On 11/08/15 17:14, Callum Aitchison wrote:
I posted on the forum about this issue and was directed here as a better place
My question is about usbfs (AKA usbdevfs) emulation within Linux compatibility
- it doesn’t get created in the Linuxulator but some binary Linux software
(Altera Quartus) I’m using requires it instead of libusb.
The system is documented here:
I have tried unmounting linprocfs and creating my own /compat/linux/proc
directory with bus/usb/devices copied from a Linux machine for the USB device
listed and then the device location in bus/usb/002/007 symlinked to the FreeBSD
USB device in /dev/ugen0.2. This, unsurprisingly, didn’t work since the Linux
nodes are obviously different from the FreeBSD nodes. Worth a try.
When I tried that dmesg printed the errors:
linux: pid 4640 (jtagd): ioctl fd=6, cmd=0x550f ('U',15) is not implemented
linux: pid 4640 (jtagd): ioctl fd=6, cmd=0x5510 ('U',16) is not implemented
Looking these up in the Linux headers in linux/usbdevice_fs.h I found:
#define USBDEVFS_CLAIMINTERFACE _IOR('U', 15, unsigned int)
#define USBDEVFS_RELEASEINTERFACE _IOR('U', 16, unsigned int)
Obviously the software was trying to claim and then release the USB interface
but the ioctl must differ between FreeBSD and Linux so it doesn’t work, makes
Unfortunately I don’t understand the FreeBSD or Linux USB systems enough to
work out a solution myself but I hope that there is either a pre-existing
solution or a solution that could be worked out.
I thought perhaps a translation layer between the Linux /proc/bus/usb/ and
FreeBSD /dev/ugen* but have no idea where to start implementing that myself.
Hopefully it can be sorted, it’d be nice to have all the USB stuff working in
Linux emulation, especially to be able to do my FPGA development entirely in
The FreeBSD's /dev/ugenX.Y don't support Linux's USBFS. It might be you
can build Linux's USBFS support into /usr/ports/multimedia/webcamd,
which already emulate the Linux USB stack in user-space.
Latest version of webcamd from SVN:
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