From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Jackson <mpfj-list@mimc.co.uk>
Date: Thu, 21 Feb 2013 12:10:19 +0000
Subject: [U-Boot] AM335x : failure to boot SPL from NAND
In-Reply-To: <51239267.2060006@mimc.co.uk>
References: <511D08AF.7070501@mimc.co.uk> <20130215211332.GA19902@bill-the-cat>
	<51223E23.6030209@mimc.co.uk> <20130218145419.GA29026@bill-the-cat>
	<51239267.2060006@mimc.co.uk>
Message-ID: <51260EAB.9030803@mimc.co.uk>
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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.