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hwad(1M) provides the exclusive mechanism by which SMS processes, including daemons, access, control, monitor, and configure the hardware.
hwad runs in either main or spare mode and asks the failover daemon (fomd(1M)) for the role that the system controller (SC) should play when it comes up.
At start-up, hwad opens all the drivers (sbbc, echip, gchip, and console
bus) and uses the ioctl calls to interface with them. It reads the contents of the device presence register to identify the boards present in the system, and makes them accessible to the clients.
IOSRAM and Mbox interfaces are also provided by hwad. This helps communication between the SC and the domain. For dynamic reconfiguration (DR), hwad directs communication to the new IOSRAM (tunnel switch). For darb interrupts, hwad notifies the dsmd(1M) if there is a dstop or rstop. It also notifies related SMS daemon(s), depending on the type of Mbox interrupt that occurs.
hwad detects and recovers console bus and jtag errors.
This daemon is started automatically by the ssd(1M) daemon. Do not start it manually from the command line.
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