linux-kernel - Re: kernel boot fail with efi earlyprintk (bisected)

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Date:	Thu, 21 Aug 2014 21:52:24 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Dave Young <dyoung@...hat.com>
Cc:	lv.zheng@...el.com, matt.fleming@...el.com,
	linux-efi@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, devel@...ica.org, lenb@...nel.org,
	rafael.j.wysocki@...el.com, robert.moore@...el.com
Subject: Re: kernel boot fail with efi earlyprintk (bisected)

On Tue, 19 Aug, at 04:16:58PM, Dave Young wrote:
> Hi,
> 
> 3.16 kernel boot fail with earlyprintk=efi on my laptop.
> It keeps scrolling at the bottom line of screen.
> 
> Bisected, the first bad commit is below:
> commit 86dfc6f339886559d80ee0d4bd20fe5ee90450f0
> Author: Lv Zheng <lv.zheng@...el.com>
> Date:   Fri Apr 4 12:38:57 2014 +0800
> 
>     ACPICA: Tables: Fix table checksums verification before installation.
> 
> 
> I did some debugging by enabling both serial and efi earlyprintk, below is
> some debug dmesg, seems early_ioremap fails in scroll up function due to
> no free slot, but I'm still not sure if the debug info is right or not.

Thanks Dave, your callstack seems to make sense.

Can you also enable early_ioremap_debug so that we can figure out where
all the FIXMAP slots are going?

-- 
Matt Fleming, Intel Open Source Technology Center
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