[OpenBIOS] Starting linux aint much easy ?

Ronald G. Minnich rminnich at lanl.gov
Tue Feb 15 14:15:48 CET 2000


On Tue, 15 Feb 2000, Attarian, Gary wrote:
> Well after all that hair pulling (of course) I found the
> kernel/arch/i386/boot/setup.S file.  This is the code which jumps to Linux
> from a floppy boot.  Take a look in there especially the code preceding the
> code32: label.  Your jump to 0x101000 has to have the 0x66 prefix or the
> last bit of protected mode will not truly be set up.  What that means
> essentially, is that the code segment register will not be pointing to the
> appropriate location in the GDT.  While some of the code may run, as soon as
> head.S trys to jump to another segment the processor will generate a GPF.  


BE CAREFUL. openbios sets the processor up with a gdt already, in 4GB
address space. 


ron

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