/*CIM set this register; but I didn't find its description in RPR.
On DBM690T platform, I didn't find different between set and skip this register.
- But on Filbert platform, the CONFIG_DEBUG message from serial port on Peanut board can't be displayed
+ But on Filbert platform, the DEBUG message from serial port on Peanut board can't be displayed
after the bit0 of this register is set.
pci_write_config8(dev, 0x04, 0x21);
*/