Re: Debugging the linuxBIOS code

[Andrew Ip]

Deepak,
> Thanks. I like this list for it's good responses.
> Could you please elaborate on "POST card", what is it exactly ?
> You are correct, I do not have a simulator.

It is a PCI card which displays the value of port address 80.  In
LinuxBIOS source, it is not hard to find, eg.

intel_chip_post_macro(0x11)

It will dump 0x11 to port 80, and POST card will display 11 on its
LED.

While debugging, you can record the value and search thru the source
to see where LinuxBIOS hangs.  However, you can't do backtracing with 
this device.

-Andrew

Debugging the linuxBIOS code

[Deepak Kotian]

Thanks for the information, Andrew.
Correct, this would be good in case machine hang.
But still it should be very useful.

May be in future , a smart
"POST code" could have some small internal buffering
with some kind of manual switch to move up and
down the display to track the code.
This may or may not sound sense , but just a thought.

Regards
Deepak

----- Original Message -----
From: "Andrew Ip" 
To: 
Cc: ; ;

Sent: Wednesday, April 23, 2003 11:34 AM
Subject: Re: Debugging the linuxBIOS code
> Deepak,
> > Thanks. I like this list for it's good responses.
> > Could you please elaborate on "POST card", what is it exactly ?
> > You are correct, I do not have a simulator.
>
> It is a PCI card which displays the value of port address 80.  In
> LinuxBIOS source, it is not hard to find, eg.
>
> intel_chip_post_macro(0x11)
>
> It will dump 0x11 to port 80, and POST card will display 11 on its
> LED.
>
> While debugging, you can record the value and search thru the source
> to see where LinuxBIOS hangs.  However, you can't do backtracing with
> this device.
>
> -Andrew
>
> Cwlinux Limited
> Unit 202B 2/F Lai Cheong Factory Building,
> 479-479A Castle Peak Road,
> Lai Chi Kok, Kowloon,
> Hong Kong.
>
> Tel: [phone]
> Fax: [phone]
>
> For public pgp key, please obtain it from http://www.keyserver.net/en.

Debugging the linuxBIOS code

[ron minnich]

On Wed, 23 Apr 2003, Deepak Kotian wrote:
> May be in future , a smart
> "POST code" could have some small internal buffering
> with some kind of manual switch to move up and
> down the display to track the code.
> This may or may not sound sense , but just a thought.

I think it would cost too much :-)

ron