[U-Boot] AM335x : failure to boot SPL from NAND

[Mark Jackson]

On 19/02/13 14:55, Mark Jackson wrote:
> On 18/02/13 14:54, Tom Rini wrote:
>> On Mon, Feb 18, 2013 at 02:43:47PM +0000, Mark Jackson wrote:
>>> 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).
> 
> Just a quick update (in case anyone else is in the same boat) ...
> 
> Looks like the upper data bus (AD[15:8]) needs to have pullups on it, even though
> you're booting from an 8bit device.

Just to update this ... *pulldowns* (not pullups) were needed to get it to boot reliably.