Hi Apologies for my first post here being a request for help, but after extensive searching online I've not yet been able to find and answer and am hopeful the expertise here may be able to help! I have a Raspberry Pi Zero W that I'm using in OTG/gadget mode. I've activated dwc2 USB, partitioned and formatted the file that is to be used as filesystem and loaded g_mass_storage. It is working fine in Windows - I can connect and see the contents, add/delete files, eject and reconnect seeing changes fine. I can mount it in Raspbian to check contents and can also attach it to other devices and interact with it fine. However, I've got some devices that are very picky about what USB devices they will connect to (solely flash drives). The problem is the OTG mass storage gadget is being identified as "File-Stor Gadget (Rev: 0404)" for device type, which is causing it to be rejected. I can successfully use a USB flash drive in the target devices and have scraped the vendor/product ID, etc from this flash drive to see if I can mimic them via g_mass_storage. I have adjusted modprobe to the following: $ sudo modprobe g_mass_storage file=/home/pi/piusb.bin stall=0 removable=1 idVendor=0x0781 idProduct=0x5572 bcdDevice=0x011a iManufacturer="SanDisk" iProduct="Cruzer Switch" iSerialNumber="123456789012" Unfortunately this doesn't seem to have made any difference and it is still rejected by the target devices. As far as I can tell the above parameters are getting passed through correctly $ ls /sys/module/g_mass_storage/parameters/* /sys/module/g_mass_storage/parameters/bcdDevice /sys/module/g_mass_storage/parameters/cdrom /sys/module/g_mass_storage/parameters/file /sys/module/g_mass_storage/parameters/idProduct /sys/module/g_mass_storage/parameters/idVendor /sys/module/g_mass_storage/parameters/iManufacturer /sys/module/g_mass_storage/parameters/iProduct /sys/module/g_mass_storage/parameters/iSerialNumber /sys/module/g_mass_storage/parameters/luns /sys/module/g_mass_storage/parameters/nofua /sys/module/g_mass_storage/parameters/removable /sys/module/g_mass_storage/parameters/ro /sys/module/g_mass_storage/parameters/stall $ cat /sys/module/g_mass_storage/parameters/* 282 /home/pi/piusb.bin 21874 1921 SanDisk Cruzer_Switch 123456789012 0 Y N However when connecting to Windows, here's what the USB mass storage displays - it appears that the iSerialNumber is making it through, but nothing else is being altered. My router shows similar issues, identifying it as "File-Stor Gadget (Rev: 0404)" USBSTOR\DISK&VEN_LINUX&PROD_FILE-STOR_GADGET&REV_0404\123456789012&0 USBSTOR\DiskLinux___File-Stor_Gadget0404 USBSTOR\DiskLinux___File-Stor_Gadget USBSTOR\DiskLinux___ USBSTOR\Linux___File-Stor_Gadget0 Linux___File-Stor_Gadget0 USBSTOR\GenDisk GenDisk By comparison, here's what SanDisk shows: USBSTOR\DISK&VEN_SANDISK&PROD_CRUZER_SWITCH&REV_1.26\4C532015741508522393&0 USBSTOR\DiskSanDisk_Cruzer_Switch___1.26 USBSTOR\DiskSanDisk_Cruzer_Switch___ USBSTOR\DiskSanDisk_ USBSTOR\SanDisk_Cruzer_Switch___1 SanDisk_Cruzer_Switch___1 USBSTOR\GenDisk GenDisk Any thoughts/suggestions as to how I can get the g_mass_storage module to replicate the above SanDisk information & thus work with these more picky devices? Thanks in advance Alan -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
