Re: EFI boot problem with MBP 5,4

[Robert Millan]

On Tue, Jan 05, 2010 at 05:15:02PM +0000, Daire Byrne wrote:
> Hi,
> 
> It looks like recent kernels (namely 2.6.31 and 2.6.32) can't find the
> initrd when booting from grub (efi) on a macbook pro 5,4 giving the
> error:
> 
>   RAMDISK: Couldn't find valid RAM disk image starting at 0.
> 
> The 2.6.30 kernel does not seem to suffer from this so something must
> have changed in 2.6.31+. I also tested all three kernels on a MBP4,1
> and they all boot fine from grub - they find and load the initrd. In all
> cases the grub.cfg and initrd remained the same and only the kernel
> was changed. This could be a kernel issue but the fact that they all
> boot on a MBP4,1 makes me think it is a EFI1.1 vs EFI 2.0 thing.
> 
> As an aside I can get the nvidia module working with MBP5,4+2.6.30 but
> a MBP4,1+2.6.30 can't find the vbios. Is this a known thing and is
> there a possible fix for it?

Perhaps you could run a regression test (aka bisect) on Linux source?  This
would help us figure out the problem (whether it's a bug in Linux, in GRUB
or in your firmware).

-- 
Robert Millan

  "Be the change you want to see in the world" -- Gandhi