"leilei" wrote:
> I am writting a program for target board which have a 486 cpu, 512K
> ram(0x0 to 0x7ffff), 512k flash (0x80000 to 0xFFFFF).My program will
> be burned into flash.
> My program is to initialize the GDT, IDT, TSS, move them to memory.
> Now I can enter protected model and mov GDT, IDT correctly.But when I
> am about to mov TSS, some exception came out, and the CPU reset
> automaticly. The code casue the problem is like this:
> mov cx, gdt_idx
> mov gs, cx
> when cpu run to the instuction 'mov gs, cx', CPU will reset.
> i can assure the value in cx is correctly.
A MOV GS, with whatsoever value wont raise an exception except
if the CPU don't got a GS (EXCeption06 on x286 and previous).
512 KB RAM ? mmh, are you sure you have a 486 CPU ?
__
wolfgang
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