Numonyx M29EW devices report incorrect write buffer

http://datasheet.octopart.com/PC28F256M29EWLA-Micron-datasheet-11738582.pdf
p.114, CFI query return data x16 offset 0x2A and 0x2B, both x16 and x8 return 1024,

For X16/X8 mode, the maximum buffer size is 1024 bytes/256 bytes respectively.

http://git.denx.de/?p=u-boot.git;a=commit;h=c502321c4a1bc8d859ecf19b22f9d0ce03954fd6

From c502321c4a1bc8d859ecf19b22f9d0ce03954fd6 Mon Sep 17 00:00:00 2001
From: Jagannadha Sutradharudu Teki
Date: Fri, 1 Mar 2013 16:54:26 +0530
Subject: [PATCH] mtd: cfi_flash: Write buffer size adjustment for M29EW
 Numonyx devices

This patch addjusted the write buffer size for M29EW devices those
are operated in 8-bit mode.

The M29EW devices seem to report the CFI information wrong when
it's in 8 bit mode.

There's an app note from Numonyx on this issue and there's a patch
in the open source as well for Linux, but it doesn't seem to be in mainline.

Signed-off-by: Jagannadha Sutradharudu Teki
Tested-by: Jagannadha Sutradharudu Teki

CFI doens't have info for read buffer size(page size in M29EW)