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4.2
Power-On Self-Test Diagnostics
Power-on self-test (POST) is a firmware program that helps determine whether a
portion of the system has failed. POST verifies the core functionality of the system,
including the CPU modules, motherboard, memory, and some on-board I/O devices.
The software then generates messages that can be useful in determining the nature
of a hardware failure. POST can run even if the system is unable to boot.
If POST detects a faulty component, it is disabled automatically, preventing faulty
hardware from potentially harming any software. If the system is capable of running
without the disabled component, the system boots when POST is complete. For
example, if one of the processor cores is deemed faulty by POST, the core is disabled,
and the system boots and runs using the remaining cores.
POST diagnostic and error message reports are displayed on a console.
4.2.1
POST Test Coverage
The POST diagnostics include the following tests:
1. UltraSPARC T1 Processor Tests:
2. Memory Tests (up to 2-Gbyte/DIMM):
3. POST Image Tests
4. ECC Error Test
4-2
Netra CP3060 Board User's Guide • April 2009
• MMU (Memory Management Unit), all cores
• DMMU TLBs: tags, data RAM tests
• IMMU TLBs: tags, data RAM tests
• Caches, all cores
• L2 Cache
• L1 Icache
• L1 Dcache
• FPU (Floating Point Unit
• Functional
• Register
• Interrupts
• SDRAM data line test
• SDRAM address line test
• SDARM cell integrity Test
• MOVing inversions memory test
• POST PROM checksum test
• POST memory checksum test
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