[coreboot] BIOS POST codes monitoring in real time from other computer

Antonio Expósito antonio.exposito at ono.com
Thu Sep 17 21:13:29 CEST 2009

Hi all,


I don’t want to disturb you with “newbie things”, but this is a way to start
like another.


I am trying to monitor the boot process of a computer, mainly BIOS POST
codes and linux kernel boot process. I know how to do it for the linux
kernel using a serial port, but I am not able to imagine how to monitor the
BIOS POST codes.


I know that almost every BIOS sends them to the ISA I/O address 0080h, but,
how can I get that codes using another computer? I mean,  without POST
ISA/PCI card, using another computer connected to it via SMBUS, LPC or


Is there any way to convert LPC to serial and monitor that port?


I want to do this with a VIA P700 motherboard, is this board supported by
the coreboot v3?


Could be easy to redirect BIOS POST codes to a serial port using a coreboot


Thanks in advance,




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