Messages in this thread | | | From | <> | Subject | [PATCH] Add support for flag status register on Micron chips | Date | Tue, 8 Apr 2014 11:12:49 -0500 |
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From: Graham Moore <grmoore@altera.com>
This is a slightly different version of the patch that Insop Song submitted (http://marc.info/?i=201403012022.10111.marex%20()%20denx%20!%20de).
I talked to Insop, and he agreed I should submit this patch as a follow-on to his.
This patch uses a flag in the m25p_ids[] array to determine which chips need to use the FSR (Flag Status Register).
Rationale for using the FSR:
The Micron data sheets say we have to do this, at least for the multi-die 512M and 1G parts (n25q512 and n25q00). In practice, if we don't check the FSR for program/erase status, and we rely solely on the status register (SR), then we get corrupted data in the flash.
Micron told us (Altera) that for multi-die chips based on the 65nm 256MB die, we need to check the SR first, then check the FSR, which is why the wait_for_fsr_ready function does that. Future chips based on 45 nm 512MB die will use the FSR only.
Thanks.
Graham Moore (1): Add support for flag status register on Micron chips.
drivers/mtd/devices/m25p80.c | 94 +++++++++++++++++++++++++++++++++++------- 1 file changed, 80 insertions(+), 14 deletions(-)
-- 1.7.10.4
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