ADLO: no serial output after sti in loader.s

Simon Xin Cheng scheng at
Fri Jul 23 18:57:00 CEST 2004


I am working on booting Linux from hard disk with VGA support on an EPIA 
board. I am using ADLO to load video bios and bochs bios.

I found an interesting thing. The last two instructions in the loader.s 
of ADLO is :

jmp 0xFFFF:0x0000

I turned DEBUG_SERIAL on in rombios.c. But I can not see any debugging 
information through serial port after the jumping.

However, if I commented out the sti, I can see all debugging 
information. So what is the problem with the sti? Are there any 
LinuxBIOS interrupt service routines that never return back?


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