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----- Original Message ----- From: Stefan Reinauer firstname.lastname@example.org To: email@example.com Sent: 10 February 2000 15:32 Subject: RE: [OpenBIOS] PC-CMOS memory..
Is there a secure way to access anything in the CMOS over 128 bytes? I
some patches for the Linux nvram driver a long time ago to access not only
bytes, but 128 bytes. I read somewhere that everything over 128 bytes has to be accessed over io registers 0x72 and 0x73 instead of 0x70 and 0x71. Has anyone
I'm not sure what you mean by 'secure', do you mean consistent?
0x72 and 0x73 do seem to be the method for accessing the upper 128-bytes of CMOS but I'm not aware of any 'standard'. These days the CMOS is often on the South Bridge of the chipset so you need to check the individual data sheets, (its a while since I programmed a discrete NVRAM), some of the chipsets have locks and other enables so it is wise to check the data.
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