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

WANG FEI wangfei.jimei at gmail.com
Wed Jan 14 11:29:15 CET 2015


Changing the seabios serial port base address, you should modify it via
"make menuconfig" command, it's much easy and efficiency.

It's not recommended to modify the actual source files.


On Tue, Jan 13, 2015 at 3:33 AM, Martin Roth <gaumless at gmail.com> wrote:

> 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.
> Martin
> 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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