On 08.05.2012 21:35, Eric McCorkle wrote: > I'd also like to start a discussion on the matter, since it seems > there are several ways that this could be done. Also, I know Rui > Paulo was working on this a while back. If anyone knows the approach > he was taking, that would be helpful. The way IA-64 handles booting > might also be helpful.
I hope Rui and Marcel can share their experience. > * An EFI boot service could potentially function similarly to > [zfs]loader. Alternatively, it could function like gpt[zfs]boot, > though this might require modifying loader(8) since EFI boot services > run in protected/long mode, and have different system information > table formats. > > * How much of what EFI provides do we want to use? There are > advantages and disadvantages both ways. My thoughts on how this should work: Our EFI loader should be placed to the EFI system partition. UEFI firmware executes it and loader works like non-UEFI loader does. I.e. it searches freebsd partitions via libefi and loads kernel. > * How much of the kernel needs to be changed to boot/run from an EFI boot? I think it is not needed. > * It seems possible to support booting from legacy BIOS as well as EFI > (install a protective MBR, and gpt[zfs]boot on a FreeBSD boot > partition, install the EFI boot loader in a way that the EFI firmware > will find it and load it, and the system itself on another partition). > Is it worth trying to do this? We already can boot via PMBR+gpt[zfs]boot, but EFI loader should not depend on that. -- WBR, Andrey V. Elsukov _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
