Ronald G. Minnich (rminnich@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2086
-gerrit
commit 1f6b08ad5bafa426c813bd09ec6c268c3c23160a Author: David Hendricks dhendrix@chromium.org Date: Mon Dec 31 17:28:43 2012 -0800
make early serial console support more generic
This patch makes pre-RAM serial init more generic, particularly for platforms which do not necessarily need cache-as-RAM in order to use the serial console and do not have a standard 8250 serial port.
This adds a Kconfig variable to set romstage-* for very early serial console init. The current method assumes that cache-as-RAM should enable this, so to maintain compatibility selecting CACHE_AS_RAM will also select EARLY_SERIAL_CONSOLE.
The UART code structure needs some rework, but the use of ROMCC, romstage, and then ramstage makes things complex.
Change-Id: I089e7af633c227baf3c06c685f005e9d0e4b38ce Signed-off-by: David Hendricks dhendrix@chromium.org Signed-off-by: Ronald G. Minnich rminnich@gmail.com --- src/console/Kconfig | 7 +++++++ src/console/Makefile.inc | 2 +- src/console/console.c | 4 +++- src/cpu/Kconfig | 1 + src/include/uart.h | 13 +++++++------ src/include/uart8250.h | 1 - 6 files changed, 19 insertions(+), 9 deletions(-)
diff --git a/src/console/Kconfig b/src/console/Kconfig index 117fdb8..a726c1f 100644 --- a/src/console/Kconfig +++ b/src/console/Kconfig @@ -5,6 +5,13 @@ config SERIAL_CONSOLE help Send coreboot debug output to a serial port
+config EARLY_SERIAL_CONSOLE + bool + select SERIAL_CONSOLE + default n + help + Use serial console during early boot stages (e.g. cache-as-RAM) + config CONSOLE_SERIAL8250 bool "Serial port console output (I/O mapped, 8250-compatible)" depends on SERIAL_CONSOLE diff --git a/src/console/Makefile.inc b/src/console/Makefile.inc index a712486..3c4777f 100644 --- a/src/console/Makefile.inc +++ b/src/console/Makefile.inc @@ -10,7 +10,7 @@ smm-y += vtxprintf.c smm-$(CONFIG_SMM_TSEG) += die.c
romstage-y += vtxprintf.c -romstage-$(CONFIG_CACHE_AS_RAM) += console.c +romstage-$(CONFIG_EARLY_SERIAL_CONSOLE) += console.c romstage-y += post.c romstage-y += die.c
diff --git a/src/console/console.c b/src/console/console.c index d5f25a5..e92dbf6 100644 --- a/src/console/console.c +++ b/src/console/console.c @@ -99,13 +99,15 @@ int console_tst_byte(void)
#else // __PRE_RAM__ ^^^ NOT defined vvv defined
+#include <uart.h> + void console_init(void) { #if CONFIG_USBDEBUG enable_usbdebug(CONFIG_USBDEBUG_DEFAULT_PORT); early_usbdebug_init(); #endif -#if CONFIG_CONSOLE_SERIAL8250 +#if CONFIG_SERIAL_CONSOLE && !CONFIG_CONSOLE_SERIAL8250MEM uart_init(); #endif #if CONFIG_DRIVERS_OXFORD_OXPCIE && CONFIG_CONSOLE_SERIAL8250MEM diff --git a/src/cpu/Kconfig b/src/cpu/Kconfig index 383ba79..ddc46cf 100644 --- a/src/cpu/Kconfig +++ b/src/cpu/Kconfig @@ -16,6 +16,7 @@ source src/cpu/x86/Kconfig
config CACHE_AS_RAM bool + select EARLY_SERIAL_CONSOLE default !ROMCC
config DCACHE_RAM_BASE diff --git a/src/include/uart.h b/src/include/uart.h index 931d6dc..c592cfc 100644 --- a/src/include/uart.h +++ b/src/include/uart.h @@ -15,19 +15,20 @@ * 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 - * - * FIXME(dhendrix): This file contains generic prototypes for UART functions. - * The existing headers are too specific to the 8250, so we need a better - * abstraction for use with non-8250 UARTs. */
+/* madness. Uarts are a mess. If you include this file, it + * includes ALL uart implementations which may be needed. + * No need to include them separately, and include this file FIRST. + * At least one (but at most one) of the files needs to define + * uart_init(). + */ #ifndef UART_H #define UART_H
+#include <uart8250.h> unsigned char uart_rx_byte(void); void uart_tx_byte(unsigned char data); void uart_tx_flush(void);
-void uart_init(void); - #endif /* UART_H */ diff --git a/src/include/uart8250.h b/src/include/uart8250.h index b00ff48..9af43f2 100644 --- a/src/include/uart8250.h +++ b/src/include/uart8250.h @@ -120,7 +120,6 @@ unsigned char uart8250_rx_byte(unsigned base_port); int uart8250_can_rx_byte(unsigned base_port); void uart8250_tx_byte(unsigned base_port, unsigned char data); void uart8250_tx_flush(unsigned base_port); - /* Yes it is silly to have three different uart init functions. But we used to * have three different sets of uart code, so it's an improvement. */