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authorGerd Hoffmann <kraxel@redhat.com>2013-05-29 13:06:22 +0200
committerRonald G. Minnich <rminnich@gmail.com>2013-06-03 17:32:31 +0200
commit038aa29dc283205a993578f0ff3881df12ebdb0a (patch)
treedfa76228d6918abb11f84b162460025ce1130e52 /src
parent66da043e48c65e6d89b385d840e5f7c53e482db9 (diff)
downloadcoreboot-038aa29dc283205a993578f0ff3881df12ebdb0a.tar.xz
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> Reviewed-on: http://review.coreboot.org/3331 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src')
-rw-r--r--src/console/Kconfig17
-rw-r--r--src/console/Makefile.inc1
-rw-r--r--src/console/debugcon_console.c53
3 files changed, 71 insertions, 0 deletions
diff --git a/src/console/Kconfig b/src/console/Kconfig
index a613477ab3..46fe2e70a9 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 15034cbabd..a08c8a4414 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 0000000000..a9bc7d3cc6
--- /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,
+};