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Monitor:
Basic Operation
Pm8560 User’s Manual
10006609-03
11-4
Prior to the console port being available, the monitor will display a four-bit hexadecimal
value on LED1 through LED4 to indicate the power-up status. In the event of a specific ini-
tialization error, the LED pattern will be displayed and the board initialization will halt. Refer
to
Fig. 11-2
for the LED pattern at the various initialization steps.
POST Diagnostic Results
The Pm8560 Power-on Self-test (POST) diagnostic results are stored as a 32-bit value in I
2
C
NVRAM at the offset 0x1DD8-0x1DDB. Each bit indicates the results of a specific test, there-
fore this field can store the results of up to 32 diagnostic tests.
Table 11-1
assigns the bits to
specific tests.
Table 11-1:
Post Diagnostic Results—Bit Assignments
Monitor SDRAM Usage
U-Boot locates its stack, uninitialized data, and code in the top one megabyte of SDRAM.
The exact address varies with the amount of installed memory. U-Boot uses the area from
0x00000000 to 0x00004000 in SDRAM for the MPC8560 exception vector table and U-Boot
internal use.
Caution:
Any writes to these areas can cause unpredictable operation of the monitor.
Updating the Monitor
A new feature of the Pm8560 is the ability to boot from a duplicate copy of the monitor
located in another flash bank. To take advantage of this feature, make sure both soldered
flash banks have the most current version of the monitor.
First, verify that a monitor ROM device is installed in the PLCC socket of the DMC module
and the DMC module is installed on the Pm8560. Then, place a shunt on JP2 across pins 3
and 4 on the DMC.
1
Issue the following command, where serial_number is the board’s serial number, at the
monitor prompt:
Bit:
Diagnostic Test:
Value:
0
SDRAM
0
Passed the test
1
Failure detected
1
reserved
2
I
2
C
3
reserved
4
reserved
5
No EREADY (if Monarch)
6 through 31
reserved
!
Summary of Contents for Pm8560
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Page 36: ...Setup Troubleshooting Pm8560 User s Manual 10006609 03 2 12 ...
Page 54: ...Serial I O Baud Rate Selection Pm8560 User s Manual 10006609 03 5 4 ...
Page 62: ...TDM Interface Rear Panel I O Connector P14 Pm8560 User s Manual 10006609 03 6 8 ...
Page 72: ...PCI Bus Interface PMC Connector Pin Assignments Pm8560 User s Manual 10006609 03 7 10 ...
Page 112: ...Development Mezzanine Card Troubleshooting Pm8560 User s Manual 10006609 03 10 12 ...
Page 138: ...Monitor Download Formats Pm8560 User s Manual 10006609 03 11 26 ...
Page 144: ...Index continued Pm8560 User s Manual 10006609 03 i 4 ...