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AM3517: Writing 4-bit BCH-ECC with Lauterbach

Ludwig Zenz
Intellectual 820 points

Hello,

 

I want to write uboot.bin to nandflash with the lauterbach debugger. That works but i can not write the 4-bit BCH-ECC to the spare-area.

 

A solution would be to generate the ECC on the PC an write it with the debugger into the nandflash spare area. But i did not find a tool to generate the 4-bit BCH ECC.

 

I tried to make one by myself but did not find a detailed description about calculating the ECC. Informations like used polynom ... would be neccessary.

 

Thank you for your help.

  • 0
    TI__Expert 8180 points

    Any specific reason, why you want to flash it using lauterbach only? Since u-boot itself supports BCH4 ECC schema, you can verywell download u-boot into DDR memory and run u-boot. Then from u-boot prompt you can chose ecc schema and flash u-boot.bin to NAND.

    Thanks,

    Vaibhav

  • 0 in reply to Vaibhav Hiremath
    Intellectual 820 points

    You´re right that is possible if you are having a running u-boot.  But i want to run u-boot on our own board. Flashing u-boot into NAND with u-boot does not work, yet.

  • 0 in reply to Ludwig Zenz
    TI__Intellectual 1505 points

    Are you hoping to use the JTAG to prove the hardware is sane, if the data is written outside of U-Boot (and thus you have a software bug in u-boot to solve) ?  If you can't load u-boot into DDR memory and then use that to write to flash you might well have problems with whatever is to be loading u-boot from NAND itself too (I'm assuming your path goes romcode->first stage loader (for example x-loader) -> second stage loader (for example u-boot).

  • 0 in reply to Tom Rini
    Intellectual 820 points

    In the meantime it is possible to write u-boot by itself to the nand-flash. Some adjustments in the gpmc settings solved this problem.

    But i am still interested to do this the comfortable way that means with a lauterbach script. This would be a big advantage especially when i have to program a bigger count of modules.

     

    Thank you for your answers!

    (Sorry for the long time since my last post, some urgent projects interrupted this one.)

  • 0 in reply to Ludwig Zenz
    Expert 2060 points

    Hello ,

    My suggestion is, why don't you try using flash tool to flash u-boot image into the nand flash.

    There also you 'll get choosing different ecc options i.e 1-bit, 4-bit, 8-bit ecc.

    Just try with this, just you need to set all the gpmc registers required for nand timings by refering nand datasheet.

     

    Regards,

    santosh vastrad

     

  • 0 in reply to santosh vastrad
    Intellectual 820 points

    Hello Santosh Vastrad,

    We have no switches on our module to change the boot-pin states. So i would have to pick my soldering iron to change these. I don´t want to do that.

    Thanks anyway!