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Date:	Sun, 24 Aug 2014 22:19:04 +0300
From:	Mantas Mikulėnas <>
To:	Harald Hoyer <>
Cc:	Linux Kernel Mailing List <>,, Yinghai Lu <>,
	Matt Fleming <>
Subject: Re: Loading initrd above 4G causes freeze on boot

On Fri, Aug 22, 2014 at 5:43 PM, Mantas Mikulėnas <> wrote:
> On Fri, Aug 22, 2014 at 5:24 PM, Harald Hoyer <> wrote:
> > On 09.08.2014 16:23, Mantas Mikulėnas 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.)
> >>
> >
> > I fixed my issue with:
> ...Well. If that's the _physical_ address, then I suppose it wouldn't
> have worked on my 4 GB laptop either way. (I thought UEFI already used
> some sort of virtual memory, so I never even thought to mention
> this... Oh well.)
> Though if that's the case, then I'm wondering why it would be affected
> by the read size? Shouldn't it have crashed either as soon as the high
> address was used, or never at all? (I really don't know much about
> memory at this level. Sorry.)
> > Care to test?
> Will try later today.

Finally got around to testing it, and yes, your patch fixes the initrd
boot for me.

Mantas Mikulėnas <>
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