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

[Anton Vorontsov <avorontsov@ru.mvista.com>]

On Wed, May 28, 2008 at 08:38:37PM +0200, Wolfgang Grandegger wrote:
> Scott Wood wrote:
> > On Wed, May 28, 2008 at 08:12:28PM +0200, Wolfgang Grandegger wrote:
> >> This patch adds support for NAND FLASH on the TQM8548. It is disabled by
> >> default and can be enabled for the TQM8548 modules. Note that the R/B pin
> >> is not supported by that module requiring to use the specified maximum
> >> delay time.
> >>
> >> Note: With NAND support enabled the size of the U-Boot image exceeds
> >> 256 KB and TEXT_BASE must therefore be set to 0xfff80000 in config.mk,
> >> doubling the image size :-(.
> > 
> > What does this do differently from the code in drivers/mtd/nand/fsl_upm.c?
> 
> Maybe it does not support multi banks on a NAND chip. I have to check.

Me thinks that you'll have to call fsl_upm_nand_init() for each
chip, and that's all. If not, feel free to patch it as you feel appropriate,
I'll able to regress-test this driver on MPC8360E-RDK.

> > How much of this is board-specific?
> 
> Well, I already gave drivers/mtd/nand/fsl_upm.c a try but was unable to
> get it working on this board. Therefore I decided to keep this known to
> work driver which we have already for a while.

This isn't really an excuse to duplicate drivers. :-) This driver was
tested on MPC8555 and MPC8360 CPUs, so it should work with no drastic
changes. Some issues might still be there, and if so, fixes are highly
appreciated.

> With Linux, I had more success.

..especially if general idea works well, we should use single driver.

Thanks,

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