[U-Boot-Users] flash erase
CG
christian at mcdi.com
Fri May 28 22:15:53 CEST 2004
Hello,
I think that you're right. I used flash routines in my flash driver which
serve 32-bit data bus width. But I cannot use it if the flash has only one
16-bit...
Is there any flash driver can I refer that use one 28F128J3A... So just only
1 16-bit data bus.
I have to mydify the flash driver... the next step!
Regards
Christian
----- Original Message -----
From: "Kerl, John" <John.Kerl at Avnet.com>
To: "CG" <christian at mcdi.com>; "VanBaren, Gerald (AGRE)"
<Gerald.VanBaren at smiths-aerospace.com>; <u-boot-users at lists.sourceforge.net>
Sent: Thursday, May 27, 2004 4:45 PM
Subject: RE: [U-Boot-Users] flash erase
> Usually what happens is that if one has a 32-bit data bus and 16-bit
> wide flash parts, there are two flash chips side by side. A single
> 32-bit write results in 16 bits going to one chip and 16 bits going
> to the other. Note that flash chips generally lack byte enables so
> in fact one *must* do a single 32-bit write in this case, rather than
> two 16-bit writes.
>
> So, you might want to check (a) processor bus width, (b) processor
> bus width for this particular chip select; (c) flash bus width; (d)
> how many flash chips you have. And if this is a new, custom board,
> please keep in mind that problems are just as likely to need fixing
> with a soldering iron & flywires, as with software mods. Either the
> software or the hardware could be at fault.
>
> > -----Original Message-----
> > From: u-boot-users-admin at lists.sourceforge.net
> > [mailto:u-boot-users-admin at lists.sourceforge.net]On Behalf Of CG
> > Sent: Thursday, May 27, 2004 1:16 PM
> > To: VanBaren, Gerald (AGRE); u-boot-users at lists.sourceforge.net
> > Subject: Re: [U-Boot-Users] flash erase
> >
> >
> > I don't tkink that the AT91RM9200 supports 32-bits data
> > width. The SMC
> > interface supports only 8 or 16-bit data width.It's what I
> > read from the
> > data sheet.
> >
> > I hope to find the real problem soon.
> >
> > Thanks a lot
> >
> > Christian
> >
> > ----- Original Message -----
> > From: "VanBaren, Gerald (AGRE)" <Gerald.VanBaren at smiths-aerospace.com>
> > To: <u-boot-users at lists.sourceforge.net>
> > Sent: Thursday, May 27, 2004 3:13 PM
> > Subject: RE: [U-Boot-Users] flash erase
> >
> >
> > >
> > > Christian:
> > >
> > > It looks like you have your memory controller (BRx/ORx)
> > configured for 32
> > bits but your actual memory width is 16 bits so the processor
> > is reading 32
> > bits on every bus cycle, half of which are garbage.
> > >
> > > gvb
> > >
> > >
> > > > -----Original Message-----
> > > > From: u-boot-users-admin at lists.sourceforge.net
> > > > [mailto:u-boot-users-admin at lists.sourceforge.net]On Behalf Of CG
> > > > Sent: Thursday, May 27, 2004 2:46 PM
> > > > To: Wolfgang Denk
> > > > Cc: u-boot-users at lists.sourceforge.net
> > > > Subject: Re: [U-Boot-Users] flash erase
> > > >
> > > >
> > > > I use only one 16-bit flash device. Also, I wrote some data
> > > > in different
> > > > flash area and it works partially.
> > > >
> > > > I can execute these command :
> > > > cp.b 2000000 10000000 2 => It copies 2 byte (data = 0x0006)
> > > > at 0x10000000
> > > > it seems to work
> > > > cp.b 2000000 10000002 2 => It copies 2 byte at 0x10000002
> > > > cp.b 2000000 10000004 2 => It copies 2 byte at 0x10000004,
> > > > I got problem
> > > > sometimes... it writes only 0x0002 instead of 0x0006
> > > >
> > > > If I type this command:
> > > > cp.b 2000000 10000000 4 => I got problem as I said in my
> > > > previous e-mail
> > > >
> > > > Copy to Flash... not erased at 10000002 (0)
> > > >
> > > > You can see the memory content:
> > > > 10000000: ffff0006 ffffff10 ffff0430 fffffd30
> > > >
> > > > The only problem that I can see now is the home-made PCB that
> > > > I use to test
> > > > the memory flash with the dev. board. In fact, I use 56
> > > > long wires to
> > > > connect each IO from the "flash pcb" to the dev. board. It's
> > > > maybe why the
> > > > communication is unstable. But I hope that it's the only problem.
> > > >
> > > > Regards
> > > >
> > > > Christian
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: "Wolfgang Denk" <wd at denx.de>
> > > > To: "CG" <christian at mcdi.com>
> > > > Cc: "Stephan Linz" <linz at mazet.de>;
> > > > <u-boot-users at lists.sourceforge.net>
> > > > Sent: Thursday, May 27, 2004 2:10 PM
> > > > Subject: Re: [U-Boot-Users] flash erase
> > > >
> > > >
> > > > > In message <052401c443f1$218d1550$6b01a8c0 at cc> you wrote:
> > > > > > Do you have an example to know how to erase the flash
> > > > 28F128J3 from
> > > > INTEL?
> > > > >
> > > > > This has little to do with which chip is being used, but
> > > > more with
> > > > > how your board is organized, i. e. bus width and how many
> > > > chips are
> > > > > used to form a bank. I think you use 2 chips in 16 bit mode
> > > > to form a
> > > > > 32 bit wide bank. This must be implemented in the driver.
> > > > >
> > > > > > I use 16-bit data width, CS0. I would like to use this
> > > > flash in order
> > > > to
> > > > > > store u-boot and applications (linux and ramdisk).
> > > > >
> > > > > Are you really sure? To me it looks more as if there ware 2
> > > > x 16 bit
> > > > > devices on a 32 bit wide bus.
> > > > >
> > > > > Best regards,
> > > > >
> > > > > Wolfgang Denk
> > > > >
> > > > > --
> > > > > Software Engineering: Embedded and Realtime Systems,
> > > > Embedded Linux
> > > > > Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email:
> > > > wd at denx.de
> > > > > Sorry, but my karma just ran over your dogma.
> > > > >
> > > >
> > > >
> > > >
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