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Help with reading/writing FLASH

Discussion in 'Beginner Electronics' started by ynezz, Jan 13, 2005.

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  1. ynezz

    ynezz Guest

    (copy of email sent to linuxsh-dev)


    Hi all,

    I would like to port Linux on one embedded device, it's handy barcode
    scanner.

    I've made a scan of the both sides of the PCB board, it's available on:

    http://hysteria.sk/~petr/denso/bht_8000_side1.jpg
    http://hysteria.sk/~petr/denso/bht_8000_side2.jpg


    I've found the docs to all ICs on the board except one in the top right
    corner
    on side2 of the board(I think that it have to do something with LCD?).
    Here is
    the list of ICs and manuals I've found:

    side1: Just a CPU, SH3(7706), docs available from Renesas
    side2: TC55V400, Toshiba 4Mbits static RAM(SRAM)
    * http://hysteria.sk/~petr/denso/tc55v400.pdf
    RICOH348A, oscilator
    MB40C368PF, A/D 1CH, 8bit, 18Mhz
    F29DL324BE-90PFTN, Fujitsu 32Mbit FLASH memory
    * http://hysteria.sk/~petr/denso/MBM29DL324BE-90PBT.pdf


    I know that I need to port sh-ipl+g on it first, but I get stuck at
    this point,
    because first of all I need to know how to read/write the
    SRAM(TC55V400, I hope
    that the firmware is stored there). I would like to make a backup of
    the firmware
    and replace it with sh-ipl+g. I've spent like 2 days finding how to
    make some
    kind of read/write interface(RS232/JTAG/LPT) but without success.

    After that, it would be fun to get working LCD, keyboard, barcode
    device, infra.
    Is there any similiar board around to which was linux-sh ported? So I
    can get
    ideas or whatever.

    It would be nice and really helpful for me to get some ideas, URLS,
    docs or
    whatever. It isnt much info available on net about this.
    Thank you.

    ynezz
     
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