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

[Brad Kemp]

Tien
After looking closer at your application, you will need to add support
for 64 bits flash. Search the code for FLASH_CFI_32BIT.
It is mostly used in case statements. Add the appropriate code for
FLASH_CFI_64BIT. There  is one loop that loop you will need to change
The FLASH_CFI_32BIT to FLASH_CFI_64BIT.
Also the cfiword_t and cfiptr_t unions will need the addition of long
longs.
Brad

> -----Original Message-----
> From: Nghiem, Tien [mailto:TNghiem at oerlikon.ca] 
> Sent: Wednesday, April 30, 2003 6:08 PM
> To: Brad Kemp
> Cc: u-boot-users at 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 at Seranoa.com]
> Sent: Friday, April 25, 2003 11:01 AM
> To: tguilliams at sbs.com; Frederic Soulier
> Cc: u-boot-users at 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 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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