On Tue, 14 Dec 2010, Sergej Pupykin wrote:
> At Tue, 14 Dec 2010 10:47:01 -0500 (EST),
> Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> > You should change your program to install configuration 0 (i.e.,
> > unconfigure the device) before carrying out the data transfer. That
> > will limit the transfer rate to one transaction per ms -- provided you
> > continue to use a UHCI controller.
>
> Thanks, I'll try it. But it is strange:
> - If I run Windows application in VirtualBox on Linux it stops working.
> - If I run Linux application in VirtualBox on Windows it starts
> working.
>
> I supposed that problem source is near the host controller driver.
Yes, that's probably true.
I don't know if your program will work if it does Set-Config(0). The
device may not accept the DFU requests in that state.
If necessary, you can force all control transactions to be spaced at
millisecond intervals by editing drivers/usb/host/uhci-q.c in the Linux
source. At the end of uhci_submit_control(), remove the lines saying
if (urb->dev->speed == USB_SPEED_LOW ||
urb->dev->state != USB_STATE_CONFIGURED)
skel = SKEL_LS_CONTROL;
else {
skel = SKEL_FS_CONTROL;
uhci_add_fsbr(uhci, urb);
}
and replace them with the single line:
skel = SKEL_LS_CONTROL;
Alan Stern
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
