From: Scott Wood <scottwood@freescale.com>
Date: Fri, 16 May 2008 14:17:47 -0500
Subject: [U-Boot-Users] Boot from NAND FLASH
In-Reply-To: <200805161454272032219@gmail.com>
References: <200805161454272032219@gmail.com>
Message-ID: <20080516191747.GA2777@loki.buserror.net>
List-Id: <u-boot.lists.denx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: u-boot@lists.denx.de

On Fri, May 16, 2008 at 02:54:34PM +0800, jiale.Yin wrote:
> Our board is reference with the mpc8313erdb,and its design is to link CS0
> to the NAND FLASH, so I have to boot from NAND other than NOR.In
> /board/mpc8313erdb I can find some files, such as nand_boot.c, nand.c and
> nand_ecc.c,

I assume you're talking about the Freescale BSP, as those files are not in
mainline u-boot.

> which I think are related with booting from NAND.What I want
> to know is if booting from NAND,is there any need to modify the start.s

No, beyond what's already been changed in the BSP to support it.  Make sure
you use a NAND configuration when building u-boot.

> and what is needed to ba added. What's the difference between NOR-BOOT and
> NAND-BOOT. Thank you!

NOR can be mapped in its entirety, while with NAND only the first 4KiB gets
mapped, and that code has to fetch the rest of u-boot from NAND and copy it
to RAM before continuing.

-Scott