[syslinux] [PATCH 0/1] dprintf: add debug console support

[Jonathan Boeing]

This patch adds support for printing messages through a debug console.  QEMU,
for example, supports this through the debugcon facility.  The benefit is that
it's *much* faster than printing over a serial port.

To print to I/O port 0x402 (the default used by SeaBIOS and OVMF),
add "-DDEBUG_IO_PORT=0x402 -DCORE_DEBUG=1" to the build CFLAGS.

To enable a debug console in QEMU that listens to I/O port 0x402 and prints to
stdio, add "-debugcon stdio -global isa-debugcon.iobase=0x402" to the QEMU
command line.

Jonathan Boeing (1):
  dprintf: add debug console support

 com32/include/dprintf.h      |  2 +-
 com32/lib/dprintf.c          |  4 ++--
 com32/lib/vdprintf.c         | 21 ++++++++++++++++++++-
 core/lwip/src/netif/undiif.c |  2 +-
 mk/devel.mk                  |  1 +
 5 files changed, 25 insertions(+), 5 deletions(-)

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2.3.0