Re: [RFC] Change ECC algorithm from userspace

Matthieu CASTET
2011-10-28T10:40:08Z

Jon Povey a écrit :
> linux-mtd-bounces@lists.infradead.org wrote:
>> I want to be able to use 1-bit ECC for the first partition where I
>> save the loader binary and has to be accessed by the ROM boot but use
>> a 4-bit ECC for my rootfs partition.
>>
>> Does anyone have this same issue?
>
> DM355 and DM365 has similar issues as the RBL expects a different OOB/ECC
> layout to Linux.
>
>> What is the best approach to store data in a NAND device using
>> different ECC techniques?
>
> What I have done is write a utility that calculates ECC and writes to
> the mtd device in RAW mode. So to rewrite the bootloader I take care of
> the ECC and layout at application level without changing the kernel.
>
Note that the kernel raw mode doesn't write the page in one time : it write data
and then ecc. This may cause problem with NOP1 nand.

see http://lists.infradead.org/pipermail/linux-mtd/2010-August/031262.html

Matthieu