The problem with dynamic memory usage in MSC8156 processor.

[exciton]

Hello!

I use board MSC8156ADS and environment CodeWarrior. I’ve decided to check the dynamic memory function. As an example, there was used the project l2_cache_demo.

For memory allotment in memory DDR0 the following function is used:

osMalloc(BUFF_SIZE, OS_MEM_DDR0_SHARED);

In module os_config.h declared

#define OS_SHARED_MEM_DDR0_SIZE 0x1000000

OS_SHARED_MEM_DDR0_SIZE limits the max memory size which is allotted in external memory DDR0.

But the size DDR0 is 1GB.

Trying to change OS_SHARED_MEM_DDR0_SIZE more there is the mistake during compilation:

ERROR: Non-zero return status from "C:\Program Files\Freescale\CW SC v10.1\eclipse\\..\SC\StarCore_Support\compiler\bin\sc3000-ld.exe". l2_cache_core0 Unknown C/C++ Problem

Fatal(F1031): LCF configuration: in core c0, task task0_c0: virtual memory 'shared_data_ddr0_descriptor'(org=0x41000000, size=0x02000000) is not aligned to MATT/MMU constraints on address and size. os_msc815x_link.l3k l2_cache_core0/link_cmd line 54 C/C++ Problem

make: *** [../../l2_dbg.eld] Error 1 l2_cache_core0 line 0 C/C++ Problem

Could you please advise me how can I use the whole memory (1GB DRR0) and, accordingly, memory DDR1?

Thanks in advance!

[CrasyCat]

Hello

The linker files generated when you create a SDOS project with the project wizard as well as the demo projects delivered with SDOS are set up to use a portion of each memory area (M3. DDR0, DDR1) for core private data and the remaining part of memory as shared data.

According to the comment in memory_map_link.l3k mapping in each memory area looks as follows:

/****************************************************/

/* For each memory - the mapping will be as follows */

/****************************************************/

/* +------------------------------+ _LocalDataM_b */

/* | +--------------------------+ | */

/* | | Local partition core 0 | | */

/* | +--------------------------+ | */

/* | | Local partition core 1 | | */

/* | +--------------------------+ | */

/* | | Local partition core 2 | | */

/* | +--------------------------+ | */

/* | | Local partition core 3 | | */

/* | +--------------------------+ | */

/* | | Local partition core 4 | | */

/* | +--------------------------+ | */

/* | | Local partition core 5 | | */

/* | +--------------------------+ | */

/* +------------------------------+ _LocalDataM_e */

/* |                              | */

/* | Shared partition             | */

/* |                              | */

/* |                              | */

/* |                              | */

/* |                              | */

/* +------------------------------+ */

/* */

/****************************************************/

If you wish to use the whole DDR0 memory area as Shared heap, you need to adjust your .l3k files as well as the os_config.h to make sure there is nothing else allocated in DDR0 anymore. 

CrasyCat

[exciton]

Thanks for response!

I've looked through .l3k files.

If I understood correctly, the DDR0 Shared Memory size is 1Gb. That's what I need. It seems, all settings are right, but the local memory size is 16 Mb. OS_SHARED_MEM_DDR0_SIZE doesn't allow to allot more than 16 Mb.

Probably, the memory is alloted not in DDR0 Shared Memory, but in local memory, though I point out OS_MEM_DDR0_SHARED.

May be I make smthg in a wrong way.

Could you please explain, what I need to change in l3k files?