Paul Menzel (paulepanter@users.sourceforge.net) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/3331
-gerrit
commit 2c5004e8095df19ccf39db2812faaf4a5daa0881 Author: Gerd Hoffmann kraxel@redhat.com Date: Wed May 29 13:06:22 2013 +0200
console: add support for QEMU's debugcon
Add support for sending debug output to an I/O port.
It can be used together with QEMU's isa-debugcon driver to log the coreboot output to a file. The port is configurable and defaults to 0x402 which has established as the de facto standard. For example, SeaBIOS+OVMF [1] use that one too.
[1] http://www.linux-kvm.org/page/OVMF Open Virtual Machine Firmware Change-Id: I0803f7fc70030242f80003e25c9449c37d71975e Signed-off-by: Gerd Hoffmann kraxel@redhat.com --- src/console/Kconfig | 17 ++++++++++++++ src/console/Makefile.inc | 1 + src/console/debugcon_console.c | 53 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 71 insertions(+)
diff --git a/src/console/Kconfig b/src/console/Kconfig index a613477..46fe2e7 100644 --- a/src/console/Kconfig +++ b/src/console/Kconfig @@ -250,6 +250,23 @@ config CONSOLE_CAR_BUFFER_SIZE in the DCACHE based RAM to keep console output before it can be saved in a CBMEM buffer. 3K bytes should be enough even for the BIOS_SPEW level. + +config CONSOLE_DEBUGCON + bool "QEMU debug console output" + depends on BOARD_EMULATION_QEMU_X86 + default y + help + Send coreboot debug output to QEMU's isa-debugcon device: + + qemu-system-x86_64 \ + -chardev file,id=debugcon,path=/dir/file.log \ + -device isa-debugcon,iobase=0x402,chardev=debugcon + +config CONSOLE_DEBUGCON_PORT + hex "QEMU debug console port" + depends on CONSOLE_DEBUGCON + default 0x402 + choice prompt "Default console log level" default DEFAULT_CONSOLE_LOGLEVEL_8 diff --git a/src/console/Makefile.inc b/src/console/Makefile.inc index 15034cb..a08c8a4 100644 --- a/src/console/Makefile.inc +++ b/src/console/Makefile.inc @@ -25,6 +25,7 @@ ramstage-$(CONFIG_USBDEBUG) += usbdebug_console.c ramstage-$(CONFIG_CONSOLE_LOGBUF) += logbuf_console.c ramstage-$(CONFIG_CONSOLE_NE2K) += ne2k_console.c ramstage-$(CONFIG_CONSOLE_CBMEM) += cbmem_console.c +ramstage-$(CONFIG_CONSOLE_DEBUGCON) += debugcon_console.c
$(obj)/console/console.ramstage.o : $(obj)/build.h diff --git a/src/console/debugcon_console.c b/src/console/debugcon_console.c new file mode 100644 index 0000000..a9bc7d3 --- /dev/null +++ b/src/console/debugcon_console.c @@ -0,0 +1,53 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Red Hat Inc. + * Written by Gerd Hoffmann kraxel@redhat.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <console/console.h> +#include <arch/io.h> + +static void debugcon_init(void) +{ +} + +static void debugcon_tx_byte(unsigned char data) +{ + outb(data, CONFIG_CONSOLE_DEBUGCON_PORT); +} + +static void debugcon_tx_flush(void) +{ +} + +static unsigned char debugcon_rx_byte(void) +{ + return 0; +} + +static int debugcon_tst_byte(void) +{ + return 0; +} + +static const struct console_driver debugcon_console __console = { + .init = debugcon_init, + .tx_byte = debugcon_tx_byte, + .tx_flush = debugcon_tx_flush, + .rx_byte = debugcon_rx_byte, + .tst_byte = debugcon_tst_byte, +};