22 Sep
2008
22 Sep
'08
10 p.m.
This patch allows the dbm690t SIO to work. The changes affect the Asus a8n_e. Can someone with a a8n_e test this?
Thanks, Marc
--
Marc Jones
Senior Firmware Engineer
(970) 226-9684 Office
mailto:Marc.Jones@amd.com
http://www.amd.com/embeddedprocessors
The AMD dbm690t mainboard uses the it8712f SIO with the
default 48MHz clock input. The Asus a8n_e uses the it8712f
with a 24MHz clock input. The it8712f early init code was
setting a 24MHz input clock. Since 48Mhz is the default I added
a function to set 24MHz input clock to the a8n_e.
Signed-off-by: Marc Jones marc.jones@amd.com
Index: coreboot-v2/src/superio/ite/it8712f/it8712f_early_serial.c
===================================================================
--- coreboot-v2.orig/src/superio/ite/it8712f/it8712f_early_serial.c 2008-09-22 08:46:12.000000000 -0600
+++ coreboot-v2/src/superio/ite/it8712f/it8712f_early_serial.c 2008-09-22 14:17:44.000000000 -0600
@@ -45,10 +45,10 @@
outb(value, SIO_DATA);
}
-/* Enable the peripheral devices on the IT8712F Super I/O chip. */
-static void it8712f_enable_serial(device_t dev, unsigned iobase)
+
+static void it8712f_enter_conf(void)
{
- /* (1) Enter the configuration state (MB PnP mode). */
+ /* Enter the configuration state (MB PnP mode). */
/* Perform MB PnP setup to put the SIO chip at 0x2e. */
/* Base address 0x2e: 0x87 0x01 0x55 0x55. */
@@ -57,6 +57,32 @@
outb(0x01, IT8712F_CONFIGURATION_PORT);
outb(0x55, IT8712F_CONFIGURATION_PORT);
outb(0x55, IT8712F_CONFIGURATION_PORT);
+}
+
+static void it8712f_exit_conf(void)
+{
+ /* Exit the configuration state (MB PnP mode). */
+ it8712f_sio_write(0x00, IT8712F_CONFIG_REG_CC, 0x02);
+}
+
+
+static void it8712f_24mhz_clkin(void)
+{
+ it8712f_enter_conf();
+
+ /* Select 24MHz CLKIN (48MHZ default)*/
+ it8712f_sio_write(0x00, IT8712F_CONFIG_REG_CLOCKSEL, 0x1);
+
+ it8712f_exit_conf();
+
+}
+
+/* Enable the peripheral devices on the IT8712F Super I/O chip. */
+static void it8712f_enable_serial(device_t dev, unsigned iobase)
+{
+
+ /* (1) Enter the configuration state (MB PnP mode). */
+ it8712f_enter_conf();
/* (2) Modify the data of configuration registers. */
@@ -69,13 +95,9 @@
it8712f_sio_write(IT8712F_SP1, 0x30, 0x1); /* Serial port 1 */
it8712f_sio_write(IT8712F_SP2, 0x30, 0x1); /* Serial port 2 */
- /* Select 24MHz CLKIN (set bit 0). */
- it8712f_sio_write(0x00, IT8712F_CONFIG_REG_CLOCKSEL, 0x01);
-
/* Clear software suspend mode (clear bit 0). TODO: Needed? */
/* it8712f_sio_write(0x00, IT8712F_CONFIG_REG_SWSUSP, 0x00); */
/* (3) Exit the configuration state (MB PnP mode). */
- it8712f_sio_write(0x00, IT8712F_CONFIG_REG_CC, 0x02);
+ it8712f_exit_conf();
}
-
Index: coreboot-v2/src/mainboard/asus/a8n_e/cache_as_ram_auto.c
===================================================================
--- coreboot-v2.orig/src/mainboard/asus/a8n_e/cache_as_ram_auto.c 2008-09-22 09:28:13.000000000 -0600
+++ coreboot-v2/src/mainboard/asus/a8n_e/cache_as_ram_auto.c 2008-09-22 14:14:57.000000000 -0600
@@ -221,6 +221,7 @@
bsp_apicid = init_cpus(cpu_init_detectedx);
}
+ it8712f_24mhz_clkin();
it8712f_enable_serial(SERIAL_DEV, TTYS0_BASE);
uart_init();
console_init();