Hardware Reference Guide
SST-DN4-PCU
C.1.2 Check for Conflicting RAM
Before the channel’s shared memory can be safely enabled, you must determine that no other
system devices are using the intended memory address range.
Loading Firmware
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Note
Any task switching, interrupts or processes should be disabled during
this procedure.
To check for conflicting RAM, follow these steps:
1.
Write zero (0) to the Control Register to disable the channel.
2.
Read a word from the target memory window and save it.
3.
Write 0xAA55 to the target address.
4.
Read the target address. It should not contain 0xAA55.
5.
If 0xAA55 is read, a conflict exists. Perform the following steps:
•
Restore the saved value to the target address
•
Abort the load procedure
•
Examine the resource allocations in your operating system. If your operating system
does not manage resources, review the requirements of other hardware installed
in your machine to select a non-conflicting memory window. If you continue to
experience difficulties, please refer to Section 4.4,
General Troubleshooting
.
Note
If you are unsure of the system’s memory usage, you may want to do a
full memory window verification to ensure that there are no memory
conflicts.
