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List:       linux-arm-kernel
Subject:    Re: [CFT] Mark IO as bufferable
From:       Jeff Lackey <jlackey () applieddata ! net>
Date:       2005-06-28 13:30:33
Message-ID: 1119965433.1131.9.camel () localhost ! localdomain
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On Tue, 2005-06-28 at 02:38, Manav Gautam wrote:
> It atleast boots for me and on a pxa255 . The kernel i patched is 2.6.8-1 btw
> 
> Uncompressing Linux......................................................................
> done, booting the kernel.
> Linux version 2.6.8.1 (manav@ws178.ncoretech.com) (gcc version 3.2.3)
> #247 Tue Jun 28 06:28:42 IST 2005
> CPU: XScale-PXA255 [69052d06] revision 6 (ARMv5TE)

> On 6/28/05, Richard Purdie <rpurdie@rpsys.net> wrote:
> > On Mon, 2005-06-27 at 17:37 +0100, Russell King - ARM Linux wrote:
> > > Can people please test out the effect of this change.  Potentially it
> > > should get slightly better IO performance.  Or it could prevent the
> > > kernel booting.
> > >
> > > Please let me know what CPUs it works / does not work with, and
> > > also the outcome of the write buffer test on a kernel without this
> > > patch applied.  IOW, the line starting:
> > >
> > >       CPU: Testing write buffer coherency
> > >
> > > Thanks.
> > 
> > The patch stops the PXA255 from booting. I never see anything after
> > Uncompressing Linux...
> > 
> > A working kernel gives:
> > 
> > CPU: XScale-PXA255 [69052d06] revision 6 (ARMv5TE)
> > CPU: Testing write buffer coherency: ok
> > 
> > Richard

I tried the change on a PXA270 system...

Linux version 2.6.11.7
CPU: XScale-PXA270 [69054114] revision 4 (ARMv5TE)

I got the same result as Richard.  Nothing after Uncompressing Linux...

-- 
Jeff Lackey                              Linux Engineer
Applied Data Systems                www.applieddata.net
434-244-9504                    jlackey@applieddata.net

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