VisualDSP++ 4.5 Loader and Utilities Manual - Analog Devices

ADSP-21161 Processor Boot Streams
Loader for ADSP-21161 SHARC Processors
The loader utility produces the boot stream in blocks and inserts header
words at the beginning of data blocks in the loader (.ldr) file. The boot
kernel uses header words to properly place data and instruction blocks
into processor memory. The header format for PROM, host, and link
boot-loader files is as follows.
0x00000000DDDD
0xAAAAAAAALLLL
In the above example, D is a data block type tag, A is a block start address,
and L is a block word length.
For single-processor systems, the data block header has three 32-bit words
in SPI boot mode, as follows.
0xLLLLLLLL First word. Data word length or data word count of the data block.
0xAAAAAAAA Second word. Data block start address.
0x000000DD Third word. Tag of data block type.
The boot kernel examines the tag to determine the type of data or instruction
being loaded. Table 4-8 lists ADSP-21161N processor block tags.
Table 4-8. ADSP-21161N Processor Block Tags
Tag Number Block Type Tag Number Block Type
0x0000 final init 0x000E init pm48
0x0001 zero dm16 0x000F zero dm64
0x0002 zero dm32 0x0010 init dm64
0x0003 zero dm40 0x0012 init pm64
0x0004 init dm16 0x0013 init pm8 ext
0x0005 init dm32 0x0014 init pm16 ext
VisualDSP++ 4.5 Loader and Utilities Manual 4-17