Failed to open flash area ID 2 (image 0 slot 1): -19, cannot continue

Question

Hello,

We're seeing an error that only happens after a cold reboot (unplugging the battery and replugging it) and it happens inside the bootloader while trying to open the secondary flash area in the external flash. I think. If I change the bootloader code inside `bootloader/mcuboot/boot/bootutil/src/loader.c` to reset Nordic instead of panicking, it's recovering fine (i.e. calling NVIC_SystemReset() instead of FIH_PANIC)

I'm using w25q64 for flash and QSPI to communicate with the flash.

The error message is:

E: Failed to open flash area ID 2 (image 0 slot 1): -19, cannot continue

I'm using the following DTS overlay:

/ {
 chosen {
 nordic,pm-ext-flash = &w25q64;
 };
};

&qspi {
 status = "okay";
 pinctrl-0 = <&qspi_default>;
 pinctrl-1 = <&qspi_sleep>;
 pinctrl-names = "default", "sleep";
 w25q64: w25q6435f@0 {
   compatible = "nordic,qspi-nor";
   reg = <0>;
   sck-frequency = <8000000>;
   jedec-id = [ef 40 17];
   sfdp-bfp = [
     e5 20 f9 ff ff ff ff 03 44 eb 08 6b 08 3b 42 bb
     fe ff ff ff ff ff 00 00 ff ff 40 eb 0c 20 0f 52
     10 d8 00 00 36 02 a6 00 82 ea 14 c4 e9 63 76 33
     7a 75 7a 75 f7 a2 d5 5c 19 f7 4d ff e9 30 f8 80
   ];
   size = <67108864>;
   has-dpd;
   t-enter-dpd = <10000>;
   t-exit-dpd = <35000>;
 };
};

Any pointers would be much appreciated.