv bootargs console=ttyS0,115200 initramfs.runsize=32M usb-storage.delay_use=0 rootdelay=1 panic=5 ${usbbootargs_root} ${mtdparts} cmdlinepart.${mtdparts}
# setenv bootargs console=ttyS0,115200 initramfs.runsize=32M usb-storage.delay_use=0 rootdelay=1 panic=5 ${usbbootargs_root}
setenv bootcmd 'usb start;ext2load usb 0:1 0xa00000 /boot/uImage;ext2load usb 0:1 0xf00000 /boot/uInitrd;bootm 0xa00000 0xf00000'
boot

If booting is ok, re-run all setenv commands above, re-check values, then persist:

printenv ethaddr usbbootargs_root mtdparts cmdlinepart.mtdparts bootargs bootcmd
saveenv
reset

Note:

USB boot root works with usbbootargs_root root=/dev/sda1 rw if no disks.
With disks it's not sure usb key will be affected to sda.
Use full path to be sure.

initramfs.runsize 10% by default, fit it to 32M
The mtdparts option had became cmdlinepart.mtdparts (in Debian-land, at least). StackExchange

panic=Y reboot on kernel panic. Happen when usb storage is not detected and default kernel is booted.

Debug USB disk

usb start
usb info
usb part
ext2ls usb 0:1

To try another USB Key, restart:

reset

Source: https://github.com/ValCher1961/McDebian_WRT3200ACM/wiki/%23-Using-external-drives-in-U-Boot

Rollback

setenv bootargs 'root=/dev/ram console=ttyS0,115200 :::DB88FXX81:egiga0:none'
setenv bootcmd 'nand read.e 0xa00000 0x100000 0x300000;nand read.e 0xf00000 0x600000 0x300000;bootm 0xa00000 0xf00000'