How do I write a 0 CRC to the bootloader settings when flashing the application using J-Link?

RE: How do I write a 0 CRC to the bootloader settings when flashing the application using J-Link?

Nguyen Hoan Hoang — Mon, 13 Apr 2015 03:45:29 GMT

By default the region 3fc00 is all set to 0. All you need to do is set the first byte to 1 for valid app. If you really need to set CRC to 0, It is at 3fc04.

RE: How do I write a 0 CRC to the bootloader settings when flashing the application using J-Link?

RK — Mon, 13 Apr 2015 00:55:25 GMT

Well looking at the code

dfu_types.h:#define BOOTLOADER_SETTINGS_ADDRESS     0x0003FC00    

uint8_t  m_boot_settings[CODE_PAGE_SIZE] __attribute__((at(BOOTLOADER_SETTINGS_ADDRESS))) __attribute__((used));

void bootloader_util_settings_get(const bootloader_settings_t ** pp_bootloader_settings)
{
    // Read only pointer to bootloader settings in flash. 
    static bootloader_settings_t const * const p_bootloader_settings =  (bootloader_settings_t *)&m_boot_settings[0];        
*pp_bootloader_settings = p_bootloader_settings;
}

typedef struct
{
    bootloader_bank_code_t bank_0;          
    uint16_t               bank_0_crc;    
....
} bootloader_settings_t

it's at 0x3FC00 + the offset to bank_0_crc which, as it's 16-bit aligned, I would guess is 2

RE: How do I write a 0 CRC to the bootloader settings when flashing the application using J-Link?

Eliot Stock — Mon, 13 Apr 2015 00:42:54 GMT

Fine, but what's the address of the CRC? I have this region in my linker script:

bootloader_settings (rwx) : ORIGIN = 0x0003FC00, LENGTH = 0x400

RE: How do I write a 0 CRC to the bootloader settings when flashing the application using J-Link?

RK — Mon, 13 Apr 2015 00:37:47 GMT