RTOS/RM48L952: Frtos HEAP on RM48L952 SDRAM

Claudio Lei

Part Number: RM48L952

Tool/software: TI-RTOS

Hi,

I'm trying to use an external SDRAM for allocate 8 MB of HEAP (Full size is 16MB, other 8MB is for my RAMDisk), as my product will be storing big data on the RAM, so I need to allocate a lot of memory.

My SDRAM is already tested and should work correctly and my RAMDisk with FRTOS FAT16 as well.

This thread has almost the same problem but no solution: e2e.ti.com/.../371084

I tried many things to place the RTOS Heap into the SRDAM, but it always ended in a abort after prvSetupDefaultMPU(); or vPortStartFirstTask(); in "os_port.c "

I tried it with the "os_heap.c" and with "heap_5.c" .

I also expanded the MPU settings in prvSetupDefaultMPU(); with

prvMpuSetRegion(portPRIVILEGED_RAM_REGION, 0x80000000, portMPU_SIZE_16MB | portMPU_REGION_ENABLE, portMPU_PRIV_RW_USER_RW_EXEC | portMPU_NORMAL_OIWTNOWA_SHARED);

but it also ended with an abort after prvSetupDefaultMPU();

Is it possible to put the heap on the SDRAM or is there still a problem with the HW like in the thread above?

Thanks.

over 7 years ago

0 QJ Wang over 7 years ago

TI__Guru**** 196816 points

Hello Claudio,

Can you please check the revision of the device for me? The RevC or early rev has a bug which is listed in the errata (page 30 Device#B064, SPNZ196G.pdf).

0 Claudio Lei over 7 years ago in reply to QJ Wang

Prodigy 90 points

Hello Mr. Wang

Thank you for your answer. My device has the revision code D.

0 QJ Wang over 7 years ago in reply to Claudio Lei

TI__Guru**** 196816 points

Hello Claudio,

Can you please try several different settings:

1. portMPU_NORMAL_OIWTNOWA_SHARED --> STRONGLYORDERED_SHARED

RM48 devices don't have cache, so OIWTNOWA is not applicable

2. use of --no_stm compile option

0 Claudio Lei over 7 years ago in reply to QJ Wang

Prodigy 90 points

Hello Mr. Wang

Thank you for your suggestion.

I tried first only the MPU settings without the "no_stm" flag. but it failed after pervMpuEnable();

With the "no_stm" flag the program wil stuck in ((esmREG->SR1[2]) != 0U) at "sys_startup.c"

0 QJ Wang over 7 years ago in reply to Claudio Lei

TI__Guru**** 196816 points

Thanks for updating.

1. I will investigate on my board, but may not reproduce the issue

2. Can you please check the value in SR1[2] (ESMSR3, ESM group3 error)?

0 Claudio Lei over 7 years ago in reply to QJ Wang

Prodigy 90 points

if I'm right, you can see in the picture, i am getting with the "--no_stm" flag an "RAM even bank (B0TCM) - ECC uncorrectable error".

0 QJ Wang over 7 years ago in reply to Claudio Lei

TI__Guru**** 196816 points

Hello Claudio,

It may be caused by the conflicting region number for RAM and SDRAM. You use #2 (portPRIVILEGED_RAM_REGION) for the region at 0x08000000 and the region at 0x80000000.

0 Claudio Lei over 7 years ago in reply to QJ Wang

Prodigy 90 points

Hello Mr. Wang

Thank you for your answer. Your hint solved my problem.

i added in os_port.c in function "prvSetupDefaultMPU" this code with a diffrent region

prvMpuSetRegion(portPRIVILEGED_SDRAM_REGION, 0x80000000, portMPU_SIZE_32MB | portMPU_REGION_ENABLE, portMPU_PRIV_RW_USER_RO_EXEC | portMPU_STRONGLYORDERED_SHAREABLE);

portPRIVILEGED_SDRAM_REGION i defined it with another number.

Regards c.lei

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RTOS/RM48L952: Frtos HEAP on RM48L952 SDRAM