Configuration CP308
Page 4 - 6 ID 1027-4487, Rev. 3.0
P R E L I M I N A R Y
4.3 CP308-Specific Registers
The following registers are special registers which the CP308 uses to watch the onboard
hardware special features and a number of CompactPCI control signals.
Normally, only the system uEFI BIOS uses these registers, but they are documented here for
application use as required.
4.3.1 Status Register 0 (STAT0)
The Status Register 0 holds general/common status information.
Note ...
Take care when modifying the contents of these registers as the system uEFI
BIOS may be relying on the state of the bits under its control.
Table 4-4: Status Register 0 (STAT0)
REGISTER NAME STATUS REGISTER 0 (STAT0)
ADDRESS 0x280
BIT NAME DESCRIPTION
RESET
VALUE
ACCESS
7 Res. Reserved 0 R
6 BBEI uEFI BIOS boot end indication:
0 = uEFI BIOS is booting
1 = uEFI BIOS boot is finished
0R
5 - 4 BFSS Boot Flash selection status:
00 = Primary boot Flash active
01 = Secondary boot Flash active
10 = External boot Flash active
11 = Reserved
00 R
3 DIP4 DIP switch SW1, switch 4 (PCB index 01: reset configuration/ PCB
index 00: reserved):
0 = Switch on
1 = Switch off
N/A R
2 DIP3 DIP switch SW1, switch 3 (Reserved):
0 = Switch on
1 = Switch off
N/A R
1 DIP1 DIP switch SW1, switch 2 (Clear the uEFI BIOS settings):
0 = Switch on
1 = Switch off
N/A R
0 DIP0 DIP switch SW1, switch 1 (Select SPI Flash):
0 = Switch on
1 = Switch off
N/A R
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