i.MX ProcessorsのトピックUSB Flash Drive Mounting

USB Flash Drive Mounting

samplej — Wed, 05 Jun 2019 22:03:23 GMT

I'm trying to read from a USB Flash Drive connected to the OTG port on a custom i.MX6Dual board running Android 7.1.1 and kernel 4.1.15. When I plug in the drive I get the following:

usb 1-1: new high-speed USB device number 3 using ci_hdrc
usb 1-1: New USB device found, idVendor=abcd, idProduct=1234
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1: Product: UDisk
usb 1-1: Manufacturer: General
usb 1-1: SerialNumber: 1404031203451902335914
usb-storage 1-1:1.0: USB Mass Storage device detected
scsi host1: usb-storage 1-1:1.0
usb 1-1: reset high-speed USB device number 3 using ci_hdrc
scsi 1:0:0:0: Well-known LUN 2| K 5 T b R ; c 0 0 w PQ: 5 ANSI: 2

I was expecting an sda to show up in /dev but nothing new shows up. Looking at the fstab.freescale file it looks like the mnt_point is set to auto - where should this mount to? I tried specifying a directory instead of auto but that didn't work either.

Thanks,

John

Re: USB Flash Drive Mounting

igorpadykov — Thu, 06 Jun 2019 23:09:50 GMT

Hi John

one can check voltage VDDUSB_CAP and USB_ID on connector (should be low)

and test if usb board is working, using simple linux usb unit test

(folder /mxc_usb_test)

imx-test

www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-test-5.7.tar.gz

Best regards
igor
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Re: USB Flash Drive Mounting

samplej — Fri, 07 Jun 2019 21:20:10 GMT

Hi Igor,

The hardware seems to be working - I'm able to connect a usb mouse and keyboard, as well as connect as a peripheral through adb. It's just in the case of the flash drive that I'm having an issue. It's recognized by the kernel it just doesn't show up in /dev.

John

Re: USB Flash Drive Mounting

samplej — Mon, 10 Jun 2019 21:09:44 GMT

The problem seems to be in the scsi driver, which doesn't seem to be parsing the device's information correctly during the scan:

scsi 1:0:0:0: Well-known LUN 2| K 5 T b R ; c 0 0 w PQ: 5 ANSI: 2

On my Ubuntu machine I get the following:

scsi 5:0:0:0: Direct-Access General UDisk 5.00 PQ: 0 ANSI: 2

I haven't figured out what's causing this though.