TMS570LC4357: not able to erase flash using F021 API

Hello,

I am trying to port working RM48 bootloader code to the TMS570LC4357.  The bootloader uses QJ Wang's bl_flash.c, bl_ymodem.c, etc files to download a file via UART and write it to flash.  For the TMS570LC4357, I am using F021 library F021_API_CortexR4_BE_L2FMC_V3D16.lib.  I verified that Registers.h is including Registers_FMC_BE.h. (big endian mode).  The library and bl_flash, bl_ymodem, etc objects are relocated at boot time and execute out of RAM.  Execution from RAM is working as expected.

The bootloader attempts to download a file and program it to flash starting at bank 0 sector 4 = flash address 0x20000.  This code runs fine on the RM48 HDK but not on the TMS570LC43x HDK board.

When I run the code and download a file the Fapi_initializeFlashBanks(), Fapi_setActiveFlashBank(), Fapi_enableMainBankSectors(), and Fapi_issueAsyncCommandWithAddress() execute and return success codes.  And the following while loops checking for FSM readybusy and status are executed and complete as expected.

while( FAPI_CHECK_FSM_READY_BUSY == Fapi_Status_FsmBusy );

while(FAPI_GET_FSM_STATUS != Fapi_Status_Success);

But the call to Flash_Erase_Check() fails. The CCS debugger memory window shows many words starting at location 0x20000 that are not all 0xFFFFFFFF.  I read a post that implies ECC, so I tried calling Fapi_disableAutoEccCalculation() just after the call to Fapi_initializeFlashBanks().  But that did not help the problem.  

I attached a screenshot of the debugger memory window after the erase operation showing the non-erased memory.  I also attached the slightly modified file bl_flash.c.  My changes are indicated with the tag //KRB

What is needed to erase flash on the 570LC4357?

Thank you,

Keith

5710.bl_flash.c