[coreboot] SeaBIOS, serial output, grub, sgabios does not seem to load

Martin Roth gaumless at gmail.com
Tue Jan 13 04:33:40 CET 2015

Hi Viktor,
   Yes, I think having option roms checked is probably required. The 
only other thing I'd recommend is to build SeaBIOS outside of the 
coreboot structure and pull it in as an elf payload.  Building within 
coreboot is handy, but it doesn't offer the flexibility or control that 
you get building it yourself.


On 01/12/2015 01:50 AM, Kuzmichev Viktor wrote:
> On 11.01.2015 07:45, Martin Roth wrote:
>> On 01/10/2015 07:53 AM, Kevin O'Connor wrote:
>>> On Thu, Dec 25, 2014 at 11:45:40AM +0300, Kuzmichev Viktor wrote:
>>>> Hello,
>>>> I've been trying to boot grub installed on the hard drive using 
>>>> coreboot and
>>>> SeaBIOS as a payload. The motherboard I'm using is Intel Mohon 
>>>> Peak. Also, I
>>>> do not use VGA for output, only serial port. So, I included the 
>>>> sgabios into
>>>> my rom file. Here is its layout:
>>> It should have worked.  How did you build SeaBIOS, what SeaBIOS config
>>> did you use, and what changes have you made to SeaBIOS?
>>> -Kevin
>> As I recall, Mohon Peak uses 0x2f8 for the console serial port. Did 
>> you set sgabios to output to 2f8 instead of 3f8 in sgabios.h?
>> sgabios.h:#define COM_BASE_ADDR           0x3f8
>> Martin
> Thank you for your replies!
> Just checked sgabios.h and changed serial port base address to 2f8. 
> Somehow I missed it earlier, although I did set this parameter in both 
> coreboot and SeaBIOS before. Sadly, I do not currently have access to 
> Mohon Peak, so I can't really test this right now but, hopefully, I 
> would be able to test this in a few days.
> Also, I'd like to clarify one more thing. Should Option ROMS parameter 
> in SeaBIOS menuconfig be checked for sgabios to work? Are there any 
> other nuances I should keep in mind?
> Viktor

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