Hi, [quote userid="577647" url="~/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1436533/msp432e401y-msp432-custom-bootloader"]I referred some examples from Resource Explorer in which it is implemented in Assembly language(bl_startup_css.s).[/quote] The bl_start_ccs.s file is a startup file and depends on the configuration in the bl_config.h file will boot and load your firmware from the specified serial port (e.g. Ethernet, UART, SPI or others). See below snippet of code in bl_startup_ccs.s file. If you define ENET_ENABLE_UPDATE in the bl_config.h file then the startup file will jump to the UpdateBOOTP function. The UpdateBOOTP function is in the bl_emac.c file. You can look at bl_emac.c file to see how the firmware is programmed to the flash. [quote userid="577647" url="~/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1436533/msp432e401y-msp432-custom-bootloader"] 1. For FPGA, there is driver given from Lattice which is written in embedded C. So I think i have to modify the assembly language code to c. Is my understanding right? Or is there any other way to proceed further? [/quote] What is the role of your FPGA? Are you trying to update firmware to the internal flash or external FPGA? I don't suggest you convert the bl_startup_ccs.s which is already proven working to C. Why don't you just add a function call in bl_startup_ccs.s file to do whatever you want with your FPGA. Look at the bl_config.h where you can define and plug your custom functions using #define BLXXX_FN_HOOK. Before you do anything, I will suggest your run the EMAC bootloader example as-is. Make sure it works before you add new capabilities. [quote userid="577647" url="~/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1436533/msp432e401y-msp432-custom-bootloader"]2. In the existing Bootloader code, the Bootp request is sent from the microcontroller and the PC tool should reply to that request. If there is a reply then the updatehandler will update firmware image sent from the PC Tool. Please correct me if i'm wrong.[/quote] Your understanding is correct.
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