firewire-phy-command(8) | linux-firewire-utils"" | firewire-phy-command(8) |
NAME¶
firewire-phy-command - low-level FireWire bus and PHY configuration
SYNOPSIS¶
firewire-phy-command [options] command [parameters]
DESCRIPTION¶
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:
- firewire-phy-command config [root node] [gapcount gapcount]
- 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.
- firewire-phy-command ping node
- Send a ping packet to node node, and print node's answer (its self ID) together with the round-trip time.
- firewire-phy-command read node [page port] register
- 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.
- firewire-phy-command nop node port
- firewire-phy-command disable node port
- firewire-phy-command enable node port
- firewire-phy-command suspend node port
- firewire-phy-command resume node port
- firewire-phy-command clear node port
- Send a remote command packet to port port of node node, and print the new port status.
- nop
- Do nothing, just return the status. This can be used to read the port status, or to check whether a port exists.
- disable
- Disable the port and its connected peer port. This is the equivalent of breaking the connection between the port and the cable.
- enable
- Re-enable a disabled port.
- suspend
- Suspend the connection between the port and its peer port, and recursively suspend all other active ports on the peer port's node.
- resume
- Resume the port and all other ports in the suspended domain.
- clear
- 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.
- firewire-phy-command resume
- Broadcast a resume packet to all ports on the bus.
- firewire-phy-command linkon node
- Send a link-on packet, which instructs node node to switch on, i.e., to come out of powersaving mode.
- firewire-phy-command reset
- Issue a bus reset.
OPTIONS¶
- -b, --bus=node
- 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.
- -h, --help
- Print a summary of the command-line options and exit.
- -V, --version
- Print the version number of firewire-phy-command on the standard output and exit.
NOTES¶
This program needs to access all FireWire device files, which usually requires root privileges.
BUGS¶
Report bugs to
<"linux1394-devel@sourceforge.net">.
"linux-firewire-utils" home page:
<"https://git.kernel.org/pub/scm/utils/ieee1394/linux-firewire-utils.git/">.
SEE ALSO¶
5 Jun 2011 |