[Buildroot] Dataflash rootfs problems (still)

Jorge S. jorgesolla at gmail.com
Thu Oct 25 17:58:22 UTC 2007


Kernel 2.6.22 doesn't compile when enabling bitbang... Ulf suggests using
H/W SPI.... what to do!?



2007/10/25, Ivan Kuten <ivan.kuten at promwad.com>:
>
> Ulf Samuelsson wrote:
> >> What about using the SPI bitbang driver for the AT91??
> >>
> >
> >
> > Not a good idea since you are transferring large amount of data.
> > Better to use the PDC and the H/W SPI.
> > Just set down the speed of the SPI.
> >
>
> It was some discussion about Atmel SPI and RM9200 on spi-devel mailing
> list and as far as I know
> Atmel SPI (H/W SPI) is not working for RM9200 - that why Andrew Victor
> (AT91 maintainer)
> still maintaining mtd_dataflash and at91 spi bitbang in his AT91 patches.
> I reported about a half of year ago that it's still not working with
> RM9200.
>
> You have only choice SPI bitbang on lower speed and verify data that is
> read and written.
>
> Best regards,
> Ivan
> --------------------------------
> Embedded Linux engineer,
> Promwad Company: http://www.promwad.com/
> Homepage : http://www.ivankuten.com/
> --------------------------------
>
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