Re: [RFC] Change ECC algorithm from userspace

Matthieu CASTET
2011-10-28T11:51:54Z

Javier Martinez Canillas a écrit :
> On Fri, Oct 28, 2011 at 12:30 PM, Matthieu CASTET
> <matthieu.castet@parrot.com> wrote:
>> PS : note that some OMAP ROM support a better protection than Hamming (but the
>> details are not public AFAIK)
>>
>> From OMAP34xx Multimedia Device, Silicon Revision 3.1.x, public version :
>>
>> Pages can contain errors caused by memory alteration. To correct these errors,
>> the ROM code uses ECC,
>> based on Hamming codes for SLC NAND and BCH (Bose, Ray-Chaudhuri, Hocquenghem)
>> code for
>> multilevel cell (MLC) devices. The computed ECC is compared to ECC stored in the
>> spare area of the
>> corresponding page. If there are uncorrectable errors, the ROM code returns with
>> FAIL.
>>
>
> Yes I've read that on the DM3730 TRM but as far as I understand only
> applies to MLC devices, but ours is SLC.
>
It also works on SLC devices. We are using it on micron slc that need 4 bits ECC.

Matthieu