From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Jackson <mpfj-list@mimc.co.uk>
Date: Tue, 19 Feb 2013 14:55:35 +0000
Subject: [U-Boot] AM335x : failure to boot SPL from NAND
In-Reply-To: <20130218145419.GA29026@bill-the-cat>
References: <511D08AF.7070501@mimc.co.uk> <20130215211332.GA19902@bill-the-cat>
	<51223E23.6030209@mimc.co.uk> <20130218145419.GA29026@bill-the-cat>
Message-ID: <51239267.2060006@mimc.co.uk>
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To: u-boot@lists.denx.de

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.

I guess the AM335x internal boot code assumes everything is 16bit (even though
SYSBOOT[8] is used to configure 8/16bit device).

Mark J.