[PATCH] Fix AT91SAM9G20 reset
phorton at bitbox.co.uk
Mon Jun 21 11:14:22 EDT 2010
On 21/06/2010 15:30, Lucas wrote:
> Peter Horton<phorton<at> bitbox.co.uk> writes:
>> 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).
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