VisualDSP++ 4.5 Loader and Utilities Manual - Analog Devices

Loader/Splitter for Blackfin Processors
ADSP-BF531/BF532/BF533/BF534/BF536/BF537/BF538/
BF539 Processor Boot Streams
The following sections describe the boot stream, header, and flag framework
for the ADSP-BF531, ADSP-BF532, ADSP-BF533, ADSP-BF534,
ADSP-BF536, ADSP-BF537, ADSP-BF538, and ADSP-BF539
processors.
“ADSP-BF531/BF532/BF533/BF534/BF536/BF537/BF538/
BF539 Blocks, Block Headers, and Flags” on page 2-33
“Initialization Blocks” on page 2-36
The ADSP-BF531/BF532/BF533/BF534/BF536/BF537/BF538/BF539
processor boot stream is similar to the boot stream that uses a second-stage
kernel of ADSP-BF535 processors (detailed in “Loader Files With a Second-Stage
Loader” on page 2-10). However, since the former processors
do not employ a second-stage loader, their boot streams do not include
the second-stage loader code and the associated 4-byte header on the top
of the kernel code. There is also no 4-byte global header.
ADSP-BF531/BF532/BF533/BF534/BF536/BF537/BF538/
BF539 Blocks, Block Headers, and Flags
As the loader utility converts the code from an input .dxe file into blocks
comprising the output loader file, each block receives a 10-byte header
(Figure 2-28), followed by a block body (if it is a non-zero block) or
no-block body (if it is a zero block). A description of the header structure
can be found in Table 2-4.
Table 2-4. ADSP-BF531/BF532/BF533 Block Header Structure
Bit Field Description
Address 4-byte address at which the block resides in memory.
Count 4-byte number of bytes to boot.
VisualDSP++ 4.5 Loader and Utilities Manual 2-33