TMS320C6746: Load binary to DSP L2 RAM

Jigs T

Part Number: TMS320C6746

We are using custom board which has TMS320C6746 DSP. I am trying to develop a small application to test few interfaces and I would like to load/flash the binary (.out) file to DSP L2 RAM memory (256KB) using JTAG by modifying the linker command file (.cmd) file. I have following two questions:

1. Is it safe to load/flash the binary (.out) file to DSP L2 RAM memory (256KB)? Is there any specific setting I need do to use the L2 RAM memory to load and run binary except for updating the .cmd file.

2. If it's safe to load then which of the following address should I mention in .cmd file:

a. 0x0080 0000 0x0083 FFFF - 256K DSP L2 RAM
b. 0x1180 0000 0x1183 FFFF - 256K DSP L2 RAM

Note: As per the SPRS590G document, the processor has a 256KB of L2 Unified Mapped RAM/Cache but it's listed twice in Memory Map table with different address range:
a. 0x0080 0000 0x0083 FFFF 256K DSP L2 RAM (Page 20 of SPRS590G document)
b. 0x1180 0000 0x1183 FFFF 256K DSP L2 RAM (Page 22 of SPRS590G document)

Thanks

Jigs

over 2 years ago

0 Rahul Prabhu over 2 years ago

TI__Guru** 116830 points

Yes, you can load code into DSP C674x L2 RAM as long as L2 RAM has been configured to not act as cache. Explicitly set the L2 RAM as 0 cache in the DSP configuration registers.

0x0080 0000 0x0083 FFFF is the local address of the DSP L2 RAM and 0x1180 0000 0x1183 FFFF is the global address. For DSP code, you can use the local addressng but for DMA or any other data moment, you will need to use global addresses if you are using it as shared memory or destination memory.

We have several software examples of that show this usage including DSP libraries etc. Let me know if you needs to find one that you want to use as reference.

Regards,

Rahul

PS: Refer:

(99+) TMS320C6748: How to use all L1D, L1P and L2 of C6748 as SRAM. - Processors forum - Processors - TI E2E support forums