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• #279 BFeco aktív tag predy_ #278

  2006-03-18 23:27:38 #279

  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

  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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