RTC INT and SVC are not work when APP is not at offset 0x1C000 with S113

[Xavier1979]

For study purpose, I try to change bootloader to move APP offset by

• change APP start address to 0x20000
• change start_addr in nrf_dfu_mbr_irq_forward_address_set() and nrf_bootloader_app_start() from MBR_SIZE to 0x20000, and I can see the main function is be executed. But the SW is not running correctly. After checked, I found two issues:

(1) After RTC initialized, no RTC INT handler be executed;

(2) When enable Soft device, it is not returned from SVC instruction;

The same APP if move back to 0x1C000, and change start_addr to MBR_SIZE, then it can work correctly.

Which means the issue is due to bootloader? Is anything I need to check?

[Susheel Nuguru]

nrf_bootloader_app_start sets the app_start address which seems to be working for your app as you confirmed that the main function is started in the app even after your moved the app_start offset.

Did nrf_dfu_mbr_irq_forward_address_set  return without any errors? It does not look like this function has done what it is supposed to do after successful complettion.

[Xavier1979]

Hi, 

I can reproduce the same issue with S132 secure DFU bootloader w/o moving APP (NRF SDK example). 
What I changed is only change "start_addr" in nrf_bootloader_app_start() and nrf_dfu_mbr_irq_forward_address_set() from MBR_SIZE to 0x26000  (which is the default APP offset if apply S132).

The symptom is APP is stocked at 0x000263D2 (SVC_Handler) when call nrf_sdh_enable_request(), and never returned, and there is no error returned from nrf_dfu_mbr_irq_forward_address_set() in bootloader.

[Susheel Nuguru]

You need to use an MBR command for sd init after you have reached the application

sd_mbr_command_t command =
    {
        .command = SD_MBR_COMMAND_INIT_SD
    };
    ret_val = sd_mbr_command(&command);

[Xavier1979]

Hi,

I try to add this MBR command at the begin of my main().

But it is failed, it stocked at Hardfault_Handler() after execute "SVC 0x18" when call sd_mbr_command()

[Einar Thorsrud]

Hi,

There are several things that needs to be accounted for when jumping to an application rather than the SoftDevice (which in turn starts the application immediately after). Please see this thread and also this post.