At this point the boot is running in DDR3 RAM memory
This topic explains the boot sequence for the controller, which is based on the RAM and the Flash memory.
The flash memory contains two images:
| State | Display | Description |
|---|---|---|
| Hardware power on |
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Controller option card has power |
| Stage 0 |
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Reached after the I2C is initialized |
| Stage 1 |
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Reached after the DDR3 ram memory is initialized |
| Stage 2 |
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Reached just after the RAM memory relocation At this point the boot is running in DDR3 RAM memory |
| Stage 3 |
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Reached after the flash memory is initialized |
| Boot Startup Script |
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After all the previous steps, the startup script starts automatically. |
| QNX startup |
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Reached after the Boot startup script is finished |
| Sysinit |
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Reached after specific configuration parameters of the target are loaded, and after the network is started using the rotary switch. |
The controller may be booted with or without an EthernetEthernet is a large, diverse family of frame-based computer networking technologies that operate at many speeds for local area networks (LANs) cable attached.
When the controller is booted with a cable attached the configured IP address (depending upon the current position of the rotary switch) will be displayed in the 7-segment display (see Display the IP Address of a PDMM or PCMM). If the controller is started without a network connection then the IP address will not be displayed.
After the boot sequence is successful, the controller will be in one of two modes:
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Normal operation |
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Recovery Mode (if firmware download is permitted) |
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