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

Tom Guilliams tguilliams at sbs.com
Thu Apr 24 22:37:38 CEST 2003

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.


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