firewire-phy-command(8) linux-firewire-utils"" firewire-phy-command(8)

firewire-phy-command - low-level FireWire bus and PHY configuration

firewire-phy-command [options] command [parameters]

firewire-phy-command is a utility to set low-level configuration parameters and to manage port power saving.

In the following commands, numbers must be specified in decimal, or in hexadecimal with a "0x" prefix.

node is either the device file (/dev/fw*) of the node that is to be accessed, or the node number.

The following commands are available:

The root parameter specifies the node that is forced to become the next root node.
The gapcount parameter specifies a timing parameter used to optimize performance. This must be derived from the actual worst-case round-trip delay between any two nodes.
At least one of root or gapcount must be specified.
The configuration changes take effect after the next bus reset, which must be issued immediately after this command; see the reset command below.
Send a ping packet to node node, and print node's answer (its self ID) together with the round-trip time.
Read a PHY register on node node and print the register value.
Registers 0 to 7 are global; registers 8 to 15 are paged and require both a page number and a port number.
Send a remote command packet to port port of node node, and print the new port status.
Do nothing, just return the status. This can be used to read the port status, or to check whether a port exists.
Disable the port and its connected peer port. This is the equivalent of breaking the connection between the port and the cable.
Re-enable a disabled port.
Suspend the connection between the port and its peer port, and recursively suspend all other active ports on the peer port's node.
Resume the port and all other ports in the suspended domain.
Clear the port's fault status bit(s). If a port entered the suspended state in a faulted condition because its peer port did not suspend correctly, clearing the fault is required after the resume to continue normal operation.
Broadcast a resume packet to all ports on the bus.
Send a link-on packet, which instructs node node to switch on, i.e., to come out of powersaving mode.
Issue a bus reset.

If there are multiple FireWire buses, i.e., if the computer has multiple FireWire controllers, this option specifies on which bus the command is sent. node must be the device file of the controller, or the controller's card number.
This option is not needed if a command's node parameter specifies a device node, as that parameter already implies the bus to use.
Print a summary of the command-line options and exit.
Print the version number of firewire-phy-command on the standard output and exit.

This program needs to access all FireWire device files, which usually requires root privileges.

Report bugs to <"linux1394-devel@sourceforge.net">.
"linux-firewire-utils" home page: <"https://git.kernel.org/pub/scm/utils/ieee1394/linux-firewire-utils.git/">.

lsfirewirephy(8), firewire-request(8)

5 Jun 2011