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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 <wangqingpei@gmail.com>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5697 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Wang Qing Pei 2010-08-15 11:37:41 +00:00 committed by Stefan Reinauer
parent 3058491257
commit 6d7c1fc3a4
2 changed files with 15 additions and 0 deletions
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1
src/superio/ite/it8718f/it8718f.h
View File

@ -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

14
src/superio/ite/it8718f/it8718f_early_serial.c
View File

@ -74,6 +74,20 @@ void it8718f_24mhz_clkin(void)
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)
{