Using Zephyr and dual-QSPI with the nRF52840-MDK to access the MX25R64 flash

Products & Technology
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Has anyone tried to use dual-QSPI and Zephyr with the nRF52840-MDK to use the MX25R64 flash?

I am looking to get a development board to use and help me while I am porting Zephyr to my custom board and the nRF52840-MDK looks like a good option if the flash can be successfully used with dual-QSPI.

I have a custom, known good circuit, that uses dual-QSPI and an nRF52840 with the MX25R64 that I am trying to start using with Zephyr and I am having problems getting Zephyr to see the flash. In the past I have used it successfully with C, hence the “known good” statement.

Following is the QSPI section of my device tree.

&qspi {
status = "okay";
sck-pin = <31>;
io-pins = <30 45>;
csn-pins = <29>;
mx25r64: mx25r6435f@0 {
	compatible = "nordic,qspi-nor";
	reg = <0>;
	quad-enable-requirements = "NONE";
	/* MX24R64 supports only pp and pp4io */
	writeoc = "pp";
	/* MX24R64 supports all readoc options */
	readoc = "fastread";
	sck-frequency = <8000000>;
	label = "MX25R64";
	jedec-id = [c2 28 17];
	sfdp-bfp = [
		e5 20 f1 ff  ff ff ff 03  44 eb 08 6b  08 3b 04 bb
		ee ff ff ff  ff ff 00 ff  ff ff 00 ff  0c 20 0f 52
		10 d8 00 ff  23 72 f5 00  82 ed 04 cc  44 83 68 44
		30 b0 30 b0  f7 c4 d5 5c  00 be 29 ff  f0 d0 ff ff
	];
	size = <67108864>;
	has-dpd;
	t-enter-dpd = <10000>;
	t-exit-dpd = <35000>;
};

and my prj.conf settings are

CONFIG_NORDIC_QSPI_NOR=y
CONFIG_NORDIC_QSPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096
CONFIG_DEBUG=y
CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_FLASH_PAGE_LAYOUT=y