Bootloader setup

[yon]

I'm working on a custom bootloader; below is the step taken but it doesn't workout:

1. By using a working UART example, change the linker script:

MEMORY { FLASH (rx) : ORIGIN = 0x7B000, LENGTH = 0x2B000 RAM (rwx) : ORIGIN = 0x20001F00, LENGTH = 0x6100 } 2. Flash the "dfu_test_softdevice_w_bootloader_b_hci_s132.hex" with jlink commander. 3. Check the UICR, softdevice and application by nrfjprog: (All written in correct addresses)

C:\WINDOWS\system32>nrfjprog --readuicr C:\CM\uicr.txt Reading UICR. Storing data in C:\CM\uicr.txt.

C:\WINDOWS\system32>nrfjprog --readcode C:\CM\flash.txt Reading flash. Storing data in C:\CM\flash.txt.

4. Reset the DK board.

But it doesn't work at all.

Please help me on this.

Thanks

[bjorn-spockeli]

Hi Yon, if you are using SDK v11.0.0 and S132 v2.0.0 then you should use the following linkerscript settings for the application

MEMORY
{
  FLASH (rx) : ORIGIN = 0x1c000, LENGTH = 0x5E000
  RAM (rwx) :  ORIGIN = 0x20002080, LENGTH = 0xdf80
}

[yon]

Thank for your reply.

We make use of example from nRF5_SDK_11.0.0_89a8197\examples\dfu\bootloader; and we are using Eclipse with arm gcc complier.

What we have done: (using softdevice s132)

1. Modified the main.c to print DFU_BANK_0_REGION_START to uart console(putty); get 0x0001C000.

2. Build blinky example with:

   FLASH (rx) : ORIGIN = 0x1C000, LENGTH = 0x9000 RAM (rwx) : ORIGIN = 0x20002080, LENGTH = 0x6000

3. Add bootloader_app_start(DFU_BANK_0_REGION_START); after "print DFU_BANK_0_REGION_START" code.

4. Flash and run, uart console get 0x0001C000 but not jumping to blinky example.

[bjorn-spockeli]

You need to call the following snippet before calling bootloader_app_start()

sd_mbr_command_t com = {SD_MBR_COMMAND_INIT_SD, };

err_code = sd_mbr_command(&com);
APP_ERROR_CHECK(err_code);

This will configure the MBR to forward interrupts to the SoftDevice, which in turn will forward them to the application.

Note: The SD_MBR_COMMAND_INIT_SD can only be issued once to the MBR, so if the application ran ble_stack_init() before jumping to the bootloader, then this snippet should not be run in the bootloader.

[yon]

Excellent! It work perfectly now. Thank you very much.

[yon]

so if in my app i didn't call ble_stack_init(), i can put the same snippet to jump back from app to bootloader?