From: phorton@bitbox.co.uk (Peter Horton)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] Fix AT91SAM9G20 reset
Date: Mon, 21 Jun 2010 16:14:22 +0100 [thread overview]
Message-ID: <4C1F81CE.6000905@bitbox.co.uk> (raw)
In-Reply-To: <loom.20100621T162410-494@post.gmane.org>
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).
P.
next prev parent reply other threads:[~2010-06-21 15:14 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-28 15:37 [PATCH] Fix AT91SAM9G20 reset Peter Horton
2010-06-21 14:30 ` Lucas
2010-06-21 15:14 ` Peter Horton [this message]
2010-10-14 13:34 ` Nicolas Ferre
2010-10-14 15:31 ` Peter Horton
2010-10-14 17:25 ` [PATCH 1/5] Fix AT91SAM9G20 reset as per the errata in the data sheet Nicolas Ferre
2010-10-14 17:25 ` Nicolas Ferre
2010-10-15 12:29 ` Jean-Christophe PLAGNIOL-VILLARD
2010-10-15 12:29 ` Jean-Christophe PLAGNIOL-VILLARD
2010-10-19 10:05 ` Nicolas Ferre
2010-10-19 10:05 ` Nicolas Ferre
2010-10-14 17:25 ` [PATCH 2/5] AT91: trivial: align comment of at91sam9g20_reset with one more tab Nicolas Ferre
2010-10-14 17:25 ` Nicolas Ferre
2010-10-14 17:25 ` [PATCH 3/5] AT91: reset routine cleanup Nicolas Ferre
2010-10-14 17:25 ` Nicolas Ferre
2010-10-14 17:25 ` [PATCH 4/5] AT91: rename at91sam9g20_reset.S to generalize to several chips Nicolas Ferre
2010-10-14 17:25 ` Nicolas Ferre
2010-10-14 17:25 ` [PATCH 5/5] AT91: reset: extend alternate reset procedure " Nicolas Ferre
2010-10-14 17:25 ` Nicolas Ferre
-- strict thread matches above, loose matches on Subject: below --
2010-04-13 8:31 [PATCH] Fix AT91SAM9G20 reset Peter Horton
2009-12-15 9:59 Peter Horton
2009-12-09 13:50 Peter Horton
2009-12-09 14:09 ` Paulius Zaleckas
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