It has taken many hours, but my Mac Pro (model MacPro1,1) finally
automatically booted Debian from rEFInd and the grub2 menu.
Problems/challenges:
- grub-efi[-ia32[-bin]] doesn't properly set the path to find the efi
image when installed and set-up by a package manager. I've filed a bug
report [#677280]. The upshot of this is when you select
/boot/grub/grub.efi in rEFInd, you are dropped at a grub-rescue prompt.
- When I built my own grub2 from source and followed the instructions
here: https://help.ubuntu.com/community/UEFIBooting, I could
successfully get to a grub prompt (not grub-rescue), but still no menu
of linux kernels, etc. I did not figure out what I needed to type in at
the grub prompt to get a successful boot. These instructions
specifically set a null --prefix for grub-mkimage, which may be part of
the problem?
- Today, I uninstalled my homemade grub2 (in /usr/local) to get back to
Debian's grub-efi because Debian's constructed grub.cfg was the one that
worked best from the supergrub rescue CD. I also found these
instructions: http://mennucc1.debian.net/macbook_linux_efi.html
and gave them a try. Note, these instructions explicitly set all the
paths in the /EFI partition. Specifically,
grub-mkimage -O x86_64-efi -o /efi/efi/grub/grub.efi \
-p /efi/grub part_gpt hfsplus fat ext2 normal \
chain boot configfile linux multiboot
I copied the grub.cfg from /boot/grub to
/{EFI partition mount point)/EFI/grub/ and rebooted. It actually
booted! I didn't have video, but the harddisk churned away. When grub
started, it said
"error no suitable mode"
"however continuing..."
This message with the little grub info stayed in a tiny box in the
middle of my screen. So, now all I need to do is understand how to get
the right video module/driver in the right place.
The instructions that worked for me above have this next for the right
video:
function load_video {
set debug=fb
insmod efi_gop
#insmod vbe
}
and then specify if you have an older Mac, maybe use efi_uga.
When I look at the files in /etc/grub.d, it looks like these modules
should be in there, but when I look at my grub.cfg, this is my
load_video function:
function load_video {
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
}
Does anyone know how I get the Debian grub2 scripts to grab and add the
right modules to my grub.cfg? I will try hand editing grub.cfg tomorrow,
but I assume those changes will be over-written the next time grub is
updated.
As another possible workaround, might it work to run grub-mkimage with
efi_uga in the modules list?
Thanks for any thoughts.
--
To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org
with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Archive: http://lists.debian.org/4fd838fd.80...@yahoo.com
