Using openbootloader & softdevice to switch two app

[IanChen]

Hi,

I's trying to implement switch two application firmware in the openbootloader example, but I meet some issue.

I change the sector to 0x27000 in App1, 0x40000 in App2, the bootloader is default to open the 0x27000 in softdevice S140, I change the vector to 0x40000 in the openbootloader.

Modify code as below:

in "brf_bootloader_app_start.c" :

line 76: nrf_bootloader_app_start(0x40000);

in "nrf_dfu_mbr.c"

line 84: uint32_t address = 0x40000;

But nrf52840 can't bootup with App2, how can I modify the bootloader to support this feature?

Thank you.

[Simonr]

Hi

As explained in this case, which seems to be very similar to yours, you can jump from the bootloader to your firmware with the following function:

static sd_mbr_command_t init_sd_command = {SD_MBR_COMMAND_INIT_SD, };

void jump_to_fw(uint32_t fwaddr)
{
	sd_mbr_command(&init_sd_command);
	sd_softdevice_vector_table_base_set(fwaddr);
	uint32_t app_start_ptr = ((uint32_t *)fwaddr)[1];  // get start address from vector table
	((void (*)()) app_start_ptr) ();
}

Best regards,

Simon

[IanChen]

Hi,

I have try this command, but I still can't jump the address except 0x27000.

Is there any loss in the app FW?

I only modify the *.icf file, __ICFEDIT_intvec_start__ and __ICFEDIT_region_ROM_start__.