Re: MIPS 4KEc with 2.6.15

[Jorgen Lundman <lundman@lundman.net>]

Sorry, I should have said, I grabbed 2.6.15.7 to use. And after the 
issues, I even tried the exact 2.6.15 tarball off Sigmas FTP with the 
same results. It does not define flush_cache_pages for Atlas board, only 
SGI IPxx from what I can tell.

Ralf Baechle wrote:
> On Mon, Jan 07, 2008 at 09:39:29AM +0900, Jorgen Lundman wrote:
> 
>> 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:
> 
> While you may not be able to change the kernel running on your board,
> you should be building any modules against kernel headers of the exact
> kernel running and configured for the platform and CPU you're using.
> 
> Mixing and matching different versions and configurations may work but
> frequently it will fail silently.
> 
>   Ralf
> 

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