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cosmo83
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Joined: 08 May 2008
Posts: 2
Location: FRANCE
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 Posted: Thu May 08, 2008 8:56 pm Post subject: T40 TCPA disable |
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Hello,
I have purchased one used T40 motherboard but the Security chip was missing and the board is really requiring it. As a result it beeps on init. After putting another TCPA chip grabbed from another T40 board, the systems starts but fails while indicating error 0192. No way to disable it thru BIOS menu.
It is possible to disable security chip check and to avoid to use the chip by writing somewhere inside the 24RF08 or reflashing the BIOS ? Any help will be apreciated.
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victor
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Joined: 07 Mar 2004
Posts: 2581
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| Posted: Fri May 09, 2008 12:26 am Post subject: |
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is believed that the BIOS code contains a signature that matches the TCPA chip. They are making a "couple". The idea is to edit the BIOS by removing the TPCA section, then adjust the checksum and cook it back, or to flahs a BIOS from a non TCPA board (an earlier model). There are some topics on the subject, one could be this:
http://www.allservice.ro/forum/viewtopic.php?t=337&postdays=0&postorder=asc&start=0
And, no, I do not have the non TCPA BIOS, as someone suggested. Parole d'honneur!
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Victor Voinea
ALLservice HQ, Romania. |
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cosmo83
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Joined: 08 May 2008
Posts: 2
Location: FRANCE
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| Posted: Mon May 12, 2008 9:00 pm Post subject: |
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Thanks Victor,
I read carefully the link that you recommended, which was very helpful. I tried also to swap the Components from another (secured) board for scrapp and it works. Conclusion : It is mandatory to swap the BIOS flash EEP(U15), the 24RF08 (U53) and also the 93C46 (U3) that contains the MAC Address, which is part of the computation algorithm of unique "id" attached to the board. Of course it should be more simple to flash a new non TCPA BIOS, it seems to be feaseable but I have not the way to proceed to flash it "in-situ".
Some sellers are proposing motherboards on Ebay that are said to be reprogrammed this way, I do not know how they proceed, may be it is possible to access the program/data pins while putting the rest of logic in high-Z and programming it from a standard HW programmer. Or either by a "flasher boot" downloaded and executed in RAM? Who knows ?
Hope it will help.
Salut. |
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victor
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| Posted: Mon May 12, 2008 9:24 pm Post subject: |
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OK, only to mention that MAC address is stored in 24RF08. The UUID is also in the 24RF08 and those two do not affect the TCPA and BIOS marriage at all. So is not the UUID nor MAC.
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Victor Voinea
ALLservice HQ, Romania. |
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Glycerin
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Joined: 23 Apr 2010
Posts: 2
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| Posted: Fri Apr 23, 2010 1:48 am Post subject: Thinkpad T40 Security Chip |
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| victor wrote: | | OK, only to mention that MAC address is stored in 24RF08. The UUID is also in the 24RF08 and those two do not affect the TCPA and BIOS marriage at all. So is not the UUID nor MAC. |
I know this is a little late after the last post and I hope you read it.. I have a Thinkpad T40 with a problematic GPU that causes the laptop to freeze when moved around. I got another motherboard that works perfectly but it has no security chip. My question is, if I move the security chip and solder the 24RF08 chip from the bad motherboard to the good one, will it work, or will I still get a security tamper error message? Thanks! |
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victor
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| Posted: Fri Apr 23, 2010 2:26 pm Post subject: |
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Not quite.
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Victor Voinea
ALLservice HQ, Romania. |
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Glycerin
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Joined: 23 Apr 2010
Posts: 2
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| Posted: Fri Apr 23, 2010 4:29 pm Post subject: |
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| Thanks for the quick reply. Well then, I guess I won't bother to try. |
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Martin281
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Joined: 01 Dec 2008
Posts: 4
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| Posted: Thu Feb 24, 2011 6:18 pm Post subject: Security chip + right BIOS chip changed - error 0192 still |
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| victor wrote: | is believed that the BIOS code contains a signature that matches the TCPA chip. They are making a "couple". The idea is to edit the BIOS by removing the TPCA section, then adjust the checksum and cook it back, or to flahs a BIOS from a non TCPA board (an earlier model). There are some topics on the subject, one could be this:
http://www.allservice.ro/forum/viewtopic.php?t=337&postdays=0&postorder=asc&start=0
And, no, I do not have the non TCPA BIOS, as someone suggested. Parole d'honneur! |
Hi there!
I had a good board that wrote error 0192 when booting since the TCPA chip missed, I got dead T40 board with right security chip. I tried to solder BIOS chip (U53) and also use the security chip from the dead board to the working one, but the error 0192 is still there on booting. Whats wrong then since both chips paired up were changed?? Thanks. |
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victor
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| Posted: Thu Feb 24, 2011 7:11 pm Post subject: |
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Bios from the "dead" board was also not original or was corrupted - that's why it was dead maybe.
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Victor Voinea
ALLservice HQ, Romania. |
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Reo51st
Cont inchis
Joined: 09 Jun 2009
Posts: 77
Location: St. Petersburg
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