2017-01-11 19:45 GMT+03:00 Andrei Borzenkov <[email protected]>:
> 11.01.2017 16:27, Matwey V. Kornilov пишет:
>> Hello,
>>
>> What is the proper way to output GRUB2 menu to serial rs232 console when
>> UEFI boot is used? I've copy-pasted GRUB_SERIAL_COMMAND="serial --unit=0
>> --speed=115200" from Google because I didn't find anything else. It
>> doesn't work.
>> Now, reading grub sources, I see that the proper way should probably be
>> something like GRUB_SERIAL_COMMAND="serial efi0".
>>
>
> This is platform dependent. --unit=0 refers to COM1 on PC BIOS platform.
> On EFI grub is using EFI Serial I/O Protocol and enumerates all handles
> with this protocol using efiXX names. Then there is USB serial driver,
> ARC and IEEE1275 where names are provided by firmware etc.
I just can't understand, term/serial.c: grub_cmd_serial() sets name to
"com%ld" using --unit=value on any platform.
if (state[OPTION_UNIT].set)
{
grub_snprintf (pname, sizeof (pname), "com%ld",
grub_strtoul (state[0].arg, 0, 0));
name = pname;
}
Then this "com0" is put to grub_serial_find(name) call. The question
is how this is going to match with "efi0"?
Please correct me, if I am wrong.
>
>> Could you please point me to proper documentation?
>>
>
> You are welcome to contribute to it. Adding template section for
> platform dependent serial information and filling it with information
> known so far will be excellent - then other may extend it.
--
With best regards,
Matwey V. Kornilov
http://blog.matwey.name
xmpp://[email protected]
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