[coreboot] Getting serial output from w83627hf?

Alp Eren Köse alperenkose at buyutech.com.tr
Tue Oct 18 16:06:16 CEST 2011


> Are you able to use the serial port when the vendor BIOS/(U)EFI image is
used?
Yes I can get output if I append the following to the kernel line in grub:
console=ttyS0,115200 console=tty0

And I have also set the show POST codes on the debug console but it doesn't
produce anything either..


2011/10/18 Idwer Vollering <vidwer at gmail.com>
>
>
> 2011/10/18 Alp Eren Köse <alperenkose at buyutech.com.tr>
>
>> > Found Winbond W83627HF/F/HG/G (id=0x52, rev=0x41) at 0x2e
>> > Register dump:
>> > idx 02 20 21 22 23 24 25 26  28 29 2a 2b 2c 2e 2f
>> > val ff 52 41 ff fe c0 00 00  00 00 fe c0 ff 00 ff
>> > def 00 52 NA ff 00 MM 00 00  00 00 7c c0 00 00 00
>> >
>> >
>> > CR24 (idx 24, in the above output) means control register 24, here is a
>> link to the
>> > superio's datasheet: http://www.itox.com/pages/support/wdt/W83627HF.pdf
>>
>> Ok, I got it, but doesn't CR24 is set inside the w83627hf_set_clksel_48()
>> function..
>>
>
> Yes it is, bit 6 (in control register 24), is raised in
> w83627hf_set_clksel_48() .
> http://review.coreboot.org/gitweb?p=coreboot.git;a=blob;f=src/superio/winbond/w83627hf/early_serial.c
>
>
>> I still got no output from the serial unfortunately? :(
>>
>
> Are you able to use the serial port when the vendor BIOS/(U)EFI image is
> used?
>
> --
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>
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