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 (http://www.intel.com/design/flcomp/applnots/29226302.pdf). 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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