Debugging Serial UART Bootloader SDK 15.3

Question

Hi, 
 I am currently working on a project for which I use the Secure Serial UART Bootloader from SDK 15.3 (nRF5_SDK_15.3.0_59ac345\examples\dfu\secure_bootloader\pca10040_uart), slightly modified to fit my custom board embedding a nRF52832 chip (pinout, RX buffer size...). 
 My problem is, after having erased non-volatile memory and program SoftDevice 6.1.1 with nrfjprog, I can't seem to debug the bootloader with Keil. I have the error: 
 Error: Flash Download failed - "Cortex-M4" 
 when trying to download firmware or debug. 
 Settings are as follow: 
 - Defined "DEBUG" as preprocessor symbol. 
 - Optimization level 0. 
 - IROM1 start address: 0x69000, size: 0xD100 (I added some files hence the size). 
 - Using J-LINK / J-TRACE Cortex to debug. 
 
 Thank you for your help.

bjorn-spockeli · Accepted Answer

I think its still because Keil is erasing the MBR flash page. Could you try to do the following modifications to the bootloader code 
 // Comment out the m_uicr_mbr_params_page_address declearation in nrf_dfu_settings.c, i.e. 

#if defined ( __CC_ARM )

 // uint32_t const m_uicr_mbr_params_page_address
 // __attribute__((at(NRF_UICR_MBR_PARAMS_PAGE_ADDRESS))) = NRF_MBR_PARAMS_PAGE_ADDRESS;

#elif defined ( __GNUC__ ) || defined ( __SES_ARM )

// Change MBR_BOOTLOADER_ADDR in nrf_mbr.h from 0xFF8 to 0x10001014

/** @brief Location (in the flash memory) of the bootloader address. */
#define MBR_BOOTLOADER_ADDR (0x10001014) //(0xFF8) 
 Doing this I was able to debug the bootloader in Keil. What I have essentially done is to prevent the BL from writing to the MBR region.

Debugging Serial UART Bootloader SDK 15.3

Top Replies