Hi, Paul Zimmerman <pauldzim@xxxxxxxxx> writes: >>>> > Did you try enabling verbose debugging in g_mass_storage? This >>>> > requires setting CONFIG_USB_GADGET_DEBUG and CONFIG_USB_GADGET_VERBOSE >>>> > in the kernel configuration and then rebuilding g_mass_storage.ko. >>>> > And at runtime you may need to enable dynamic debugging by doing >>>> > >>>> > echo 'module g_mass_storage =p' >/sys/kernel/dynamic_debug/control >>>> > >>>> > before plugging the device into anything. Then compare the contents of >>>> > the dmesg log for the different scenarios. In particular, look for >>>> > differences between plugging it into System 2 (say) right after boot >>>> > vs. after plugging it into System 1. >>>> >>>> OK interesting - I'll need to do some searching to understand how to >>>> change that and rebuild g_mass_storage.ko but I like the idea of >>>> seeing more detail about what is happening as the systems are closed >>>> so I'm unable to do any troubleshooting at that end. >>> >>> Do you have any experience in building a kernel for the Raspberry Pi? >>> The procedure is explained on several web sites, but you have to know >>> what you're doing. >> >> No I don't - I'll have a read over things to see what I can suss out. > > The 'Linux File-Stor Gadget' string is part of the SCSI inquiry data, and > is set by the fsg_common_set_inquiry_string() function in f_mass_storage.c. > This must be what the problematic host systems are reacting to, and not any > of the USB info that you have overridden. It looks like there is a way to > override this string using configfs, perhaps Alan will know how to do this. There should be a file named "inquiry_string" on mass storage's function directory: # find /c/usb_gadget/storage/functions/mass_storage.1/ /c/usb_gadget/storage/functions/mass_storage.1/ /c/usb_gadget/storage/functions/mass_storage.1/lun.0 /c/usb_gadget/storage/functions/mass_storage.1/lun.0/inquiry_string /c/usb_gadget/storage/functions/mass_storage.1/lun.0/nofua /c/usb_gadget/storage/functions/mass_storage.1/lun.0/cdrom /c/usb_gadget/storage/functions/mass_storage.1/lun.0/removable /c/usb_gadget/storage/functions/mass_storage.1/lun.0/ro /c/usb_gadget/storage/functions/mass_storage.1/lun.0/file /c/usb_gadget/storage/functions/mass_storage.1/stall Just write your string to it: # echo "My Inquiry String" > /c/usb_gadget/storage/functions/mass_storage.1/lun.0/inquiry_string -- balbi
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