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

I ran the sample today on an nRF54H20 DK, but I'm not able to recreate this issue, It seems to be able to mount just fine on my side, and the unknown SCSI opcode does not appear.

*** 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
[00:00:00.099,714] <inf> flashdisk: Initialize device NAND
[00:00:00.105,582] <inf> flashdisk: offset 0, sector size 512, page size 65536, volume size 131072
Mount /NAND:: 0
/NAND:: bsize = 512 ; frsize = 512 ; blocks = 128 ; bfree = 128
/NAND: opendir: 0
End of files
[00:00:00.175,329] <wrn> udc_dwc2: VBUS is not ready, block udc_enable()

What version of the nRF54H20 DK are you working on here? How is it powered, and can you confirm all the jump cables on the headers are on?

Best regards,

Simon

[kile.gc]

Hi Simon,

I believe I have nRF54H20 DK v0.7.0 (you can check the DK in the attached image). I believe I've connected all the jumpers that I possibly can.

Regarding power: I'm powering it via USB.

For Ironside SE: I'm using nrf54h20_soc_binaries_v23.1.2+21.zip

Here is my board configuration



Additional questions:

• The SCSI opcode error appears when I connect the USB cable to the device
• Have you tried creating a file on the drive using a PC? Any success?
• I also get no errors without performing these steps (creating/writing files)

Best regards,
Kittitouch