[U-Boot-Users] AMD MirrorBit FLASH Support?

Brad Kemp Brad.Kemp at Seranoa.com
Fri Apr 25 17:00:59 CEST 2003

There is CFI support for the Intel command set in ppmc8260/strataflash.c
and esd/cpic440/strataflash.c. 
This driver correctly sizes the flash width and number of chips. 
What is missing is an abstraction to support multiple command sets.

> -----Original Message-----
> From: Tom Guilliams [mailto:tguilliams at sbs.com] 
> Sent: Thursday, April 24, 2003 4:38 PM
> To: Frederic Soulier
> Cc: u-boot-users at lists.sourceforge.net
> Subject: Re: [U-Boot-Users] AMD MirrorBit FLASH Support?
> Thanks for the reply Frederic.
> On Tue, 2003-04-22 at 01:12, Frederic Soulier wrote:
> > If you want full support for Mirrorbit flashes in U-Boot, 
> you have simply to
> > code the write buffering feature.
> > I do not use this, so standard AMD/Fujitsu/ST code is 
> working fine for me.
> > 
> We're finding a bit more to it than that.  The algorithms for 
> operations
> on the MirrorBit have changed a bit from other AMD chips.  Some
> operations rely upon toggle bits, different command definitions.  The
> "correct" error-checking is what's really effected.  I was porting the
> StrataFlash driver for the PPMC8260 board because we have 
> some versions
> of our board with StrataFlash and some AMD MirrorBit as well as the
> driver implements the CFI interface.
> My plan is to have a strataflash/mirrorbit driver with buffer writing
> support.  I just need to finish it up and submit it to 
> Wolfgang.  As our
> board support grows, I'm adding upon this driver for other chipset
> support.  At some point, it would be nice to have a flash driver with
> CFI for all chips that support it.
> Tom
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