[U-Boot-Users] [PATCH] TQM85xx: NAND support via local bus UPMB

Anton Vorontsov
2008-05-30T18:28:58Z

On Fri, May 30, 2008 at 08:00:32PM +0200, Wolfgang Grandegger wrote:
[...]
> Fix that, but I can still not access the device properly. I'm a bit
> puzzled because it uses a different algorithm to access the device.
> While my and the Linux fsl_upm driver uses NAND_ALE, NAND_CLE and
> friends to manage the access via hwcontrol callback, the fsl_upm driver
> of U-Boot uses the cmdfunc callback doing different things.

I wonder if your NAND chip is a large page one? Because currently
fsl_upm_nand hardcodes OOB stuff (bad thing, but with old mtd subsystem
I didn't find better way ;-).

As for u-boot and linux doing different things... with this patch
u-boot and linux are identical:

http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot/u-boot-nand-flash.git;a=commitdiff;h=dffa9a8b31b2c21fd3a72ba1f58dd04911b95b6f

This is in U-Boot's mtd-2.6.22.1 branch though. :-/ Your approach with hwctl
seem to be more universal (for old mtd subsystem), since it doesn't duplicate
MTD cmdfunc, thus should work for all NAND chips...

Could you prepare a patch that replacing fsl_upm_nand.c's current logic
with yours (that should work for your NAND chip), and I'll test it
on MPC8360E-RDK?

--
Anton Vorontsov
email: cbouatmailru at gmail.com
irc://irc.freenode.net/bd2