User`s guide

Table B–6 (Cont.) Special Header Entry Descriptions
Entry Description
Firmware ID The firmware ID is a byte that specifies the firmware type.
This information facilitates image boot options necessary to
boot different operating systems.
Firmware Name
Firmware
Type Firmware Description
Debug monitor 0 Alpha evaluation board
debug monitor
Windows NT 1 Windows NT firmware
Alpha SRM 2 Alpha System Reference
Manual console
Optional firmware ID This optional field can be used to provide additional
firmware information such as firmware revision or a
character descriptive string up to 8 characters.
Header checksum The checksum of the header. This is used to validate the
presence of a header beyond the validation provided by the
validation pattern.
B.1.7.2 Flash ROM Structure
During the power-up and initialization sequence, the AlphaPC64 will always
load the first image if the jumper is not installed (BOOT_OPTION is 1).
If the jumper is installed, the AlphaPC64 will read the value at location 3F in
the TOY RAM. The AlphaPC64 uses that value found at TOY RAM location 3F
to determine which image is selected (see Table B–7). The selected image will
be loaded and executed.
B–12 SROM Initialization