[coreboot] SeaBIOS debug output

[Carl-Daniel Hailfinger]

On 20.07.2008 22:57, ron minnich wrote:
> On Wed, Jul 16, 2008 at 6:47 PM, Kevin O'Connor <kevin at koconnor.net> wrote:
>   
>> Hi Myles,
>>
>> On Wed, Jul 16, 2008 at 07:29:29PM -0600, Myles Watson wrote:
>>     
>>>> Finding the option roms is easy - they are located between 0xc0000 and
>>>> 0xe0000 and are 2KiB aligned.
>>>>         
>>> That can be true after Coreboot copies them there.  Devices which have
>>> option ROMs on the card are located somewhere in the PCI address space until
>>> they are copied.  On-board devices have their option ROMs contained
>>> somewhere in the BIOS chip.
>>>       
>> Right.  I'm a proponent of having coreboot be responsible for copying
>> the option roms to their locations in ram.  Once coreboot loads the
>> option roms then seabios can easily locate and run them
>
> you're assuming they would all fit at one time into 64k. Not
> necessarily the case. What has to happen is copy (or map) the rom, run
> it, remove it, and so on. At least that's how I remember it working.
> It was easier in the emulator as the copy step is not needed.
>   

If any of the option ROMs install interrupt handlers (video etc.) they
may have to remain in memory after being run.


> Whatever happens with this discussion, we still need to be able to run
> with things like linux as payload and seabios not there. At linuxworld
> next month, at least one booth will be showing Intel's rapidboot,
> which we all know as linux-as-booloader.
>
> intel is showing that linux can be used as a bootloader. I wish they'd
> gotten the memo 10 years ago but better late than never.
>   

The most interesting thing about this is that they must have figured out
a way to boot Windows from Linux. Maybe some of their code can be reused
for SeaBIOS.

Regards,
Carl-Daniel

-- 
http://www.hailfinger.org/