[PATCH] driver/mtd:IFC NAND:Initialise internal SRAM before any write

[Kumar Gala]

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.
> 
> 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.
> 
> Signed-off-by: Prabhakar Kushwaha <prabhakar at freescale.com>
> ---
> 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 
> branch next and status is "Awaiting Upstream"
> 
> 
> 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