From mboxrd@z Thu Jan  1 00:00:00 1970
From: Scott Wood <scottwood@freescale.com>
Date: Fri, 12 Feb 2010 12:53:46 -0600
Subject: [U-Boot] [PATCH] add explicit bbt creation to commandline
In-Reply-To: <27567768.post@talk.nabble.com>
References: <20080706080456.GF4167@prithivi.gnumonks.org>	<27558231.post@talk.nabble.com>	<20100212170411.GA21800@loki.buserror.net>	<27566937.post@talk.nabble.com>
	<4B759454.8070906@freescale.com> <27567768.post@talk.nabble.com>
Message-ID: <4B75A3BA.8000501@freescale.com>
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

Steven Zedeck wrote:
> First of all, I inherited much of this code, especially the NAND-related
> stuff. I've never needed to go into this portion of the code.
> 
> It seems we are using the mtd driver as all our files dealing with nand are
> in drivers/mtd/nand. The only place I see NAND_USE_FLASH_BBT being used is
> in nand_bbt.c in nand_default_bbt. I see this:
> 
> this->options |= NAND_USE_FLASH_BBT;
> return nand_scan_bbt (mtd, &agand_flashbased);
> 
> Is this what you are referring to?

No, I mean in the NAND driver for your specific hardware 
(fsl_elbc_nand.c, mxc_nand.c, ndfc_nand.c, etc).

> Also, once we get the BBT created, does the code that loads Linux use that
> info ?

The BBT is created on the flash.  Linux runs pretty much the same code 
as u-boot and will use the on-flash BBT if its NAND driver specifies 
NAND_USE_FLASH_BBT.  This isn't about in-memory BBTs.

-Scott