On Tue, Feb 16, 2021 at 4:42 PM Howard Spoelstra <hsp.c...@gmail.com> wrote: > > On Tue, Feb 16, 2021 at 3:48 PM Gerd Hoffmann <kra...@redhat.com> wrote: > > > > Hi, > > > > > Please find another pcap file attached. This one stems from an attempt > > > to pass through a midi device when running qemu-system-ppc with Mac OS > > > 9.2 in macOS host. > > > > Ah, yes, I remember now. Problem is that the usb stick is plugged into > > a high-speed port (usb2) on the host but passed as full-speed device > > (usb1) to the guest. That works in some cases, but is not guaranteed > > to work. usb_host_speed_compat() tries to catch some of the > > incompatible cases. The usb-storage incompatibility slips through > > because the incompatibility is specific to the mass storage protocol. > > Specifically the wMaxPacketSize is 64 for usb1 and 512 for usb2. > > > > Seems fedora deals better with the situation ... > > > > take care, > > Gerd > > > > Hi Gerd, > > Thanks for looking into this. It looks to me that the usb storage > device nicely reports endpoints 1 and 2 when asked, but that the host > only ever communicates with endpoint 1. > Is that the issue you refer to, or might that be libusb related? > > Can this also explain that other (non-mass-storage) devices cannot be > passed through successfully ? > > Best, > Howard
Hi Gerd, Thanks for the explanation. I've been successful in passing through an USB 2.0 stick into Mac OS 9.x when connected to a real USB 1.1 hub in a old Apple keyboard. This at least gives some perspective to connect other devices as well. So we can consider this quest finished ;-) Best, Howard
