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Chapter 2 39
Configuration management
Teststation-to-system communications
The hardware components located on the SCUB are shown in the
diagram on the left side of the node or system. They include three
ethernet ports and one DUART.
A layer of firmware between HP-UX and OBP called spp_pdc allows the
HP-UX kernel to communicate with OBP. spp_pdc is platform-
dependent code and runs on top of OBP providing access to the devices
and OBP configuration properties.
LAN communications
One system ethernet port connects to global LAN 0. The other ethernet
port connects to the system private LAN 1. The JTAG port is used for
scanning. The other port is used for downloading system firmware via
nfs using fwcp, via tftp using pdcfl, downloading disk firmware
using dfdutil (dfdutil uses tftp for read peripheral firmware), and
loading Symbios FORTH code using pcirom.
The configuration deamon, ccmd, which is located on the teststation
obtains system configuration information.
Serial communications
The DUART port on the SCUB provides an RS232 serial link (tty 0) to
the teststation. Through this port HP-UX, OBP, POST and the Test
Controller send console messages. The teststation processes these
message using sppconsole, ttylink, and consolelogx. POST and
OBP also send system status to the LCD connected to the DUART.