Gigabyte dual bios mainboard will always reboot, caused by the superio.

[coreboot.git] / src / superio / ite / it8718f / it8718f_early_serial.c

diff --git a/src/superio/ite/it8718f/it8718f_early_serial.c b/src/superio/ite/it8718f/it8718f_early_serial.c
index fabbde5e8fc5f9d2eaf56af7d364328bf858ecdd..c3a8c732642c89ac2c005eef520971621598012d 100644 (file)
--- a/src/superio/ite/it8718f/it8718f_early_serial.c
+++ b/src/superio/ite/it8718f/it8718f_early_serial.c
@@ -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)
 {