Issue: USB MSC with FATFS on nRF54H20 External Flash (Write Error & SCSI Opcode 0xa1)

[kile.gc]

Description: I am implementing USB Mass Storage with a FAT filesystem on external MX25UW63 flash (via EXMIF) using the nRF54H20 DK (NCS v3.2.0).

Setup:

• Board: nRF54H20 DK

• SDK: nRF Connect SDK v3.2.0

• Reference: zephyr/samples/subsys/usb/mass

Configuration:

nrf54h20dk_nrf54h20_cpuapp.overlay:

/delete-node/ &storage_partition;

&exmif {
	status = "okay";
};

&gpio6 {
	status = "okay";
};

&mx25uw63 {
	status = "okay";

    partitions {
		compatible = "fixed-partitions";
		#address-cells = <1>;
		#size-cells = <1>;

		storage_partition: partition@0 {
			label = "storage";
			reg = <0x00000000 0x00020000>;
		};
	};
};

/ {
	msc_disk0 {
		compatible = "zephyr,flash-disk";
		partition = <&storage_partition>;
		disk-name = "NAND";
		cache-size = <4096>;
	};
};

nrf54h20dk_nrf54h20_cpuapp.conf:

CONFIG_APP_MSC_STORAGE_FLASH_FATFS=y

Error Log:

*** Booting nRF Connect SDK v3.2.0-5dcc6bd39b0f ***
*** Using Zephyr OS v4.2.99-a57ad913cf4e ***
Area 0 at 0x0 on mx25uw6345g@0 for 131072 bytes
[00:00:00.024,795] <inf> flashdisk: Initialize device NAND
[00:00:00.024,800] <inf> flashdisk: offset 0, sector size 512, page size 65536, volume size 131072
[00:00:00.024,806] <err> flashdisk: Cache too small (4096 needs 65536)
[00:00:00.024,812] <err> fs: fs mount error (-5)
[00:00:00.024,816] <err> main: Failed to mount filesystem
[00:00:00.024,915] <wrn> udc_dwc2: VBUS is not ready, block udc_enable()
[00:00:00.060,241] <wrn> udc_dwc2: Experimental DMA enabled
[00:00:00.060,287] <inf> main: The device is put in USB mass storage mode
[00:00:00.403,512] <inf> usbd_msc: Enable
[00:00:00.403,577] <inf> usbd_msc: Bulk-Only Mass Storage Reset
[00:00:01.456,398] <err> usbd_msc: Unknown SCSI opcode 0xa1

Current Status:

I initially had a cache error, which I resolved by increasing the cache size to 65536. However, I am now facing two issues:

1. Write Failure: When I try to create a file on the disk, the operation fails with the following log:

   [INSERT FILE CREATION ERROR LOG HERE]
   

2. SCSI Error: I also see this error in the logs:

   [00:00:01.594,387] <err> usbd_msc: Unknown SCSI opcode 0xa1
   

Questions:

• What could be causing the file creation/write failure?

• What does Unknown SCSI opcode 0xa1 mean in this context? Is it critical?

Any advice is appreciated.

[Simonr]

Hi

The image you uploaded shows a v0.9.1 DK (see the sticker for future reference). 

You say you're powering it from USB, which USB port exactly?

I just did a brief test on mounting the board yesterday. I'll test again tomorrow to see if I'm able to reproduce this again, but I don't see anything obviously wrong in your setup. 

Best regards,

Simon

[kile.gc]

Hi Simon,

Thanks for checking the board version - I'll note that it's v0.9.1 for reference.

Regarding the USB ports, I've tested both scenarios:

1. Powering the debugger USB first, then plugging in the nRF54H20 USB later
2. Using only the nRF54H20 USB port

Both show the same error result.

Did you use the project files I attached earlier when testing?

Best regards,
Kittitouch