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 [off-list ref]
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