AM4011
Configuration
ID 1022-1626, Rev. 1.0
Page 4 - 7
P R E L I M I N A R Y
4.4.1
BIOS Configuration Register
The BIOS Configuration Register is used to configure a number of BIOS settings. The register
is read only and can be configured only by the Module Management Controller.
4.4.2
MMC I/O Status Register
The MMC I/O Status Register describes the MMC control signals. The register is read only and
can be configured only by the Module Management Controller.
Table 4-8:
BIOS Configuration Register
REGISTER NAME
BIOS CONFIGURATION REGISTER
ADDRESS
0x280
BIT
NAME
DESCRIPTION
RESET
VALUE
ACCESS
7
WPFWH
FWH write protection
0 = FWH write protection is disabled
1 = FWH write protection is enabled
0
6-5
Res.
Reserved
00
R
4-3
BCON
BIOS configuration
00
R
2-0
BBOCON BIOS boot order configuration
000 = Default BIOS boot order configuration
If the DIP switch 3 is on, the default BIOS boot order configuration is
selected
0
R
Table 4-9:
MMC I/O Status Register
REGISTER NAME
MMC I/O STATUS REGISTER
ADDRESS
0x281
BIT
NAME
DESCRIPTION
RESET
VALUE
ACCESS
7
MFSEL
MMC Firmware Hub selection
0 = Select second FWH boot device
1 = Default FWH boot device is active
1
R
6
MCOVT
MMC chipset overtemperature
0 = Chipset temperature is above 105 °C
1 = Normal operating
1
R
5
MEOR
MMC AMC Extended Options Region configuration
0 = AMC Extended Options Region is disabled
1 = AMC Extended Options Region is enabled
With this bit the COM2 port and the debug port of the AMC Extended
Options Region can be configured.
1
R
4-1
Res.
Reserved
1111
R
0
PEXC
PCI Express reference clock (100 MHz) configuration
0 = Reference clock from AMC Card-edge connector (FCLKA)
1 = Local reference clock used
1
R
