We are trying to understand whether it is possible to use our external flash drive at45db641e to implement DFU and then load the application firmware via Bluetooth.
As far as I know, the at45db641e is not an SPI NOR, and I was able to add it to the project by analogy with the existing example:
https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-9-bootloaders-and-dfu-fota/topic/exercise-3-dfu-with-external-flash/
We defined the external flash in the .overlay file as:
&spi2 {
status = "okay";
pinctrl-0 = <&spi2_default>;
pinctrl-1 = <&spi2_sleep>;
pinctrl-names = "default", "sleep";
cs-gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
at45db0: at45db641e@0 {
compatible = "atmel,at45";
reg = <0>;
spi-max-frequency = <15000000>;
jedec-id = [1f 28 00];
size = <67108864>;
sector-size = <262144>;
block-size = <2048>;
page-size = <256>;
enter-dpd-delay = <2000>;
exit-dpd-delay = <100000>;
status = "okay";
#address-cells = <1>;
#size-cells = <1>;
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
ext_flash_area: partition@0 {
label = "external_flash";
reg = <0x00000000 0x0800000>; /* 8 MB */
};
};
};
};
and by analogy, for mcuboot.overlay.
Can we use this ext flash? If so, what files should we attach to you for analyze?
