On 21/06/2010 15:30, Lucas wrote:

Peter Horton<phorton<at>  bitbox.co.uk>  writes:

quoted

Fix AT91SAM9G20 as per the errata in the datasheet.

If the SDRAM is not cleanly shutdown before reset it can be left driving
the bus, which then stops the bootloader booting from NAND.

Signed-off-by: Peter Horton<phorton<at>  bitbox.co.uk>
--

Hi Peter,

Any Idea how to implement this for the WDT and hardware reset(NRST)?
A hardware reset sometimes still stops the bootloader booting from NAND.

Not possible to fix as far as I understand it. We've had to put down a 
small DataFlash which then boots from NAND.

Turns out we needed DataFlash anyway as the Atmel boot ROM is not 
compatible with newer NANDs (newer NANDs no longer guarantee block 0 
without ECC and the Atmel boot ROM doesn't support ECC).

P.