Le jeu. 30 mars 2023 à 23:54, Brian Sammon < debian-arm-l...@brisammon.fastmail.fm> a écrit :
> I currently have a Lenovo Duet 5 chromebook (with ARM processor) that runs > debian off an SD Card via USB. > > > The problem is that instead of a normal BIOS or UEFI, thelaptop has the > > nasty ChromeOS bootloader which refuses to boot the normal Debian ARM64 > > Netinst installer. The only thing it wants to boot from USB is the > > ChromeOS recovery. > > hexbuilder's VelvetOS (a (slightly?) modified version of Debian) builds > might boot from USB--that's what I'm using. > Check out > https://github.com/hexdump0815/imagebuilder/blob/main/systems/chromebook_oak/readme.md > > > In theory, I could boot into ChromeOS from the eMMC, login as root and > > copy Debian from the stick to the eMMC, but I don’t know how to > > partition the eMMC. Where does the nasty bootloader expect to find > > things? Can I make it boot into GRUB, or do I have to put the Linux > > kernel from Debian onto a special partition? I’m completely clueless. > > The process seems to be: > 1) compress the kernel image with lz4 > 2) create a FIT image with mkimage > (mkimage is found in the "u-boot-tools" package in debian) > 3) sign the FIT image and add the kernel commandline with vbutil_kernel > (vbutil_kernel is found in the "vboot-kernel-utils" package in debian) > 4) dd the signed image to one of a "Kernel" partition > 5) use cgpt to set the relevant flags that mark the chosen Kernel > partition as bootable/preferred. > (there's a "cgpt" package in debian) > > The documentation for this (and the individual tools) is a bit suboptimal > and scattered, so I don't have any documentation pointers--I extracted this > process from the build scripts for hexbuilder's VelvetOS images. > I haven't gotten to the point of understanding if/why all these steps are > actually necessary, but I've used this process successfully to customize > the install and partition table on the SD card I'm using on my Chromebook. > I suspect that a similar process could be applied to the internal storage > of a Chromebook, but I haven't explored that yet. > Alper Nebi Yasak was working on making it easier to do all that in debian, you might find interesting things at https://salsa.debian.org/alpernebbi I know depthcharge-tools is in debian and is working (i'm using it on c201 chromebooks). However I don't know if it's possible to install debian the usual way right now. I had luck with https://github.com/SolidHal/PrawnOS - just to install a base os, then I switched to debian sources. Jérémy
