[U-Boot] NAND flash driver for Samsung K9F1G08

[Stefan Roese]

On Wednesday 01 October 2008, Roman Mashak wrote:
> > Flash ID is in $(UBOOT)/include/linux/mtd/nand_ids.h
> > Seems this chip is not CFI compliant (at least datasheet says nothing
> > of it), so the use of CFI driver falls away.
>
> After some investigations I see that $(uboot)/drivers/mtd/nand/nand.c
> is compiled in with CONFIG_CMD_NAND defined and CFG_NAND_LEGACY
> undefined -- these two macros are mutually exclusive.

Correct. The legacy NAND support is, as the name implies, outdated and should 
*not* be used anymore.

> Why do then some 
> platforms define both of them, for instance
> $(uboot)/include/configs/at91rm9200dk.h  and what is the proper use of
> these macros?

Defining both is definitely broken and should be fixed. I think now its really 
time to completely remove the legacy NAND support. It has been dragged along 
for quite some time.

> To make things more clear: NAND flash Samsung K9F1G08U is defined in
> both $(uboot)/drivers/mtd/nand/nand_ids.c and
> $(uboot)/include/linux/mtd/nand_ids.h, latter is included with
> CFG_NAND_LEGACY defined. It confuses me, I don't understand is my
> flash legacy device or rather new one? :-)

IIRC then your NAND chips should be supported in the U-Boot NAND driver 
without any changes.

Best regards,
Stefan

=====================================================================
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
=====================================================================