Re: chainload to another grub2

[Pascal Hambourg]

Le 08/03/2019 à 14:24, lejeczek a écrit :
> How would I chain to another grub(on an NVMe) ?

First, the BIOS/UEFI firmware must have NMVe support, either natively or 
via a BIOS ROM extension.

> I'm trying something this simple:
>
> insmod chain
> drivemap -s hd0 hd1
> chainloader (hd1)+

Why do you swap (hd0) and (hd1) ? GRUB does not need it. Also, 
chainloading (hd1) after that means chainloading the original (hd0).

> but I get:
>
> "error: invalid signature.
> Press any key...."

It seems that the MBR does not contain the boot signature (the aa 55 
bytes at the end). Or this is GRUB for EFI (check environment variables 
with the "set" command) which expects an EFI executable file as the 
chainloader argument instead of a boot sector.