Serial support and DUMB serial support

[Christoph Plattner]

Hello GRUB community !

In our company we use GRUB to boot a couple of embedded machines
in complex setups. Further we use automatic test scenarios, where
test tools control the machine via serial console or ethernet.

For the serial console I have some ideas for improvements.
2 Points:

1) As GRUB now shifts the command line, it it exceeds the line
length, the `serial_getxy' should not do a real terminal query
any more. In setups not using a xterm but editor `emacs' or
using `expect' cannot handle this easily. As we always stay
in the same line, `x' can be calculated. For `y' I have to 
check, if it is needed for the command line editing.

2) DUMB terminal support for serial line:
The menu should work a little bit different. My prefered
solution is, that every menu selection has to be confirmed
by return. On the first keypress the countdown is stopped
(as now implemeted), then there is not a up down, but a
selection per number, like `3<ENTER>'. A `<ENTER>' alone
can select the default entry. To get in command line mode
a `c<ENTER>' must be given. To edit the default entry
use `e<ENTER>', to edit entry 3 (for example), use 
`e3<ENTER>'. So also canonical terminals can be used to
control GRUB inclusive the menu.

With this change, it would be easy to use the GRUB menu
out of `emacs' or `expect'. 

Chnages for point 1 are quite simple (my opinion).
For point 2 the control logic must be addepted to
the usage of <ENTER> without breaking the default
menu behavior.

What do you think of this change ?

With friendly regards
Christoph P.


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