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400D Bootloader

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Offline owerlord

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    400D Bootloader
    « on: 21 / June / 2008, 11:12:44 »
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    Sekhl asked for my IDA database of bootloader, to here it is:


    In the attachement :-)
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    Offline Seklth

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    Re: 400D Bootloader
    « Reply #1 on: 22 / June / 2008, 15:09:25 »
    thanks, and this my version, with info from you)
    and my nick - Seklth, not Sekhl  ;)
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    Offline Seklth

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    Re: 400D Bootloader
    « Reply #2 on: 29 / June / 2008, 19:26:30 »
    I called from autoexec.bin functions cfata_init, file_open(name,2), file_close, cfata_end. And it creates file on cf. Now I can't find how write data to file, but if it possible - we can do project 'udumper-eos':-)
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    ASalina

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    Re: 400D Bootloader
    « Reply #3 on: 29 / June / 2008, 20:58:41 »
    Quote from: Seklth on 29 / June / 2008, 19:26:30
    I called from autoexec.bin functions cfata_init, file_open(name,2), file_close, cfata_end. And it creates file on cf. Now I can't find how write data to file, but if it possible - we can do project 'udumper-eos':-)

    Lots of functions read unk_26200 for a function pointer, like this:

    Code: [Select]
    _entry_

    LDR     R5, =unk_26200
    LDR     R3, [R5]
    .........................
    CMP     R3, #0
    .........................
    BEQ     _exit_
    MOV     LR, PC
    MOV     PC, R3

    _exit_

    RET

    But none of them ever store a function pointer into unk_26200.
    I wonder what stores data into unk_26200...
    I'm trying to find out now.

    Edit: I'm sorry, I slightly misread the code. The function does not exit, but 0x26200 optionally has some set-up and follow-up routine that is executed if not NULL. Still, nothing seems to set that address with a function pointer.
    « Last Edit: 29 / June / 2008, 21:13:52 by ASalina »
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