Hello @mƎALLEm or @JohannesK,
I'm very close to solution, as I explain above I can be able to load TestObject module to external NOR Flash using FMC. and also, able to execute everything if I perform copy external FLASH code to Internal RAM manually during init. But if I tried to run code directly from external Flash (XIP) then it doesn't work, so tried simple task
.ext_flash_xip :
{
. = ALIGN(4);
/* *TestObject*(.text .text*) */
/* *TestObject*(.rodata .rodata*) */
*(.ext_flash_xip*)
*(.ext_flash_xip)
. = ALIGN(4);
} >EXT_FLASH
Tried to keep only *TestObject*(.rodata .rodata*) and it works.
But if I tried to use only *TestObject*(.text .text*) then it doesnt work, so I tried to search and found that, the issue cause due to long jump from external flash to internal ram.
Crosscheck in .map file for that the functions of TestObject's are place at external address range.
So, I used flag (-mlong-calls) and now didn't crash the code, but it didn't run the function (Thread) which belongs to the external Flash.
I have tried to enable I and D-Cache and done below configuration for MPU. But nothing helps it.
void MPU_Config(void)
{
MPU_Region_InitTypeDef MPU_InitStruct = {0};
HAL_MPU_Disable();
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER0;
MPU_InitStruct.BaseAddress = 0x0;
MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
MPU_InitStruct.SubRegionDisable = 0x87;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
MPU_InitStruct.Number = MPU_REGION_NUMBER1;
MPU_InitStruct.BaseAddress = 0x64000000;
MPU_InitStruct.Size = MPU_REGION_SIZE_16MB;
MPU_InitStruct.SubRegionDisable = 0x0;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}
Mostly this issue cause due to using cpp object which causing long jump from external flash to internal ram and maybe it goes timeout and ignore/close the thread? So, I increase the timing to keep big buffer, but again it didn't help it.
hnor2.Instance = FMC_NORSRAM_DEVICE;
hnor2.Extended = FMC_NORSRAM_EXTENDED_DEVICE;
/* hnor2.Init */
hnor2.Init.NSBank = FMC_NORSRAM_BANK2;
hnor2.Init.DataAddressMux = FMC_DATA_ADDRESS_MUX_DISABLE;
hnor2.Init.MemoryType = FMC_MEMORY_TYPE_NOR;
hnor2.Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_16;
hnor2.Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_DISABLE;
hnor2.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_LOW;
hnor2.Init.WaitSignalActive = FMC_WAIT_TIMING_BEFORE_WS;
hnor2.Init.WriteOperation = FMC_WRITE_OPERATION_ENABLE;
hnor2.Init.WaitSignal = FMC_WAIT_SIGNAL_DISABLE;
hnor2.Init.ExtendedMode = FMC_EXTENDED_MODE_DISABLE;
hnor2.Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_DISABLE;
hnor2.Init.WriteBurst = FMC_WRITE_BURST_DISABLE;
hnor2.Init.ContinuousClock = FMC_CONTINUOUS_CLOCK_SYNC_ONLY;
hnor2.Init.WriteFifo = FMC_WRITE_FIFO_ENABLE;
hnor2.Init.PageSize = FMC_PAGE_SIZE_NONE;
/* Timing */
Timing.AddressSetupTime = 15;
Timing.AddressHoldTime = 15;
Timing.DataSetupTime = 200;
Timing.BusTurnAroundDuration = 15;
Timing.CLKDivision = 16;
Timing.DataLatency = 17;
Timing.AccessMode = FMC_ACCESS_MODE_A;
/* ExtTiming */
if (HAL_NOR_Init(&hnor2, &Timing, NULL) != HAL_OK)
{
Error_Handler( );
}
Please I need your guidance, what I'm missing here?
Thanks
