Sun Microsystems Sun Fire V445 Server Administration Manual page 213

Note – Knowing how to construct an appropriate hardware device path requires
precise knowledge of the hardware architecture of the Sun Fire V445 system.
To customize an individual test, you can use test-args as follows:
TABLE 8-20
ok test /usb@1,3:test-args={verbose,debug}
This affects only the current test without changing the value of the test-args
OpenBoot configuration variable.
You can test all the devices in the device tree with the test-all command:
TABLE 8-21
ok test-all
If you specify a path argument to test-all, then only the specified device and its
children are tested. The following example shows the command to test the USB bus
and all devices with self-tests that are connected to the USB bus:
TABLE 8-22
ok test-all /pci@9,700000/usb@1,3
Chapter 8 Diagnostics 181