VisualDSP++ 4.5 Loader and Utilities Manual - Analog Devices

ADSP-2106x/21160 Processor Booting
Table 3-13. ADSP-2106x/21160 Processor Loader Block Tags
Tag Number Block Type Tag Number Block Type
0x0000 final init 0x000A zero pm48
0x0001 zero dm16 0x000B init pm16
0x0002 zero dm32 0x000C init pm32
0x0003 zero dm40 0x000E init pm48
0x0004 init dm16 0x000F zero dm64 (ADSP-21160 only)
0x0005 init dm32 0x0010 init dm64 (ADSP-21160 only)
0x0007 zero pm16 0x0011 zero pm64 (ADSP-21160 only)
0x0008 zero pm32 0x0012 init pm64 (ADSP-21160 only)
0x0009 zero pm40
The kernel enables the boot port (external or link) to read the block
header. After reading information from the block header, the kernel places
the body of the block in the appropriate place in memory if the block has
a block body, or initializes in the appropriate place with zero values in the
memory if the block is a zero block.
The final section, which is identified by a tag of 0x0, is called the final initialization
section. This section has self-modifying code that, when
executed, facilitates a DMA over the kernel, replacing it with user application
code that actually belongs in that space at run time. The final
initialization code also takes care of interrupts and returns the processor
registers, such as SYSCON and DMAC or LCTL, to their default values.
When the loader utility detects the final initialization tag, it reads the next
48-bit word. This word indicates the instruction to load into the 48-bit Px
register after the boot kernel finishes initializing memory.
The boot kernel requires that the interrupt, external port (or link port
address, depending on the boot mode) contains an RTI instruction. This
RTI is inserted automatically by the loader utility to guarantee that the
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