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SubjectRe: For comment: draft BIOS use document for the kernel
** Reply to message from Alan Cox <> on Fri, 22 Jun
2001 17:20:33 +0100 (BST)

> Firstly a call is made to BIOS INT 15 AX=0xE820 in order to read the
> E820 map. A maximum of 32 blocks are supported by current kernels. The
> 'SMAP' signature is required and tested. In addition the SMAP signature
> is restored each call, although not required by the specification in order
> to handle some know BIOS bugs.

FYI, in OS/2, the E820 call is made only on machines with a Pentium Pro or
higher, because apparently (and this is my guess) there are some motherboards
out there with older CPUs that don't return a reliable result to the E820 call.

Timur Tabi -
Interactive Silicon -

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