[U-Boot-Users] strataflash.c

[Brad Kemp]

I agree, the strataflash driver as it stands now will not work.  
Brad

> -----Original Message-----
> From: Tom Guilliams [mailto:tguilliams at sbs.com] 
> Sent: Tuesday, May 13, 2003 2:52 PM
> To: 'u-boot-users at lists.sourceforge.net'
> Cc: 'Frank Smith'
> Subject: RE: [U-Boot-Users] strataflash.c
> 
> 
> In a x16 device in x8 mode, the portwidth should be 1.  However, CFI
> detection in strataflash.c will not work in this mode.  It 
> will look for the
> CFI QRY at 0x10, 0x11, 0x12 offsets when they're actually at 
> double that
> offset (portwidth = 2).  
> 
> I agree that the portwidth is not be used correctly in the 
> case of a x16
> device in x8 mode.  For the meantime, the hack I've made will 
> sustain me
> until I or someone else can add support for this chipset mode 
> to the driver.
> 
> Tom
> 
> -----Original Message-----
> From: Frank Smith [mailto:smith at amirix.com] 
> Sent: Sunday, May 11, 2003 4:51 PM
> To: Tom Guilliams; u-boot-users at lists.sourceforge.net
> Cc: Frank Smith
> Subject: Re: [U-Boot-Users] strataflash.c
> 
> 
> Hi,
> 
> The more I look into strataflash.c, the more I'm starting to 
> think that it
> doesn't support x16 devices in x8 mode.
> 
> The problem I see is that the 'portwidth' value is used to 
> drive two things
> -- offset multiplier, and side of data reads/writes to the 
> flash device.
> 
> On a pure x16 device, the offset multiplier is 2 and the size 
> of the data
> read/writes is 2.  So portwidth is 2.
> 
> On an x16 device in x8 mode, however, the offset multiplier 
> is 2, but the
> size of data read/writes is 1.  What should portwidth be...?
> 
> I think the offset multiplier and size of data read/writes 
> should be driven
> by *different* values.  Or am I overlooking something obvious?
> 
> 
> Thanks,
> Frank.
> 
> ----- Original Message -----
> From: "Tom Guilliams" <tguilliams at sbs.com>
> To: "'Frank Smith'" <smith at amirix.com>; 
> <u-boot-users at lists.sourceforge.net>
> Sent: Friday, May 09, 2003 7:14 PM
> Subject: RE: [U-Boot-Users] strataflash.c
> 
> 
> > Frank,
> >
> > I can tell you I've had some problems with a x16 in x8 mode in 
> > strataflash.c.  Basically, the flash_detect_cfi() routine 
> detects my 
> > E28F128J3A chip as portwidth 2 (x16) and chipwidth 1 (x8).  All the 
> > CFI
> info
> > is read correctly.  However, any write accesses to chip 
> (programming 
> > or
> > erasing) fail upon the calculated offset (it's incorrectly 
> doubled because
> > of portwidth being 2).
> >
> > I had to manually force the portwidth to 1 (x8) after the 
> > flash_get_size() routine to make everything behave for any flash 
> > operations.
> >
> > I don't think the "detect" logic is correct in terms of 
> port and chip
> width
> > for "some" devices.  However, the author - Brad Kemp - has 
> said he's 
> > had success on numerous other flash width devices.
> >
> > Your problem sounds exactly like mine.  For a hack fix, set
> >
> > info->portwidth = 1;
> >
> > for the last thing flash_get_size() does before returning the size.
> >
> > Tom
> >
> > -----Original Message-----
> > From: Frank Smith [mailto:smith at amirix.com]
> > Sent: Friday, May 09, 2003 1:00 PM
> > To: u-boot-users at lists.sourceforge.net
> > Subject: [U-Boot-Users] strataflash.c
> >
> >
> >
> > Hello,
> >
> > I have a board with a couple of Intel RC28F320J3A 
> Strataflash devices.
> One
> > device is wired to x16 mode, the other to x8 mode.
> >
> > I'm trying to use the strataflash.c driver with these flash chips.  
> > The driver detects the flash that's in x16 mode, but not 
> the one in x8 
> > mode.  So I'm digging through the code to try to figure out 
> what's up.  
> > I've been successful in avoiding dealing with flash 
> programming code 
> > up until now in my life.....
> >
> > If anyone knows anything about whether strataflash.c was 
> designed to 
> > work with x16 devices in x8 mode, I'd love to hear from 
> you! From what 
> > I've
> seen
> > so far, I'm tending to think that it doesn't.
> >
> >
> > Thanks,
> > Frank.
> >
> >
> > -------------------------------------------------------
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> 
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