Preset Menu and diskless stuff

[Christoph Plattner]

As there is now the possibility to do the bootp call
with the option `--with-configfile', the whole diskless
environment setup can be done in the preset menu (for
exmaple a default preset menu for the "--enable-diskless"
option and an overridden preset menu with the 
"--enable-preset-menu=FILE" option.

This method has a big advantage for the use of serial 
consoles:
The setup for the serial console can be done
before the bootp request is done. In the current
GRUB version the GRUB seems to block, if the 
BOOTP server does not answer or if there is
a link problem.

So the preset file for the use of serial console should
be:

        serial --unit=0 --speed=19200
        terminal --timeout=0 serial

        bootp --with-configfile
        root (nd)     # only executed here, if no menu file found

The default preset file is

        bootp --with-configfile
        root (nd)     # only executed here, if no menu file found
        
Do you GRUB people also think it is a good idea ?

The changes:
-----------
*) Default preset file for diskless setup
*) Remove code setting up environment for diskless
*) macro DISKLESS_SUPPORT is not needed any more
*) nbgrub and pxegrub is built up with pre_stage2 instead of "diskless"

Comments on this are welcomed ....

Bye
        Christoph Plattner


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