[SeaBIOS] [RFC PATCH 0/2] seabios: add serial console support

[Gerd Hoffmann]

  Hi,

Ok folks, finally took the time to put serial console support into
seabios natively, without requiring sgabios.  For now this will use the
first serial port in case no vgabios was found, i.e. use something along
the lines of "qemu -vga none -serial stdio" to check it out.

Design goal is to print as few control sequences as possible, so you
get readable logs when writing serial output to a file, but still allow
enough control that boot loader menus etc. can be used interactively.

The patches reached the first milestone now, you can boot into grub2
and use the builtin editor.  And unlike sgabios it will not go crazy in
case you try to move around the cursor quickly by holding down keys and
let autorepeat kick in.  ipxe command line editor worked too on a quick
test.

known issues / todo list:
 * isolinux/pxelinux seems to have trouble with this.
 * add support for sending output to both vga and serial.
 * add compile time config option.
 * add runtime config option.
 * figure reasonable plan for transition from sgabios.

enjoy,
  Gerd

Gerd Hoffmann (2):
  serial console, output
  serial console, input

 src/clock.c      |   1 +
 src/misc.c       |   2 +
 src/optionroms.c |   4 +-
 src/serial.c     | 595 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/util.h       |   3 +
 5 files changed, 604 insertions(+), 1 deletion(-)

-- 
1.8.3.1