AMD SB600 Specifications download pdf (Page 40)

2008 Advanced Micro Devices Inc.

Watchdog Timer

AMD SB600 BIOS Developer’s Guide (Public Version) Proprietary

Page 40

mov dx,0CD6h ; PMIO index register

mov al,6Ch ; Least significant base address location

out dx,al ; Set the index to 6Ch

mov dx,0CD7h ; PMIO data register

mov al,0F0h ; Least significant base address

out dx,al

To verify that the watchdog timer works correctly, perform the following steps:

• Write 100 (count) to the watchdog count register at address 0FEC000F4h.

• Enable and start the watchdog timer by writing 00000081h to the watchdog control register at

0FEC000F0h.

• The counter will start decrementing and will reset the system once it reaches 0. This means

that the watchdog timer is working as designed.

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AMD SB600 Specifications Page 40