Boot loader arguments (was: ZFS support for EFI)

[Ganael Laplanche]

Hi Eric,

I am replying to this -quite old now- post :

https://lists.freebsd.org/pipermail/freebsd-hackers/2015-March/047486.html

> More importantly, the EFI loader doesn't seem to make use of its
> command-line arguments at all.  But a ZFS-enabled loader would really
> need the ability to take arguments from boot1 (or grub, or whatever
> else).

where you were suggesting it would be interesting for the EFI loader to make 
use of its arguments, which is still not the case.

We've faced a similar problem here, where we needed the EFI loader be able to 
locally override the root-path offered through BOOTP. A quick fix would have 
been to hardcode the root-path but instead we chose to pass it through an 
argument to the loader (which then sets a new environment variable : 
dhcp.root-path.override).

Find attached the two -simple- patches that allow such an operation. I don't 
know if they can be interesting for you or for upstream inclusion (though they 
are probably *not* ready for direct inclusion yet).

Best regards,

-- 
Ganaël LAPLANCHE <ganael.laplanche at corp.ovh.com>