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gsitreble2019/chromeosflex.md

Created August 8, 2022 16:46
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Disable rootfs verification chromeosflex
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chromeosflex.md

Enabled developer mode on ChromeOSFlex

Mount the flex SSD in a linux device (or USB boot). Identify the EFI partition

sudo fdisk -l to identify the EFI System partition which in my case was /dev/sdb12

Edit file grub.cfg and add cros_debug to the various options

Saved the grub.cfg file

For meltdown/spectre add kvm-intel.vmentry_l1d_flush=always to the kernel command line the same way you added cros_debug to enable some software mitigations.

Chromebook writable root

First make sure your machine is set to developer mode and then reboot to apply any pending updates.

Execute the following to remove the root FS verification:

sudo /usr/share/vboot/bin/make_dev_ssd.sh --remove_rootfs_verification

The command will fail with a warning and tell you to run the same command with --partitions 4 flag at the end where 4 can be any number. Run the command again with the new flag.

Then set the following variable:

sudo crossystem dev_boot_signed_only=0

Then remount your root FS with:

sudo mount -o remount,rw /

References:

https://www.reddit.com/r/ChromeOSFlex/comments/swxlz8/tutorial_enable_developer_mode_on_cros

https://www.reddit.com/r/chromeos/comments/stl9fq/enabled_developer_mode_on_chromeos_flex_by/

https://old.reddit.com/r/ChromeOSFlex/comments/w3ehw7/fixing_audio_on_bay_trail_chromebooks/

https://xn--1ca.se/chromebook-writable-root/

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