Messages in this thread | | | Date | Sat, 9 Aug 2014 20:23:02 +0100 | From | Matt Fleming <> | Subject | Re: Loading initrd above 4G causes freeze on boot |
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On Sat, 09 Aug, at 09:44:55AM, Yinghai Lu wrote: > On Sat, Aug 9, 2014 at 7:23 AM, Mantas Mikulėnas <grawity@gmail.com> wrote: > > As of commit 4bf7111f5016 ("x86/efi: Support initrd loaded above 4G"), > > the kernel freezes at the earliest possible moment when trying to boot > > via UEFI on my Asus laptop. (It still boots via BIOS.) > > > > If I revert that commit on current master (c309bfa9b481), it boots > > correctly again [although I see "setup_efi_pci() failed" being printed]. > > > > (Seems like it freezes when handle_cmdline_files() attempts to read > > the last chunk of the initramfs -- the last call to efi_file_read() > > never returns. Figuring out why that happens is beyond me, though.) > > > > Matt found that efi_file_read()/firmware has problem that could not do > several reading. Please check if reverting that commit have any > difference. > > --- > I spent some time playing around with this bug and it appears to be > triggered by the read-a-chunk-at-a-time logic in handle_cmdline_files(), > (which is itself a bug workaround) introduced here, > > commit 2d2da60fb40a > Author: Maarten Lankhorst <m.b.lankhorst@gmail.com> > Date: Fri Dec 16 13:30:58 2011 +0100 > > x86, efi: Break up large initrd reads
Right, I committed a patch to workaround this problem here,
http://git.kernel.org/cgit/linux/kernel/git/mfleming/efi.git/commit/?h=next&id=1c24a2bef39f041eb578189207240d0457ef0ac3
since on my ASUS machine the combination of breaking up initrd reads into chunks and reading into a buffer above 4G actually triggers a whole new bug.
Mantas, could you try out the patch referenced above and pass "efi=nochunk" on the command line to the EFI boot stub. I'm hoping that fixes your problem.
-- Matt Fleming, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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