Hi Peter and Rudolf. Thanks for the answers and tips. They are realy helpfull ! I'll take a look.
Rafael R. Machado Em Sáb, 9 de jan de 2016 17:19, Rudolf Marek <r.ma...@assembler.cz> escreveu: > Hi, > > I guess your question is more general than the coreboot related right? > > If you have a firmware image dump of the flash (not the file you download > from > board vendor) then yes, first location to be executed is the instruction > located > 16 bytes before end of the image. > > In coreboot see in build/ bootblock_inc.S which also has reset16.inc and > entry16.inc which is a real start. Consult the Intel or AMD manual to see > the > CPU state after reset. The CPU starts in real mode, but CS base is shifted > to > last 64KB before end of 4GB address space. In general your CPU starts in > compatible mode with 8086 manufactured in 1978. > > Thanks > Rudolf >
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