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I spend a lot of time scanning/reading the IA32/IA64 Manual PDFs which are freely available from Intel.

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I had used the open-source tools that can split/recombine the older Phoenix BIOS images and that gave me a lot of understanding of how they are structured by reading the source-code.

Knowing how the Power On Self Test sequence of a PC works is critical as is understanding the standard BIOS calls via software interrupt that were a mainstay of the DOS era.

For that it is usually a case of Googling for clues as to what others use.

That's how I discovered I needed Phoenix BIOS Editor.

I knew the MSR register I was interested in was 0x3A so I could work out the opcode of the instruction "WRMSR 0x3A" and then search for it within all the BIOS code I had.

For this you need the manufacturers CPU manuals that detail the opcodes to hand.The first problem I encounted was that I didn't have a . This was easily solved once I found out that the BIOS chip is memory mapped just below 4G.I wrote a simple C program that dumps this area using /dev/mem on Linux.The Mac community has found a way to enable VT in Mac Books Pro via EFI patching. I just found this thread which made your intention clearer to me: I thought I'd reply to your private-message question here because it is one I get asked frequently and I might as well write it once and let others find it at their leisure On your point about the manufacturers restricting features - part of the joy of the open-source world focused around GNU/Linux and BSD is that it is possible if you're determined enough to take back control of your PC and make sure it does what you intend, not what some cost/benefit analysis of the manufacturer's likely support costs has dictated!t=361236&page=3 I would like to help but as I have no suitable hardware yet I will be of limited use. I would like to experiment a bit myself with that BIOS issues.Using "ndisasm" I have disassembled all modules and found lots of RDMSR/WRMSR instructions.

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