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List:       uclinux-dev
Subject:    RE: [uClinux-dev] PATCH: speedup of flash writing (cfi_cmdset_0002.c)
From:       "Barry Baldwin" <bbaldwin () indyme ! com>
Date:       2006-04-26 17:18:23
Message-ID: 7EF7596FB7F60D49B90F33EED617C2849D50F3 () indymemail2 ! indyme ! local
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Hi,

I would like to try you patch, but it appears that the flash chip we are using, \
Toshiba TC58FVM7B2A, doesn't support the fast-programming mode, only by-pass mode.  \
Just out of curiosity, what flash chip are you using?  Our flash write times are \
painfully slow and we might want to design in a different flash chip if we can speed \
up our write times.

Thanks very much,
Barry

-----Original Message-----
From: uclinux-dev-bounces@uclinux.org
[mailto:uclinux-dev-bounces@uclinux.org]On Behalf Of Falk Brettschneider
Sent: Thursday, April 20, 2006 3:19 AM
To: uclinux-dev@uclinux.org
Cc: microblaze-uclinux@itee.uq.edu.au
Subject: [uClinux-dev] PATCH: speedup of flash writing
(cfi_cmdset_0002.c)


Hi,
I patched drivers/mtd/chips/cfi_cmdset_0002.c with the result that writing
to my flash is significantly faster now (10 times or more). I don't use
bypass mode, but switch to fast programming mode. In that mode I can write
32 dwords at once instead of the usual 16bit access.
It works perfectly here, but look at the patch, it needs some changes to
generalise it. E.g. I hard-wired my flash base address.
I want to give my patch to you as pattern for a better fix for speedup of
that driver family. I'm also not sure if that fast-programming mode (AA 55
25 count) is available for all CFI chips in general.
Any feedback would be welcome.
Cheers, F@lk

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