Hello!
Using Matlab R2025b, Simulink and MBDT for S32K3 version 1.7.1 here.
To optimize the performance of a motor controller application we are developing we want to place some parts of the code into the ITCM memory and later on, DTCM memory for data.
As for now, for testing the workflow, I am trying to get a function placed into ITCM memory. I managed to get Simulink/ embedded coder to place the correct pragma statements in to the c code like:
#pragma GCC section text ".itcm_text"
static void Motor_Drive_Subsystem(void)
{
..........
}
#pragma GCC section text ""
However, when compiling the application gcc ignore these pragma statements and places the code in the standard .text segment. This can be concluded with The objdump command:
arm-none-eabi-objdump -h Motor_Control.o (beeing the .o file generated from the c-file containing the Motor_Drive_Subsystem function)
There are no .itcm_text in the list just .text.xxxx segments (among the other non text segments).
When compiling I use the standard switches for gcc set by the MBDT environment:
arm-none-eabi-gcc -O2 -c -std=c99 -fshort-enums -funsigned-char -fstack-usage -ffunction-sections -fdata-sections -g -pedantic -Wall -Wextra -fmessage-length=0 -funsigned-bitfields -fno-common -Wunused -Wstrict-prototypes -Wsign-compare -Werror=implicit-function-declaration -mcpu=cortex-m7 -mthumb -mlittle-endian -mfloat-abi=hard -mfpu=fpv5-sp-d16 -DD_CACHE_ENABLE -DI_CACHE_ENABLE -specs=nano.specs -specs=nosys.specs --sysroot="C:\MATLAB_Add-Ons\Toolboxes\NXP_MBDToolbox_S32K3\tools\build_tools\gcc_v10.2\gcc-10.2-arm32-eabi\arm-none-eabi\newlib" -DSTEP_GPT_TIMER -DSTEP_GPT_CHANNEL=GptConf_GptChannelConfiguration_StepTimer -DSTEP_GPT_CHANNEL_FREQ=40000000 -DSTEP_GPT_CHANNEL_VALUE_MAX=4294967295 -DAUTOSAR_OS_NOT_USED -D__MW_TARGET_USE_HARDWARE_RESOURCES_H__ -DGCC -DS32K3XX -DS32K396 -DCPU_S32K396 -DENABLE_FPU -DMPU_ENABLE -DMBDT_INIT -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTERMFCN=0 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DMT=0 -DTID01EQ=0 -DSTACK_SIZE=64 -DRT -DMODEL=Motor_Control -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -IC: .....
By modifying the generated c code file and manually compiling it I can conclude the following:
Removing the “static” declaration of the function does not help. However, removing “static” and using the alternative way for this by adding an attribute statement on the function:
static void __attribute__((section(".itcm_text")))Motor_Drive_Subsystem(void);
will create a .itcm_text segment in the .o file.
I am not sure if I am doing something wrong here or if it is a tool problem.
Can someone guide me on how to get this working?
Of course, we want the tool chain to handle this and do not want to manually modify the c code after code generation.
As far as I can see it looks like the startup_cm7.s and linker_flash_s32k396.ld files are prepared for handling the ITCM and DTCM memories.
I found this post in the forum, not sure if it is relevant for this: https://community.nxp.com/t5/S32-Design-Studio/No-GCC-11-4-item-in-new-project-wizard-dialog-on-S32D...
The MBDT gcc seems to be build 1728 where as the fixed one in the post is build 1803.
Thanks in advance!
