From: Ralf Baechle <ralf@linux-mips.org>
To: Trevor Hamm <Trevor_Hamm@pmc-sierra.com>
Cc: "'Atsushi Nemoto'" <anemo@mba.ocn.ne.jp>, linux-mips@linux-mips.org
Subject: Re: Problems booting Linux 2.6.18.1 on MIPS34K core
Date: Wed, 22 Nov 2006 21:58:04 +0000 [thread overview]
Message-ID: <20061122215803.GA8819@linux-mips.org> (raw)
In-Reply-To: <E8C8A5231DDE104C816ADF532E0639120194F4EB@bby1exm07.pmc_nt.nt.pmc-sierra.bc.ca>
On Wed, Nov 22, 2006 at 12:31:10PM -0800, Trevor Hamm wrote:
> The source of the problem seems to be with squashfs. When I compare booting a kernel using squashfs to one using cramfs (which always seems to boot successfully on power-up), both are reading the troublesome page from /lib/ld-uClibc.so, and both are calling flush_dcache_page() on this page. But in the case of cramfs, flush_dcache_page() causes an immediate cache flush of that page (mapping_mapped(mapping) in __flush_dcache_page() is returning non-zero), while squashfs just marks the page as dirty and defers the cache flush (mapping_mapped(mapping) is returning zero). I have no idea what causes this difference in behaviour, but right now it appears to be a bug in squashfs rather than the linux-mips kernel.
There are a few other potencial and real bugs me and Atsushi have found
in squashfs. Guess there is a reason why it's not yet in the kernel ...
I'm still waiting for feedback from the squashfs author.
Ralf
next prev parent reply other threads:[~2006-11-22 21:58 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-22 20:31 Problems booting Linux 2.6.18.1 on MIPS34K core Trevor Hamm
2006-11-22 21:58 ` Ralf Baechle [this message]
2006-11-22 22:43 ` David McCullough
-- strict thread matches above, loose matches on Subject: below --
2006-11-15 23:09 Trevor Hamm
2006-11-15 19:23 Trevor Hamm
2006-11-17 10:13 ` Atsushi Nemoto
2006-11-14 21:47 Trevor Hamm
2006-11-15 14:06 ` Atsushi Nemoto
2006-11-09 17:20 Trevor Hamm
2006-11-10 3:16 ` Atsushi Nemoto
2006-11-08 19:51 Trevor Hamm
2006-11-08 19:09 Trevor Hamm
2006-11-08 19:24 ` Ralf Baechle
2006-11-09 1:57 ` Atsushi Nemoto
2006-11-01 20:06 Trevor Hamm
2006-11-02 2:19 ` Atsushi Nemoto
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