[LinuxBIOS] Problem to Support SuperIO Winbond W83977AF

Corey Osgood corey_osgood at verizon.net
Mon Apr 16 12:25:41 CEST 2007

ccases at navista.fr wrote:
>> Do you have a POST card? If so, set up a post code at the start of
>> w83977af_early_serial() so you can make sure LinuxBIOS is in fact making
>> it that far. Do a post code with outb(0x[code], 0x80);
> For this question the POST is Power-On Self-Test, but I don't know what is
> the POST card !!!

POST codes are codes sent to port 0x80 while the computer is booting
(POST-ing), which can then be detected by an ISA or PCI card, and
usually are displayed on an LCD screen. Like this one:

They're also sometimes called PCI debug cards or port 80 debug cards.
And you can get them for much cheaper than the one I linked to, I spent
like $9 on mine on ebay, with shipping.


More information about the coreboot mailing list