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TI Home » TI E2E Community » Support Forums » ARM® Processors » Sitara™ ARM® » AM3x Sitara ARM Processors Forum » questions on ECC in am335x EVM
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questions on ECC in am335x EVM

questions on ECC in am335x EVM

This question is answered
Lihua Zhu
Posted by Lihua Zhu
on Sep 20 2012 03:29 AM
Intellectual820 points

Hi all,

I have some questions on ECC algorithm used by am335x EVM.

1. BCH4 BCH8 BCH16: I know BCH is one of ECC algorithm, but what's 4, 8, 16 stand for? Is it the ability of error correction? It's able to correct 4, 8, 16 bit per 512bytes?

2. In the ECC schemes usage table:

ECC schemes usage table
ComponentDefault ECC scheme used by the componentECC scheme to be used to flash the componentECC schemes supported by the component
SPL BCH8 BCH8 BCH8
U-boot Hamming BCH8 Hamming/BCH8
Linux BCH8 BCH8 BCH8
File System NA BCH8 NA
Environment variables NA Hamming NA

why we choose BCH8 and Hamming for flashing File system and Environment variables? I mean how to choose the algorithm?

About "algorithm supported by the component", How we know a component support what kind of algorithm? I think it must lie in  the source code, but where?

Thanks and best regards,

Lihua

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  • Avinash Philip
    Posted by Avinash Philip
    on Sep 21 2012 04:07 AM
    Verified Answer
    Verified by Lihua Zhu
    Intellectual950 points

    Hi,

    4, 8 & 16 stands for bit error correction per 512 byte.

    Choosing ecc in U-bot by nandecc command.

    You can see ecclayout os nand driver.

    In case of Linux, <drivers/mtd/nand/omap2.c> &

    U-boot, <drivers/mtd/nand/ti81xx_nand.c>

    Thanks Avinash

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  • Lihua Zhu
    Posted by Lihua Zhu
    on Sep 23 2012 21:47 PM
    Intellectual820 points

    Hi Avinash,

    Thank you for the quick reply.

    Best regards,

    Lihua

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