Linus On The Extensible Firmware Interface
A recent patch posted to the lkml contained the following description, "this patch adds an efi e820 memory mapping", in response to which Andrew Morton [interview] asked, "why?". Linus Torvalds offered his views on EFI, the Extensible Firmware Interface beginning by describing it as "this other Intel brain-damage (the first one being ACPI)". EFI is a replacement for BIOS, originally designed for use on the ia64 architecture though since adopted by other computers, including Apple's Intel-based Macs. Linus went on to explain, "the original EFI code in the kernel basically duplicates all the BIOS interfaces (ie everything that looks at a memory map comes in two varieties: the normal and tested BIOS e820 variety, and the usually broken and hacked-up EFI memory map variety). Translating the EFI memory map to e820 is very much the sane thing to do".
Linus continued in a followup email.
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