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From: Mark Jackson <mpfj-list@mimc.co.uk>
To: u-boot@lists.denx.de
Subject: [U-Boot] AM335x : failure to boot SPL from NAND
Date: Mon, 18 Feb 2013 14:43:47 +0000	[thread overview]
Message-ID: <51223E23.6030209@mimc.co.uk> (raw)
In-Reply-To: <20130215211332.GA19902@bill-the-cat>

On 15/02/13 21:13, Tom Rini wrote:
> On Thu, Feb 14, 2013 at 03:54:23PM +0000, Mark Jackson wrote:
> 
>> I'm trying to diagnose why our AM335x based CPU board (based on the
>> AM335x Starter Kit) can boot SPL and U-Boot from an MMC card, but is
>> unable to boot from NAND (connected to CS0).
>>
>> Following the TI wiki
>> (http://processors.wiki.ti.com/index.php/AM335x_U-Boot_User%27s_Guide#Flashing_images_to_NAND_in_SD_boot)
>> I:-
>>
>> (1) boot from MMC
>> (2) erase the nand
>> (3) copy MLO from MMC into NAND
>> (4) verified it copied correctly (using crc32)
>>
>> When I reboot the board in NAND mode, I get nothing on UART0.
>>
>> If I reboot in MMC mode, SPL and U-Boot load correctly.
>>
>> Can anyone give me some pointers on the boot sequence, and where I
>> might look to help debug the problem ?
> 
> Assuming you're using mainline U-Boot and can rule out "vendor
> problems", if you can access the SYSBOOT pins, set it up for a mode that
> does NAND and UART.  If you never see the 'CCC' on console (or only see
> it the first time if you do UART then NAND), then you are starting SPL
> and dying in there.  If you just see a stream of C then your file is not
> written to NAND correctly.

Interesting ... I don't get any 'CCC' on the console.

However, I then tested this by booting via MMC, erasing the NAND chip and
then trying to reboot via NAND again.

I still get no 'CCC' on the console !?!

This is using boot mode 10011 (NAND, NANDI2C, MMC0, UART0), so I would expect
to either boot via MMC (if I left it in) or get some 'CCC' output on the
console.

I can see that the NAND signals always have a burst of activity every 10ms.
That must be a timeout of some sort ... do you know if that's a hardware or
software timeout ?

Mark J.

  reply	other threads:[~2013-02-18 14:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-14 15:54 [U-Boot] AM335x : failure to boot SPL from NAND Mark Jackson
2013-02-15 21:13 ` Tom Rini
2013-02-18 14:43   ` Mark Jackson [this message]
2013-02-18 14:54     ` Tom Rini
2013-02-19 14:55       ` Mark Jackson
2013-02-21 12:10         ` Mark Jackson

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