User`s manual

4.4 Flash ROM (System ROM)
If jumper J3-25/26 is installed, the Alpha PCI 64–275 reads the value at
location 3F of the TOY NVRAM. The Alpha PCI 64–275 uses the value found
there to determine which image will be selected (see Table 4–3). The selected
image is loaded and executed.
Table 4–3 Higher 512KB Flash ROM Image Selection
TOY RAM Value
1
Firmware ID
2
Image Description
00 0 Evaluation board debug monitor firmware
01 1 Windows NT ARC firmware
02 2 Alpha SRM firmware (OpenVMS)
3
03 2 Alpha SRM firmware (Digital UNIX)
3
8n Not applicable SROM code will load the nth image from
flash ROM.
If n=0, the SROM code loads the entire
flash ROM contents.
If n=1, 2, ..., the SROM code loads the first
image, second image, and so on.
1
Operating system type. Found at TOY RAM address 3F.
2
Found in image header.
3
Support for this operating sytem requires the purchase of the proper software license.
If an image is specified and is not found, the Alpha PCI 64–275 loads the first
image in the flash ROM with a valid header. If no valid header is found, the
entire 1MB flash image is loaded at address 0000 0000.
The following sequence of steps describes how to change the value stored in
TOY RAM location 3F by using either the basic debug monitor commands or
the debug monitor bootopt command.
Changing TOY RAM Location 3F—Debug Monitor bootopt Command
Use the debug monitor bootopt command to change the value in location 3F.
In the example shown here, the bootopt command is used to change the value
in location 3F from 0 to 1:
1
1
The Alpha PCI 64–275 uses the same firmware as the AlphaPC64, so the firmware
prompts may appear as
AlphaPC64> .
4–10 Functional Elements