On Sep 13, 2012, at 3:54 AM, Prabhakar Kushwaha wrote:

IFC-1.1.0 uses 28nm techenology for SRAM. This tech has known =

limitaion for

SRAM i.e. "byte select" is not supported. Hence Read Modify Write is
implemented in IFC for any "system side write" into sram buffer. =

Reading an

uninitialized memory results in ECC Error from sram wrapper.
=20
Hence we must initialize/prefill SRAM buffer by any data before =

writing

anything in SRAM from system side. To initialize SRAM user can use =

"READID"

NAND command with read bytes equal to SRAM size. It will be a one time
activity post boot.
=20
Signed-off-by: Prabhakar Kushwaha <redacted>
---
Based upon git://git.infradead.org/linux-mtd.git branch master
The compilation of this patch depends upon following patch.
http://patchwork.ozlabs.org/patch/177893/
This patch is currently applied on =

git://git.kernel.org/pub/scm/linux/kernel/git/galak/powerpc.git=20

branch next and status is "Awaiting Upstream"
=20
=20
drivers/mtd/nand/fsl_ifc_nand.c |   56 =

++++++++++++++++++++++++++++++++++++++-

1 file changed, 55 insertions(+), 1 deletion(-)

If MTD maintainers ack, I'm happy to pull this in via PPC tree.

- k=