User`s guide

4–162 User Commands
User Commands
wbctl
wbctl
The wbctl command writes to the backup cache control register.
Format
wbctl bctl_data [bcfg_data]
Parameters
bctl_data
Specifies the new backup cache control register value. If not supplied, the current
value remains unchanged.
bcfg_data
Specifies the new backup cache configuration register value.
Description
The wbctl command writes to the backup cache control register and the backup
cache configuration register in the same command. If you are making a change to the
control register that requires a change to the configuration register, specify both
values in a single write to prevent the CPU from being in an inconsistent state. If the
change you are making to the backup cache control register does not require a
change to the configuration register, the second parameter is optional. The memory
controller registers are automatically changed to reflect the new state of the backup
cache.
This command is implemented only for the Alpha 21164 microprocessor family.
Example
EB164> wbctl 8051
Old BC_CTL = 0x00028051 & BC_CFG = 0x01E21772
New BC_CTL = 0x00008051 & BC_CFG = 0x01E21772
CIA_CACK_EN = 0x8 & CIA_MCR = 0x0001FE21