VisualDSP++ 4.5 Loader and Utilities Manual - Analog Devices

ADSP-2126x/2136x/2137x Processor Booting
Boot Kernel Modification and Loader Issues
Boot kernel customization is required for some systems. In addition, the
operation of other tools (such as the C/C++ compiler) is influenced by
whether the loader utility is used.
If you do not specify a boot kernel file via the Load page of the Project
Options dialog box in VisualDSP++ (or via the -l command-line switch),
the loader utility places a default boot kernel (see Table 5-11) in the
loader output file based on the specified boot type.
If you do not want to use any boot kernel file, check the No kernel box (or
specify the -nokernel command-line switch). The loader utility places no
boot kernel in the loader output file.
Rebuilding a Boot Kernel File
If you modify the boot kernel source (.asm) file by inserting correct values
for your system, you must rebuild the boot kernel (.dxe) before generating
the boot-loadable (.ldr) file. The boot kernel source file contains default
values for the SYSCON register. The WAIT, SDCTL, and SDRDIV initialization
code are in the boot kernel file comments.
To Modify a Boot Kernel Source File
1. Copy the applicable boot kernel source file (26x_prom.asm,
26x_spi.asm, 36x_prom.asm, 36x_spi.asm, 369_prom.asm,
369_spi.asm).
2. Apply the appropriate changes.
After modifying the boot kernel source file, rebuild the boot kernel (.dxe)
file. Do this from within the VisualDSP++ IDDE (refer to VisualDSP++
online Help for details) or rebuild a boot kernel file from the command
line.
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