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

Myles Watson mylesgw at gmail.com
Thu Sep 17 21:23:02 CEST 2009

2009/9/17 Antonio Expósito <antonio.exposito at ono.com>

>  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
> serial?
> Is there any way to convert LPC to serial and monitor that port?
I don't know of an easy way.

> I want to do this with a VIA P700 motherboard, is this board supported by
> the coreboot v3?
I don't think so.  Coreboot v2 is the most active branch.

> Could be easy to redirect BIOS POST codes to a serial port using a coreboot
> implementation?
Coreboot sends debug information to the serial port, so there is no need for
monitoring the POST codes except very early in the boot process.

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