User`s guide

4–118 User Commands
User Commands
pwb
pwb
The pwb command writes a byte (8 bits) to an address in the PCI configuration
space.
Format
pwb pci_address id data bus function
Parameters
pci_address
Specifies which address to write to.
id
Specifies a decimal number that represents the slot assigned to the PCI device.
data
Specifies the value that is written to the pci_address.
bus
Specifies which bus to write to. The default value is 0.
function
Specifies which function to write from. The default value is 0.
Description
The pwb command writes a byte to the specified address in the PCI configuration
space for a device specified by the id. If the motherboard does not support PCI, then
this command is not implemented. If your system configuration supports multiple
PCI buses, use the parameters to specify the PCI device. Use the pcishow command
to view the available PCI devices.
Example
EB66> prb 4f 19
3F
EB66> pwb 4f 19 2f
EB66> prb 4f 19
2F