On Sat, 24 Apr 2004, Ralf Baechle wrote: > > That precludes the firmware from being run cached, though. Not very > > nice, especially for callbacks, but perhaps a bit easier to deal with. > > Sane firmware copies itself to RAM at the earliest possible stage anyway - > ROMs are way too slow. Indeed, though it excludes the RAM used from the OS control (unless the OS wants to block itself from the access to callbacks). FYI, DEC copies only the bits it currently needs (and e.g. option ROMs typically cannot be directly executed at all as they often are 8-bit, but return word-aligned data) and when booting the OS certain callback vector entries point to RAM and others to ROM. -- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@xxxxxxxxxxxxx, PGP key available +
