Specifications

17 January 1997 – Subject to Change
SROM Initialization C–7
Special ROM Header
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 IDs and types include the
following:
Header rev ext The header revision for version 1 or greater headers is
determined by the sum of this field and the Header revision
field. See Header revision.
Flash ROM image size The flash ROM image size reflects the size of the image as it is
contained in the flash ROM. See Image size.
Optional firmware ID This optional field can be used to provide additional firmware
information such as firmware revision or a character-descriptive
string of up to eight characters.
ROM offset This field specifies the default ROM offset to be used when
programming the image into the ROM.
ROM offset valid The lower bit of ROM offset valid must be set when the ROM
offset field is specified. When no ROM offset is specified, the
ROM offset and ROM offset valid fields will contain zero.
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.
Table C–2 (Continued) Special Header Entry Descriptions
Entry Description
Firmware ID
Firmware
Type Description
DBM 0 Debug monitor
firmware
WNT 1 Windows NT ARC
firmware
SRM 2 Alpha SRM Console
firmware
FSB 6 Fail-safe booter
Milo 7 Linux miniloader