Power-On Self-Test (Post) - Emerson RXi2-EP Hardware Reference Manual

Hardware Reference Manual
GFK-3014F
4.4

Power-On Self-Test (POST)

Each time the computer boots up it must pass the POST. If the computer
does not pass any of the test items, the unit will fail the POST.
Test items are as follows:
CPU must exit the reset status mode and thereafter be able to
•
execute instructions
SPI Flash ROM and Non-Volatile Random Access Memory (NOVRAM) is
•
readable
Checksum is valid (readable)
•
CMOS is readable (CMOS checksum is valid)
•
CPU is able to read all forms of memory, such as the memory
•
controller, memory bus, and memory module
First 64 KB of memory is operational and has the capability to
•
Read/Write, and contains the POST code
I/O bus / controller is accessible
•
I/O bus is able to Read/Write from the video subsystem and be able
•
to read all video RAM
Hardware Interface
Section 4
Feb 2023
17