VisualDSP++ 4.5 Loader and Utilities Manual - Analog Devices

Loader for ADSP-2106x/21160 SHARC Processors
Once the boot kernel has been loaded successfully into the processor, the
kernel follows the following sequence:
1. Each boot kernel begins with general initializations for the DAG registers,
appropriate interrupts, processor ID information, and
various SDRAM or WAIT state initializations.
2. Once the boot kernel has finished the task of initializing the processor,
the kernel initializes processor memory, both internal and
external, with user application code.
ADSP-2106x/21160 Processor Boot Steams
The structure of a loader file enables the boot kernel to load code and
data, block by block. In the loader file, each block of code or data is preceded
by a block header, which describes the block —length, placement,
and data or instruction type. After the block header, the loader utility outputs
the block body, which includes the actual data or instructions for
placement in the processor memory. The loader utility, however, does not
output a block body if the actual data or instructions are all zeros in value.
This type of block called a zero block. Table 3-12 describes the block
header and block body formats.
Table 3-12. Boot Block Format
Block header
Block body
(if not a zero block)
First word Bits 16–47 are not used.
Bits 0–15 define the type of data block (tag).
Second word Bits 16–47 are the start address of the block.
Bits 0–15 are the word count for the block.
Word 1 (48 bits)
Word 2 (48 bits)
The loader utility identifies the data type in the block header with a 16-bit
tag that precedes the block. Each type of initialization has a unique tag
number. The tag numbers and block types are shown in Table 3-13.
VisualDSP++ 4.5 Loader and Utilities Manual 3-17