Motorola MVME2600 Series User Manual download pdf (Page 23)

100

101

General Information

1-5

The system performs the self test diagnostics if you do not

terminate system start-up. Upon successful completion of these

tests, the system pauses another five seconds. You may terminate

start-up, and exit to the diagnostics prompt, by pressing ESC or the

Break key.

If you do not terminate system start-up, the system begins the boot

routine that has been set up in the ENV command, either NVRAM

Boot List Boot, Auto Boot, ROMboot, or Network Auto Boot.

If the self-tests fail, various error messages appear, and the

diagnostics prompt appears.

Refer to Chapter 3 for information on setting the ENV command

parameters.

MPU, Hardware, and Firmware Initialization

The MPU, hardware, and firmware initialization process is

performed by the PPCBug power-up or system reset. The steps

below are a high-level outline; not all of the detailed steps are listed.

1. Set MPU.MSR to known value.

2. Invalidate the MPU's data/instruction caches.

3. Clear all segment registers of the MPU.

4. Clear all block address translation registers of the MPU.

5. For Òdual CPU onlyÓ boards (MVME460x or MTX), catch one

CPU of a dual CPU and place it in a waiting loop.

6. Initialize the MPU bus to PCI bus bridge device.

7. Initialize the PCI bus to ISA bus bridge device.

8. Calculate the external bus clock speed of the MPU.

9. Delay for 750 milliseconds.

10. Determine the CPU board type.

11. Size the local read/write memory (i.e., DRAM).

12. Initialize the read/write memory controller.

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Motorola MVME2600 Series User Manual Page 23

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