Re: Chainloading on a LibreBoot X200

[Pascal Hambourg]

Disclaimer : I don't know nor use Libreboot/Coreboot.

Le 28/05/2018 à 03:09, Eduardo Ochs a écrit :
> I have a LibreBoot X200 - with its Grub in flash memory updated to the
> version from 20160907 - and I am not being able to make it boot a
> bootable pen drive by chainloading. Let me tell the whole story.
(...)
> The pen drive boots fine in my neighbor's computer, but when I try to
> make the grub from flash memory boot it by doing something like this
> (note: I tried several devices),
>
>    set root=(usb0)
>    chainloader +1
>    boot
>
> I get the error "unrecognised payload type"...

I guess the pendrive is set up to be booted from BIOS (or UEFI) ?
AFAIK BIOS chainloading works only if BIOS services are available.
Do Libreboot provide BIOS services and can its GRUB payload use them ?
The device names you use such (usb0) and (ahci0) indicate that GRUB uses 
native (or coreboot ?) drivers, not BIOS drivers which would give names 
such as (hd0).

> and I also tried to install a more recent grub in
> /dev/sda6 and chainload to it; grub is version
> "2.02~beta2-9ubuntu1.14+7.0trisquel5" here, and /dev/sda6 is my root
> partition nowadays (it is ext4). I tried this,
(...)
>    sudo grub-install -v --force /dev/sda6
>
> and checked the installation with bootinfoscript, who said:
>
>    sda6: __________________________________________
>
>      File system:       ext4
>      Boot sector type:  Grub2 (v1.99)
>      Boot sector info:  Grub2 (v1.99) is installed in the boot sector of
> sda6
>                         and looks at sector 102116496 of the same hard drive
>                         for core.img. core.img is at this location and looks
>                         in partition 112 for .
>      Operating System:  Trisquel GNU/Linux 7.0
>      Boot files:        /boot/grub/grub.cfg /etc/fstab
>
> but when I try to chainload from the grub from flash memory to
> /dev/sda6 by doing something like this,
>
>    insmod chain
>    insmod ntfs
>    insmod ext2
>    set root=(ahci0,6)
>    chainloader +1
>    boot
>
> I also get the error "unrecognised payload type", plus "you need to
> load the kernel first"...

I guess this is grub-pc (for BIOS) too ?
Maybe you need to use grub-coreboot ?
How do yo boot the main OS from Libreboot/GRUB payload ?