13.01.2017 12:03, Matwey V. Kornilov пишет: > 2017-01-11 20:16 GMT+03:00 Andrei Borzenkov <arvidj...@gmail.com>: >> 11.01.2017 19:55, Matwey V. Kornilov пишет: >>> 2017-01-11 19:45 GMT+03:00 Andrei Borzenkov <arvidj...@gmail.com>: >>>> 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"? >> >> It is not. >> >>> Please correct me, if I am wrong. >>> >> >> Again - "--unit=0" is simply alias for "com0". Whether device with name >> "com0" actually exists depends on platform and loaded drivers. >> >> This alias makes no sense on platform that does not include ns8250 >> driver that provides access to device with name "com0". You can check >> grub-core/Makefile.core.def which platforms include this driver. >> >> So on EFI you are not going to use --unit=0 (or you need to add some >> platform-dependent magic to translate --unit=0 into platform device). >> >> And yes, this could use better documentation, both for "serial" command >> and "Serial terminal" section. > > Thank you. > "serial --speed=115200 efi0" also doesn't work.
Please define "does not work". What you expect it to do and how you verify it? > It seems that there is no Serial IO protocol in my Insyde UEFI. > What is output of "terminal_input" and "terminal_output"? _______________________________________________ Help-grub mailing list Help-grub@gnu.org https://lists.gnu.org/mailman/listinfo/help-grub