tweak CMOS settings

This is a discussion on tweak CMOS settings within the Windows Programming forums, part of the Platform Specific Boards category; Hi, This is wound weird but I would like to know, can I write a C-Program call it test.exe to ...

  1. #1
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    Lightbulb tweak CMOS settings

    Hi,
    This is wound weird but I would like to know, can I write a
    C-Program call it test.exe to change the CMOS settings while I'm in a Win32 Enviroment?

    Only while in Win32 Environment.

    I try to do this thorugh a dos-prompt, it can be done.
    The list was updated successfully. But when I reboot my system,
    I went into CMOS but the default value just before the modification was being restored.

    Is this possible to do it?
    thanks.

    p/s: running on WinXP platform.

  2. #2
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    WinXP will not allow you to access the cmos memory unless you are a driver or a ring 0 application. Best methods are complicated to get right and it's very easy to crash your system as you no longer have the safe guards WinXP puts in place for you - if your program crashes, so does Windows.

    Did your dos program update the cmos checksum? If not, that would explain why it reverted on a restart.

  3. #3
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    Hi Elixia,
    I have the CKSUM program to check for the BIOS Checksum.
    It was done successfully. When I reboot my computer, BIOS did not crash, it was normal but the settings that I required to change are not being set.

    thanks.

  4. #4
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    So how are you trying to change the values? Just as most modern bios's are write protected by default and require a special sequence to unlock (as bios developers have decided that the bios should never be changed by user code - only by the bios itself). Are you doing this sequence?

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