Re: [Qemu-devel] [PATCH for 1.3] pflash_cfi01: Suppress warning when Linux probes for AMD flash

[Stefan Weil]

Am 26.11.2012 06:31, schrieb walimis:
> On Sat, Nov 24, 2012 at 11:03:13PM +0100, Stefan Weil wrote:
> > There are several ARM and MIPS boards which are manufactured with
> > either Intel (pflash_cfi01.c) or AMD (pflash_cfi02.c) flash memory.
> >
> > The Linux kernel supports both and first probes for AMD flash which
> > resulted in one or two warnings from the Intel flash emulation:
> >
> > pflash_write: Unimplemented flash cmd sequence (offset 0000000000000000, wcycle 
> > 0x0 cmd 0x0 value 0xf000f0)
> > pflash_write: Unimplemented flash cmd sequence (offset 0000000000000000, wcycle 
> > 0x0 cmd 0x0 value 0xf0)
> Hi Stefan,
>
> I ever submited a similar patch to mailing list:
> http://patchwork.ozlabs.org/patch/147886/
>
> Do you have a look at that patch to see whether it's sane for the
> different parts between mine and yours?
>
> Thanks,
> Liming Wang

Hi,

your patch is technically identical, but I think that your commit message
ismisleading: it implies that 0xff and 0xf0 are both specified in the
CFI specification for Intel flash memory (CFI 01). As far as I could see,
0xf0 is only a specified flash command sequence for AMD flash memory 
(CFI 02).
That's why Linux uses it to detect that kind of flash memory.

If you resend your patch with a commit message and a comment in
the code which explains why 0xf0 needs handling in pflash_cfi01.c,
it can be committed IMHO.

Regards

Stefan