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Old 03-08-2011, 01:30 PM
Daniel Kahn Gillmor
Default Bug#617377: linux fails to functionally boot under EFI (using grub-efi-amd64)

Package: linux-image-2.6.37-2-amd64

I got grub-efi-amd64 working on a very modern macbook. When i tried to
use it to boot linux (using both the squeeze kernel
(linux-image-2.6.32-5-amd64) and the unstable kernel, booting the kernel
with no parameters resulted in a hung machine with no output on the
video console at all.

If i supplied the "noefi" kernel parameter, the machine would boot, and
the console messages would come up, but there would be no keyboard, and
i'd get error messages from ehci_hcd and ohci_hcd suggesting that i try
setting pci=biosirq. If i set both noefi and pci=biosirq, i continue
getting the same errors. (sorry i don't have the exact transcript of
the error messages -- i no longer have the machine to copy them down).

I believe modern macbook kbds are connected via USB, so the module
failures would explain why the kbd was unresponsive.

Ultimately, i gave up on booting through EFI and booted with emulated
BIOS mode. The machine works OK under emulated bios, but it would be
nice to avoid the extra layer of cruft if possible.

I found a gentoo discussion of what it took to get the kernel running
cleanly under plain EFI on a comparable machine:


But the reference link (which was actually full of detailed info on
saturday) is now showing an IIS7 welcome graphic :/


They pointed in particular to this patch for running EFI in physical mode:


Sorry i don't have more details at the moment. I can gather more
details about the machine from its owner if that would be useful.


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