[Buildroot] Dataflash rootfs problems (still)
jorgesolla at gmail.com
Thu Oct 25 16:46:30 UTC 2007
Ok, i'll give a try, as far as i'm concerned there are two choices for SPI
driver on the kernel:
Which one is better?, i've tested ATMEL_SPI this afternoon, but the kernel
doesn't detects my dataflash, can you point me to a source of information to
read steps to define my dataflash speed and get detected on boot?.
My previous kernel was detecting the dataflash itself, but when i define the
speed on my board config, the dataflash isn't detected anymore.
2007/10/25, Ulf Samuelsson <ulf at atmel.com>:
> > 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.
> >> ons 2007-10-24 klockan 21:34 +0300 skrev Ivan Kuten:
> >> > >
> >> > > During the 1st boot, Dropbear creates and "writes" the generated
> >> maybe
> >> > > is this *write* operation the one screwing up the dataflash?
> >> > >
> >> >
> >> > We have similar problems with Dataflash&RM9200
> >> > *write* operation is unreliable - we had corrupted filesystem after
> >> reboot.
> >> > Our solution was to use r/o only on dataflash.
> >> >
> >> I would reduce speed to 5 Mbps or lower. or implement the external
> >> Moving to the AT91SAM9260 is of course a nice alternative.
> >> Lower cost, (soon) much higher speed (with the AT91SAM9260A)
> >> Better BootROM (I defined it :-)
> Best Regards
> Ulf Samuelsson ulf at atmel.com
> Atmel Nordic AB
> Mail: Box 2033, 174 02 Sundbyberg, Sweden
> Visit: Kavallerivägen 24, 174 58 Sundbyberg, Sweden
> Phone +46 (8) 441 54 22 Fax +46 (8) 441 54 29
> GSM +46 (706) 22 44 57
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