image update guide about norns-image HOT 5 CLOSED

tried bumping up the cairotest service up the queue using DefaultDependencies=no, managed to soft-brick the device!

So it'd be quite handy to get those instructions on usb-disk-mode...

another stupid question - anyone know how to manually remove the cairotest service once my laptop manages to mount the eMMC root partition?

from norns-image.

from norns-image.

@ranch-verdin here it is!

this needs to be put into the repo, i'll do that later.

to open the cm3's emmc in usb disk mode:

• plug the usb boot in, connect to laptop (linux)
• change the power stay-on switch to the left (ON)
• power up the device by plugging in USB power (if the battery is unattached, otherwise it'll power-on when you change the switch)

software

https://www.raspberrypi.org/documentation/hardware/computemodule/cm-emmc-flashing.md

summary:

sudo apt-get install libusb-1.0-0-dev
git clone --depth=1 https://github.com/raspberrypi/usbboot
cd usbboot
make
sudo ./rpiboot

you'll then get a new disk in /dev/sd?

you can go modify the files of your emmc then, to fix the boot process.

the instructions are also there to do a full disk write, but i don't have a disk image online that i'd suggest using at the moment-- also no need to start over, just fix your error to get it booting.

from norns-image.

appending systemd.unit=rescue.target to /boot/cmdline.txt got me out of trouble this time.

as a sidenote, sudo sulogin is broken on this install. We should fix it because systemd fails when trying to execute this command for systemd.unit=rescue.target & systemd.unit=emergency.target

Only managed to get out of trouble because systemd somehow went around the faulty service after failing to give a root shell

EDIT: sudo sulogin can be fixed by setting the root password:

sudo su
passwd

also here is an informative link for systemd recovery https://freedesktop.org/wiki/Software/systemd/Debugging/

from norns-image.

https://github.com/tehn/norns-image/blob/master/readme-usbdisk.md

from norns-image.