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  2. Fórumok
  3. Notebookok
  4. ThinkPad T, X, A és W notebookok
  5. (téma lezárva)
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  • #280 BFeco aktív tag predy_ #278
    #280
    Összes hozzászólása itt Válaszok az összes hozzászólására itt Válaszok erre a hozzászólásra
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    BFeco

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    válasz predy_ #278 üzenetére

    Pentium-M-es Thinkpad Centrínósítás
    2005. ápr. 23., szombat - 0:57 [link]

  • #279 BFeco aktív tag predy_ #278
    #279
    Összes hozzászólása itt Válaszok az összes hozzászólására itt Válaszok erre a hozzászólásra
    Privát üzenet küldése

    BFeco

    aktív tag

    válasz predy_ #278 üzenetére

    In recent IBM thinkpad systems, there is a limit to allowed MiniPCI wireless
    cards. When an unauthorized card is plugged in, the system doesn't boot and
    halt with an error message like:

    ERROR
    1802: Unauthorized network card is plugged in
    Power off and remove the miniPCI network card.

    I met this 1802 error problem one year ago, and since then my wifi card was
    used in a very clumsy and inconvenient way.
    I used to boot to LILO menu or Windows system first, then suspend and plug
    in the card. After that, when the system is awake, the card is working.

    Recently, I learned two solutions to attack this problem. One is to crack
    the BIOS by modifying the PCI_ID list of allowed cards in the BIOS, as
    suggested by Paul Sladen and Matthew Garrett.
    Reference: http://www.paul.sladen.org/thinkpad-r31/wifi-card-pci-ids.html

    The other way is unbelievably simple. There is a byte in CMOS which controls
    whether an ''unauthorized'' card is allowed or not. That's 0x6a, actually only
    the bit 0x80.
    The program to unlock is like:

    MOV DX,0070
    MOV AL,6A
    OUT DX,AL
    MOV DX,0071
    IN AL,DX
    OR AL,80
    OUT DX,AL
    MOV AX,4C00
    INT 21

    The program can be downloaded from:
    http://jcnp.pku.edu.cn/~shadow/1802/no-1802.com
    To use this program, you need to boot to DOS.

    The CMOS solution is safe, but I'm not sure that it works for all recent
    thinkpads and all cards. The BIOS crack sure does, however that is difficult
    and dangerous.

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