Help with reading/writing FLASH

(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:

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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)

  • formatting link
    RICOH348A, oscilator MB40C368PF, A/D 1CH, 8bit, 18Mhz F29DL324BE-90PFTN, Fujitsu 32Mbit FLASH memory
  • formatting link

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.


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