These are just my notes, and described process worked for me on my 1C robot
If anything goes wrong, having USB adapter for FEL flashing might be the only way to restore your robot
this is not an official guide
oh, and I'm not responsible for any damage blah blah
and huge thanks to Dennis and Hypfer, and everyone behind this root :)
to enter uboot shell on 1C you have to: 0. turn robot off normally
- hook up uart, open console
- press any button and keep holding it
- hold HOME button for 3+ seconds (dont release it yet)
- hold POWER button for 3+ seconds while still holding HOME
- you should be in uboot shell – release both buttons
see dennis' uart slides for more info
notice: step 3 (home button) seems missing in those slides, maybe different vacuums have differences :)
note (thanks, @Hypher):
there is also boot_partition boot2, and setting boot_partition to boot1 when it's corrupted and boot2 is being used might cause trouble.
so try to boot without setting boot_partition first, and only if it doesn't work, try again with boot_partition set.
I'll try to test if boot_partition needs to be set at all, if it's persisted without saveend, and what would be the proper way to set it when I have free time for it.
setenv init /bin/sh
# setenv boot_partition boot1
bootyou have to act quickly before watchdog (or whatever it is) reboots the device
wait for shell – you'll see # /
following commands worked for 1c, might be different for other robots
for ideas on how to get uart shell look at dustbuilder diff to see what exactly it changes to start shell on uart
mount /tmp
mkdir /tmp/fakeetc
cp -R /etc/* /tmp/fakeetc
mount --bind /tmp/fakeetc /etc
echo >> /tmp/fakeetc/inittab
echo '::respawn:-/bin/sh' >> /tmp/fakeetc/inittab
exec initnormal boot should continue, except there will be shell after boot on uart
it's not supposed to reboot, it should keep booting normally in userspace
wait for new shell to pop up - wait for # / again
mkdir /tmp/backup
tar -cvzf /tmp/backup/misc.tgz -C /mnt/misc .
tar -cvzf /tmp/backup/uli_factory.tgz -C /mnt/private/ULI/factory/ .
cd /tmp/backupnow grab misc.tgz and uli_factory.tgz somehow i.e. by starting upload server and using curl i've used github.com/mayth/go-simple-upload-server dont forget to
rm -rf /tmp/backupbuild a custom firmware for manual install method on dustbuilder and follow howto from there
for example, for 1c this should work:
cd /tmp
wget {url-of-firmware.tar.gz}
tar -xzvf {name-of-firmware.tar.gz}
./install.shif patched firmware was flashed, you'll get a root shell on uart after boot without doing anything
Hello, I was able to get to the uboot once but I couldn't run the last command, and now everytime I try to stop at the sunxi line it just freezes there and I'm force to continue with normal booting. Am I doing something wrong? I'm pressing S, then Home and then Power. I keep all pressed.