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Re: MIPS 4KEc with 2.6.15

To: Jorgen Lundman <lundman@lundman.net>
Subject: Re: MIPS 4KEc with 2.6.15
From: David Daney <ddaney@avtrex.com>
Date: Mon, 07 Jan 2008 07:52:47 -0800
Cc: linux-mips@linux-mips.org
In-reply-to: <478174C1.2090708@lundman.net>
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Jorgen Lundman wrote:
>
> Hello list,
>
> I have an embedded device running 2.6.15 kernel on a MIPS 4KEc 300MHz
> CPU. It was configured for Sigma's tango2 board, which I know nothing
> about, so I picked a mips-board by random, "atlas", and found I can
> produce working kernel module compiles.
>
> However, when I compiled FUSE kernel module, it behaves erratically in
> a way making the FUSE developer think I may have come across the cache
> coherency bug in arm and mips, fixed sometime around 2.6.17.
>
> Since I can not change the kernel that is running, I was looking for
> alternate solutions. FUSE itself has a work around, that calls
> flush_cache_page(), but I found that mips-board atlas does not have
> this defined:
>
> fuse: Unknown symbol flush_cache_page

There are cache coherency issues on the 8634.  You should be using the
vendor's very most recent kernels.  For me they seem to have resolved
the cache issues.

Also as noted by others, you need the exact kernel sources if you are
going to build working modules.

David Daney

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