Filter
Top Products
POST Boot Behavior 197
6-00020-02
SNC 5100
POST Error Codes
The Power-On-Self-Test (POST) is responsible for testing the integrity of the
processor’s SDRAM. After testing SDRAM POST will attempt to transfer
control to either the default bootrom image or an alternate image.
POST can also download binary images over the service port and write them to
flash memory. This enables POST to perform a minimal amount of emergency
recovery from FLASH errors.
POST Boot Behavior
ROM Init
Figure 10 ROM Init
After applying power the ERR LED will illuminate.
At this time postInit code initializes the processor’s internal registers and
subsystems, including the SDRAM controller.
The processor’s internal RAM is used as a tiny-stack for this stage of POST.
Control is then passed to the
IpostMain routine for the SDRAM memory.