Can I place DATA in CODE memory and vice-versa?

Q

A

The ADSP-CM408F (an example package used for explanation) has 384KB of internal
SRAM memory that may be used as CODE or DATA. This is allowed in 64KB chunks of
SRAM that can be configured as either DATA or CODE at a time. However, this
organization is only to facilitate performance, so that SYS Bus (DATA) and I/D
Code buses (CODE) conflicts are avoided. Cortex M4 memory standard allows one
to place CODE in DATA region and vice versa. This is supported in CM40x as
well. This may come handy if user has to deal with small chunks of DATA that
cannot be justified to occupy entire 64KB, which may better used to configure
for CODE although with some memory allocated for DATA. This approach may be
used for CODE placement in DATA as well.

Comments

kai-germany over 2 years ago in reply to kai-germany

Blackfin L1 data memory can't be used for instructions and L1 instruction memory can't be used for data:

https://ez.analog.com/thread/85737
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kai-germany over 2 years ago
Hello,

I have the same question and can't find an answer or get it work. I'm using an Analog Devices Blackfin ADBF533 DSP with VisualDSP++. I don't use SRAM. Everything is placed at L1_code, but the size is not enough. I would like to move the biggest parts to L1_data_b:

I tried this (and other steps as well):

https://ez.analog.com/thread/14738#comment-57753

but without any results. I can write:

#pragma section("BugsBunny")

but without recognition or errors.

What could I do and what works? Or is it impossible at that processor?

Thank you very much in advance for your answer!
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