[U-Boot-Users] Atmel DataFlash hooks.

Ulf Samuelsson ulfs at atmel.com
Sat Jan 27 18:17:11 CET 2007

Andreas Schweigstill wrote:
> Hello!
> Wolfgang Denk schrieb:
>> ... and to me this sounds is if it would fit better  in  the  set  of
>> flash  related  commands  (protect  etc.)  than  any  other  existing
>> interface.
> The flash related commands could work on an extension of the block
> device layer. IDE/ATA drives also seem to have a means for provision
> of drive geometry data to the file system driver or application (e.g.
> fdisk under DOS/Windows/Linux). (Yes, I am just joking... :-) )
> There is something what I really don't like about U-Boot's current
> Dataflash implementation: after copying data to Dataflash using the
> "cp.b" command the source data has been corrupted; it has been swapped
> with the old contents of the Dataflash. The reason for this behaviour
> can be found in the AT91F_SpiWrite() function (at45.c) which programs
> the PDC to use the SPI transmit buffer address also as receive
> address. Has anybody found out if it is possible to ignore the read
> data?

If you find that annoying, you can always generate a patch
which allocates a 1056 byte buffer and use that
as the receive buffer for all transfers.

> With best regards
> Andreas Scheigstill

Best Regards,
Ulf Samuelsson
ulf at atmel.com
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