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Hi,
We are using the F021 flash library to program or erase the TMS570LC4357 controller.
However, when we erase a flash location, we don't see all locations have 0xFF's and instead we see 0xFFF7FFFF or some other bits in the erase flash locations are zeros.
We understand that it could be due to the flash ECC issue but not sure which function to call for enabling ECC or autogenerate ECC when erasing flash using the F021 library.
Also, we load images using the UNIFLASH tool with the auto ECC enabled option and could see all the flash regions erase by the UNIFLASH tool have FFs, but when erase using the F021 library it is not the case.
Note: Flas API functions used: fapi_issue_async_cmd_with_addres() funciton with FAPI_ERASE_SECTOR command
Please let me know if we are missing anything.
Hello Srihari,
Yes, it is caused by the flash ECC. When main flash is erased, the ECC space is also erased. This means that the erased flash has invalid ECC.
You can generate the ECC for the whole flash using linker cmd file.
Attached is the example of linker cmd file used for LC43x device:
/*----------------------------------------------------------------------------*/
/* Linker Settings */
--retain="*(.intvecs)"
/* USER CODE BEGIN (1) */
/* USER CODE END */
/*----------------------------------------------------------------------------*/
/* Memory Map */
MEMORY
{
/* USER CODE BEGIN (2) */
//#if 0
/* USER CODE END */
/*
VECTORS (X) : origin=0x00000000 length=0x00000020
FLASH0 (RX) : origin=0x00000020 length=0x001FFFE0
FLASH1 (RX) : origin=0x00200000 length=0x00200000
STACKS (RW) : origin=0x08000000 length=0x00001500
RAM (RW) : origin=0x08001500 length=0x0007EB00
*/
/* USER CODE BEGIN (3) */
//#endif
//#if 1
VECTORS (X) : origin=0x00000000 length=0x00000020 fill = 0xffffffff
FLASH0 (RX) : origin=0x00000020 length=0x001FFFE0 vfill = 0xffffffff
FLASH1 (RX) : origin=0x00200000 length=0x00200000 vfill = 0xffffffff
/* Bank 7 (128kB, FEE) */
FLASH7 (R) : origin=0xF0200000 length=0x00020000 vfill = 0xffffffff
STACKS (RW) : origin=0x08000000 length=0x00001500
RAM (RW) : origin=0x08001500 length=0x0002EB00
/* Bank 0 ECC */
ECC_VEC (R) : origin=(0xf0400000 + (start(VECTORS) >> 3))
length=(size(VECTORS) >> 3)
ECC={algorithm=algoL2R5F021, input_range=VECTORS}
ECC_FLA0 (R) : origin=(0xf0400000 + (start(FLASH0) >> 3))
length=(size(FLASH0) >> 3)
ECC={algorithm=algoL2R5F021, input_range=FLASH0 }
/* Bank 1 ECC */
ECC_FLA1 (R) : origin=(0xf0400000 + (start(FLASH1) >> 3))
length=(size(FLASH1) >> 3)
ECC={algorithm=algoL2R5F021, input_range=FLASH1 }
/* Bank 7 ECC */
ECC_FLA7 (R) : origin=0xF0100000
length=(size(FLASH7) >> 3)
ECC={algorithm=algoL2R5F021, input_range=FLASH7 }
//#endif
/* USER CODE END */
}
/* USER CODE BEGIN (4) */
#if 1
ECC {
algoL2R5F021 : address_mask = 0xfffffff8 /* Address Bits 31:3 */
hamming_mask = R4 /* Use R4/R5 build in Mask */
parity_mask = 0x0c /* Set which ECC bits are Even and Odd parity */
mirroring = F021 /* RM57Lx and TMS570LCx are build in F021 */
}
#endif
/* USER CODE END */
/*----------------------------------------------------------------------------*/
/* Section Configuration */
SECTIONS
{
/* USER CODE BEGIN (5) */
#if 0
/* USER CODE END */
/*
.intvecs : {} > VECTORS
.text align(32) : {} > FLASH0 | FLASH1
.const align(32) : {} > FLASH0 | FLASH1
.cinit align(32) : {} > FLASH0 | FLASH1
.pinit align(32) : {} > FLASH0 | FLASH1
.bss : {} > RAM
.data : {} > RAM
.sysmem : {} > RAM
FEE_TEXT_SECTION : {} > FLASH0 | FLASH1
FEE_CONST_SECTION : {} > FLASH0 | FLASH1
FEE_DATA_SECTION : {} > RAM
*/
/* USER CODE BEGIN (6) */
#endif
#if 1
.intvecs : {} palign=8 > VECTORS
.text : {} palign=8 > FLASH0 | FLASH1 /* Executable code and constants */
.const : {} palign=8 > FLASH0 | FLASH1 /* Global and static const variables that are explicitly initialized */
.cinit : {} palign=8 > FLASH0 | FLASH1 /* Tables for explicitly initialized global and static variables */
#ifdef __TI_EABI_SUPPORT__
.init_array : {} palign=8 > FLASH0 | FLASH1 /* C++ global constructor addresses */
#else /* TI_ARM9_ABI and TIABI */
.pinit : {} palign=8 > FLASH0 | FLASH1 /* C++ global constructor addresses */
#endif
.stack : {} > STACKS /* Stack */
.bss : {} > RAM /* Uninitialized global and static variables */
.data : {} > RAM /* Global and static non-const variables that are explicitly initialized. */
.sysmem : {} > RAM /* Memory pool (heap) for dynamic memory allocation */
#endif
/* USER CODE END */
}
