Sounds like the USB driver doesn't support a particular transfer type or
feature.
Have you checked this.
Nic
--- In Andrew Taylor <> wrote:
>
> This is to vent my frustration with USB on ts7800. I'm trying
> to deploy systems with Maxon BP3 3g usb wireless modems (sierra
> wireless chipset). These work on ts7200 & x86 fine. But don't work
> connected to a ts7800 with 2.6.21-ts(oct102008) +airprime or with
> 2.6.30-rc7(http://ts78xx.digriz.org.uk/)+option. The option module failes
> immediately giving messages like this: "option: option_instat_callback:
> error -71" which apparently indicates a low-level USB problem. I've tried
> multiple ts7800 boards and multiple USB modems.
>
> Fortunately if a (non-powered) USB hub is interposed the modem seems to
> work reliably. But the extra power consumption of the hub is annoying
> because my systems are solar-powered.
>
> More frustrating is audio. I capture sound using custom-built usb sound
> boards based on AVRs and previously using Griffin iMics. Again these work
> with ts7200 (same EABI kernel & userland) & x86 but fail with ts7800s
> running both 2.6.21-ts and 2.6.30-rc7. As far I can tell the problem
> is not ALSA, it seems to be a low level hardware/software bug in the
> ts7800's USB. If a (non-powered) USB hub is interposed, sound capture
> sometimes works but it depends on the hub, the sampling rate and other
> configuration details. I can't make it reliable enough for my purposes.
> I don't need sound playback - but it also seem to have problems.
>
> I haven't seen any problems with USB storage devices on the ts7800 but I
> don't use them much. The above problems occur if you power the devices
> separately or via the ts7800.
>
> So the moral is, don't count on non-storage USB devices working on
> a ts7800. In particular USB audio is likely to fail. And interposing
> a hub might help. As consequence I'm looking for alternative low power
> boards with SATA+USB 2.0. This one looks interesting:
> http://www.logicpd.com/sites/default/files/1013568A_OMAP-L138_eXperimenter_Brief.pdf
> More suggestions welcome.
>
> Andrew
>
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