This section describes how the teststation communicates with
the system. Figure 10-1 “teststation-to-system communications” shows the
paths and processes for the V-Class server using HP-UX.
The hardware components located on the ECUB are shown in the
diagram on the left side of the 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 0 communications |
 |
One system ethernet port connects to global LAN 0. Across
this LAN system events are reported to the teststation using the
HP-UX daemon. This daemon polls two databases, memlog and syslog,
for errors and reports these errors on the teststation. HP-UX loads
memory errors into the memlog database and recoverable cache errors
into the syslog database.
LAN 1 communications |
|
The two other ECUB ethernet ports connect to the system LAN
1. The JTAG port is used for scanning. The other port is used for
downloading system firmware via nfs,
downloading disk firmware, and loading firmware into the I/O
subsystem. A configuration utility that is located on the teststation
obtains system configuration information.
Serial communications |
|
The DUART port on the ECUB provides an RS232 serial link to
the teststation. Through this port HP-UX, OBP, firmware in EEPROM
known as Power-On Self Test (POST—see the section “Power-On Self Test routine”) send console
messages. POST and OBP also send system status to the LCD connected
the DUART.
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