Sergij Kolisnyk wrote:
>
> ----- Original Message -----
> From: "Roman Weissgaerber" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, May 09, 2001 4:54 PM
> Subject: Re: [linux-usb-devel] EILSEQ - FAQ ??
>
> > Sergij Kolisnyk wrote:
> > >
> > > Hi!
> > >
> > > All we know the problem.
> > >
> > > On _some_ motherboards when doing USB bulk read at full speed,
> > > URB completes with "-84" error code...
> > >
> >
> > -84 (EILSEQ) means CRC Error of the packet sent by the device.
>
> Or timeout...
>
No!!!! EILSEQ means just CRC Error, ETIMEDOUT means timeout.
See Programming Guide for Linux USB Device Drivers, Page 26
Section 3.1, Error Codes!!!
See also kernel 2.4.4 uhci.c line 786 or usb-uhci.c line 2160 or
USB_ST_CRC (just CRC) for ohci.c (mapping is in usb.h).
> > So I think this is a problem of the device and not of the HC.
>
> This is at least MB BIOS or VGA dependent!!!
> This is checked.
>
Or Power Supply or PCB Design ...
> Same HD. So the same Linux. Same 440BX. Different BIOS.
> Different VGA (both nVidia). One of them has X running, one not.
>
> The error occured only on one of them.
>
> >
>
> And problem is reported by many people trying to utilyze
> full throughput avaliable in USB 1.1.
>
Who has reported, Where has it been reported?
> Different devices are affected.
>
What devices do you use.
- Roman
> When one of device or driver slowes the throughput down,
> the error disappears.
>
> MacOS drivers don't see the error at same speeds.
>
> > - Roman
> >
> >
> > > That happens only when device is fast enough to really utilyze
> > > throughput of USB 1.1 full speed.
> > >
> > > IMHO, this error may depend on BIOS, VGA and having X running...
> > > Error isn't HCI-specific, it occurs on both OHCI and UHCI.
> > >
> > > FAQ: How to workaround this error?
> > > May be usb.c has to have URB-wrapper to suppress the error?
> > > Isn't Linux overuse USB frame duration?
> > >
> > > I haven't found the answer anywhere...
> > >
> > > Thank you,
> > > Sergij Kolisnyk
> > >
>
> _______________________________________________
> [EMAIL PROTECTED]
> To unsubscribe, use the last form field at:
> http://lists.sourceforge.net/lists/listinfo/linux-usb-devel
_______________________________________________
[EMAIL PROTECTED]
To unsubscribe, use the last form field at:
http://lists.sourceforge.net/lists/listinfo/linux-usb-devel
