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

1 May 2003

      Tien
I have used this driver on 2 other boards with strataflash The boards
have different flash widths.
The only application specific part is the location of the uboot
environment. 
The config for the ppmc8260 may not fall on a sector boundary or be
wrong. If the saveenv fails, check that.
Brad
...
-----Original Message-----
From: Nghiem, Tien [mailto:TNghiem@oerlikon.ca] 
Sent: Wednesday, April 30, 2003 6:08 PM
To: Brad Kemp
Cc: u-boot-users@lists.sourceforge.net
Subject: RE: [U-Boot-Users] AMD MirrorBit FLASH Support?
Hi Brad,
I have a custom board MPC8260 that uses the flash width 64 
bits with 4 chips (28F640J3) as it describes in the 
application note Intel 292263-002. Do you think that I can 
use the flash driver ppmc8260/strataflash.c directly without 
modification?
Thank you
Tien Nghiem
-----Original Message-----
From: Brad Kemp [mailto:Brad.Kemp@Seranoa.com]
Sent: Friday, April 25, 2003 11:01 AM
To: tguilliams@sbs.com; Frederic Soulier
Cc: u-boot-users@lists.sourceforge.net
Subject: RE: [U-Boot-Users] AMD MirrorBit FLASH Support?
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.
Brad
...
-----Original Message-----
From: Tom Guilliams [mailto:tguilliams@sbs.com] 
Sent: Thursday, April 24, 2003 4:38 PM
To: Frederic Soulier
Cc: u-boot-users@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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