JohnSwenson wrote: > I've spent all afternoon looking at this, what I can come up with is > that the USB ports on the Am3358 are EHCI compatible when used in host > mode. (hardware pins forcing host mode). There is a driver that works > for this (OMAP_ehci). The problem seems to be with the musb driver which > is the one specifically written to handle the OTG modes, which is what > the kernels use since they detect what it actually is. This may be wrong > since I haven't actually found anybody outright saying this, but from > reading between the lines this is what seems to be happening. If this is > true it might be possible to force the use of the ehci driver rather > than the musb driver. > > There have also been reports that these issues only occur with newer > kernels and that things were working with older kernels. > > The AM3715 was one of my top contenders, but it does not support DDR2 or > DDR3 memory, only LPDDR, which has a memory speed about half of what you > can get from DDR2. The memory chips are also quite a bit more expensive > and larger than regular DDR2 memory chips. > > I've ordered a BeagleBone, it should be here this coming week sometime > and I can actually play with it and actually see what happens with > different kernels and DACs.
Great - let us know where you get to. My only waryness with this is that we don't want to get into needing to look at linux usb drivers, so I would prefer to be using the ones commonly used and know to be working. The Pi uses something which appears not to have a hardware scheduler and relies on the interrupt driver to schedule packets - which leads to it missing packets in iso streams... The EHCI principle of having a hardware schedule is working well for us on other devices so is lowest risk... (Plus I spend too long instrumenting the EHCI scheduler to reach the conclusion of what Touch hardware would do :)) ------------------------------------------------------------------------ Triode's Profile: http://forums.slimdevices.com/member.php?userid=17 View this thread: http://forums.slimdevices.com/showthread.php?t=97881 _______________________________________________ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/discuss
