bug#26875: [v2] system: grub: Expose GRUB's interactive interface settings.

[Leo Famulari <leo@famulari.name>]

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On Sat, May 13, 2017 at 03:51:27PM +0200, Ludovic Courtès wrote:
> > +@item @code{terminal-outputs} (default: @code{'gfxterm})
> > +The output terminals used for the GRUB boot menu, as a list of symbols.
> > +These values are accepted: console, serial, serial_@{0-3@}, gfxterm,
> > +vga_text, mda_text, morse, spkmodem
> 
> Please use @code for the possible, add a final period, and a
> cross-reference to the relevant part of the GRUB manual with
> “(@pxref{…})” if possible.

Okay!

> 
> > +@item @code{terminal-inputs} (default: @code{'()})
> > +The input terminals used for the GRUB boot menu, as a list of symbols.
> > +The default is the native platform terminal as determined by GRUB at
> > +run-time.  These values are accepted: console, serial, serial_@{0-3@},
> > +at_keyboard, usb_keyboard.
> > +
> > +@item @code{serial-unit} (default: @code{#f})
> > +The serial unit used by GRUB, as an integer from 0 to 3.  The default
> > +value is chosen by GRUB at run-time; currently GRUB chooses 0, which
> > +corresponds to COM1.
> 
> Likewise.

Yes!

> 
> > +@item @code{serial-speed} (default: @code{#f})
> > +The speed of the serial interface, as an integer.  The default value is
> > +chosen by GRUB at run-time; currently GRUB chooses 9600bps.
> 
> 9,600@tie{}bps.  :-)

Sure!

> Apart from that, as long as “make check-system TESTS=basic” and similar
> pass, that’s all good for me!

I tried the basic, btrfs-root-os, and encrypted-root-os tests. Testers
should note this is an ABI break.

> Mathieu: is it OK to apply this before the patch series on non-GRUB
> bootloaders?

I'll wait for this response.

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