[coreboot] Serial input / output with SeaBIOS 1.11.0

[Piotr Król]

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On 01/18/2018 10:38 PM, Piotr Kubaj via coreboot wrote:
> Hi,

Hi Piotr,

> 
> I've upgraded my coreboot to tag 4.7. As a payload I use SeaBIOS. I
> want to use the new feature of serial communication from SeaBIOS.
> The issue I have is that there's only serial output (meaning I can
> see the SeaBIOS menu on serial), but pressing any key on keyboard
> via serial doesn't do anything - I can only control SeaBIOS via
> keyboard plugged directly to the board, not via serial.
> 
> Does anyone have the same issue? I use AsRock E350M1 board. I
> didn't create a custum SeaBIOS config, I just use the default one.

I'm not sure if you solved your issue, but on BayTrail I saw the same
issue. Giving SeaBIOS information where default serial IO memory is
worked for me. You can do it using cbfstool and modifying existing
coreboot.rom:

./cbfstool coreboot.rom add-int -i 0x3f8 -n etc/sercon-port

Please note that in rare cases address of your serial may be
different. You can verify it when booting Linux and checking dmesg:

[2:09:31] pietrushnic:~ $ sudo dmesg|grep ttyS0
[    0.627278] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200)
is a 16550A

I believe BSD has alternative. Typical addresses are:

ttyS0 address 0x3f8
ttyS1 address 0x2f8
ttyS2 address 0x3e8
ttyS3 address 0x2e8

Hope this help.

Best Regards,
- -- 
Piotr Król
Embedded Systems Consultant
https://3mdeb.com | @3mdeb_com
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