Author: stepan
Date: Sun Aug 15 13:37:41 2010
New Revision: 5697
URL: https://tracker.coreboot.org/trac/coreboot/changeset/5697
Log:
Gigabyte dual bios mainboard will always reboot, caused by the superio.
After lots of testing, the SuperIO LDN 7, register 0xEF is the key to the
problem. This patch adds a function which stops dual bios mainboards from
rebooting, when called.
Signed-off-by: Wang Qing Pei <wangqing...@gmail.com>
Acked-by: Stefan Reinauer <ste...@coresystems.de>
Modified:
trunk/src/superio/ite/it8718f/it8718f.h
trunk/src/superio/ite/it8718f/it8718f_early_serial.c
Modified: trunk/src/superio/ite/it8718f/it8718f.h
==============================================================================
--- trunk/src/superio/ite/it8718f/it8718f.h Sat Aug 14 22:38:17 2010
(r5696)
+++ trunk/src/superio/ite/it8718f/it8718f.h Sun Aug 15 13:37:41 2010
(r5697)
@@ -32,6 +32,7 @@
#if defined(__PRE_RAM__) && !defined(__ROMCC__)
void it8718f_24mhz_clkin(void);
+void it8718f_disable_reboot(void);
void it8718f_enable_serial(device_t dev, unsigned iobase);
#endif
Modified: trunk/src/superio/ite/it8718f/it8718f_early_serial.c
==============================================================================
--- trunk/src/superio/ite/it8718f/it8718f_early_serial.c Sat Aug 14
22:38:17 2010 (r5696)
+++ trunk/src/superio/ite/it8718f/it8718f_early_serial.c Sun Aug 15
13:37:41 2010 (r5697)
@@ -74,6 +74,20 @@
it8718f_exit_conf();
}
+/* GIGABYTE uses a special SuperIO register to protect its Dual BIOS
+ * mechanism. It lives in the GPIO LDN. However, register 0xEF is not
+ * mentioned in the IT8718F datasheet so just hardcode it to 0x7E for
+ * now.
+ */
+void it8718f_disable_reboot(void)
+{
+ it8718f_enter_conf();
+
+ it8718f_sio_write(0x07, 0xEF, 0x7E);
+
+ it8718f_exit_conf();
+}
+
/* Enable the peripheral devices on the IT8718F Super I/O chip. */
void it8718f_enable_serial(device_t dev, unsigned iobase)
{
--
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