[LinuxBIOS] serial port on GRUB

[Robert Millan]

Hi

With this commit serial port should work on GRUB now.  Please can someone test
on real hardware and confirm ?

(note: you need to initialise it with `serial' command, then switch to it with
`terminal serial')

2007-11-10  Robert Millan

* include/grub/i386/efi/machine.h: New file.
        * include/grub/i386/linuxbios/machine.h: Likewise.
        * include/grub/i386/pc/machine.h: Likewise.
        * include/grub/powerpc/ieee1275/machine.h: Likewise.
        * include/grub/sparc64/ieee1275/machine.h: Likewise.

* term/i386/pc/serial.c: Include <grub/machine/machine.h>.
        (serial_hw_io_addr): New variable.
        (serial_hw_get_port): Obtain port address from `serial_hw_io_addr'
        instead of `(unsigned short *) 0x400'.