RE: [microblaze-uclinux] CFI Flash on 8bit bus?

[Steve Sanders <akasanders@xxxxxxxxx>]

Actually...  Greg made the EMC core changes to accomodate 16-bit wide
flash.  I just convinced him that it needed to be done.  :-)  The
changes can be found in the Avnet LX25 design the MicroBlaze uClinux
Project Home Page: 

http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux/Downloads/platforms.html

Steve

--- David Banas <dbanas@nuhorizons.com> wrote:

> Hi Erol,
> 
> Those of us using 16-bit wide FLASH have had to use some
> modifications to
> the actual HDL code for the EMC core. These mods were originally
> written by
> Steve Sanders. I wonder if you're in the same boat and might need to
> follow
> Steve's example, in order to make the EMC core compatible with your
> FLASH.
> 
> David Banas
> Field Applications Engineer
> Nu Horizons Electronics Corp.
> 2070 Ringwood Avenue
> San Jose, CA 95131
> (408)434-0800 - office
> (415)846-5837 - cell
> http://www.nuhorizons.com
> 
> > -----Original Message-----
> > From: owner-microblaze-uclinux@itee.uq.edu.au
> [mailto:owner-microblaze-
> > uclinux@itee.uq.edu.au] On Behalf Of Errol Terblanche
> > Sent: Friday, July 01, 2005 12:42 AM
> > To: microblaze-uclinux@itee.uq.edu.au
> > Subject: [microblaze-uclinux] CFI Flash on 8bit bus?
> >
> > Hi everyone,
> >
> > I have been struggling with flash for the last few days, and I'm at
> my
> > wit's
> > end.
> >
> > I have configured mtd to use Intel flash and to use 8bit bus width.
> >
> > During boot I get the following message:
> >
> > [snip]
> > physmap flash device: 1000000 at 24000000
> > cfi_cmdset_0001: Erase suspend on write enabled
> > 0: offset=0x0,size=0x20000,blocks=128
> > Using buffer write method
> > physmap: no partition info available, registering whole flash at
> once
> > [snip]
> >
> > That tells me that it did detect the chip, as its block size is
> > 0x20000(128KB) and it has 128 blocks for a total of 16MB.
> >
> > But when I try and format(or dd) it I get the following:
> >
> > [snip]
> > # ftl_format /dev/mtd0
> > Partition size = 16 mb, erase unit size = 128 kb, 1 transfer units
> > Reserved
> > 5%, formatted size = 15631872 bytes Erasing all blocks...
> > Chip reports improper command sequence: status 0x7000000000
> >
> > block erase failed: Input/output error
> > format failed.
> > [snip]
> >
> > The only thing that I can think of is that mtd is accessing it as
> > something
> > other than 8 bit mode thus sending erroneous blank commands during
> the
> > erase
> > command sequence. And why is 0x7000000000 a 40 bit number?
> >
> > Thanx,
> > Errol
> >
> >
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> > Project Home Page :
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> > uclinux/
> >
> >
> >
>
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