D
ELTA
T
AU
P
OWER
PMAC
R
EFERENCE
JUNE-2018
P
OWER
PMAC
UMAC
ARM
CPU
B
OARD
H
ARDWARE
R
EFERENCE
13
examine the Windows device manager to know what COM port Windows has chosen. The serial
mode is useful for diagnostics for use with a Windows serial console program such as putty.exe.
The PowerPMAC must be externally powered for data to be present from this port. Below is an
example of the startup diagnostic data that the CPU prints over the serial port on startup.
USB Flash Memory Functionality
To place Processor in USB Flash memory mode do the following
1.)
Make sure power is
NOT
applied to the UMAC ARM CPU Board and plug a
micro
USB
cable from the PC to the side of the UMAC ARM CPU. There will be a green LED
indicating the UMAC ARM CPU is receiving power from the PC USB connector to
power its built in USB Serial port.
2.)
Using a small screw driver click the switch S2 (see figure 2) internal to the UMAC ARM
CPU Board to change the USB Diag mode connection from USB Serial to USB mass
storage. The LED will switch from GREEN to ORANGE once you have successfully
switched the UMAC ARM CPU Board USB diagnostic mode to mass storage. In
addition simultaneously Windows will automatically open an explorer session for the
Power PMAC CPU mass storage disk.
