[PATCH v2] mtd/nand: Support Micron chips, pagesize >= 4KB

[Kevin Cernekee]

On Mon, Aug 23, 2010 at 1:22 AM, Matthieu CASTET
<matthieu.castet at parrot.com> wrote:
>> The NAND controllers on certain legacy SoCs are not able to read the
>> ONFI parameter page, even if the flash device itself supports ONFI.
>
> Why ?
> Are there controllers that doesn't allow to send custom command ?

Yes.  The controllers I have here operate at a relatively high level
(read page, write page, erase block).  Part of the reason for this is
because the controller is designed for XIP and DMA - operations where
it is not practical to have the CPU involved in building command
sequences or wiggling ALE/CLE.

Newer versions of the hardware do have the ability to issue custom
commands and perform ONFI queries, but the versions in the field right
now do not.