Debugger often hangs on FIH_PANIC

[hubert_11]

Often when I try to add a breakpoint while debugging the asset tracker example for the Thingy 91, I end up stuck in "FIH_PANIC" in the debugger.

Sometimes breakpoints do work tough, and if I remove the breakpoint that seemingly caused me to end up in FIH_PANIC, the debugger also works again. I also can't find any logic in when adding breakpoints causes it to hang and when it doesn't.

I tried both SDK and toolchain 2.1.1 and the latest 2.2.0 version.

This is where the debugger ends up in when it hangs:

    if (fih_not_eq(fih_rc, FIH_SUCCESS)) {
        BOOT_LOG_ERR("Unable to find bootable image");

        mcuboot_status_change(MCUBOOT_STATUS_NO_BOOTABLE_IMAGE_FOUND);

        FIH_PANIC;
    }

    BOOT_LOG_INF("Bootloader chainload address offset: 0x%x",
                 rsp.br_image_off);

[Simonr]

Hi

Where do you set breakpoints that result in this FIH_PANIC? I think you're setting breakpoints that interferes with the check where this is from (the init of the boot console and waiting for the boot image check to finish). You shouldn't set breakpoints before the image is booted and application is up and running properly.

Best regards,

Simon

[hubert_11]

There didn't seem to be any specific points, sometimes breakpoints in the same points that used to work before also started to cause this behaviour. However, it somehow seems to be fixed for me (perhaps because I since migrated to version 2.2.0).

[Simonr]

Hm, sounds strange, but I'm glad it's no longer an issue for you, let us know if you see it again and how to reproduce it on our end so we can investigate if necessary.

Best regards,

Simon