From: Marcel Holtmann <marcel@holtmann.org>
To: Erwin Authried <eauth@softsys.co.at>
Cc: BlueZ Mailing List <bluez-users@lists.sourceforge.net>
Subject: Re: [Bluez-users] lockup problem with larger packets
Date: Thu, 28 Oct 2004 13:47:40 +0200 [thread overview]
Message-ID: <1098964060.6636.15.camel@pegasus> (raw)
In-Reply-To: <1098928778.23859.32.camel@kabel>
Hi Erwin,
> > > I have cross-compiled bluez for uClinux-2.4.20 for ARM7, with the bluez
> > > kernel patch applied, and bluez-utils 2.10. I'm using the Conceptronic
> > > CBT100C PCMCIA card on the system. The card is initialized with
> > > "hciattach ttyS2 bcsp". Basically, the system works fine, but I see
> > > occasional overrun errors on the UART, maybe because the ARM7 is running
> > > with 40MHz only. When I transmit larger packets (l2ping -s 300 ...), the
> > > number of overrun errors increases, and sometimes the system locks up.
> > > I'm getting an endless sequence of:
> > >
> > > bcsp_pkt_cull: Peer acked invalid packet
> > > bcsp_handle_le_pkt: Found a LE sync pkt, card has reset
> > > bcsp_pkt_cull: Peer acked invalid packet
> > > bcsp_handle_le_pkt: Found a LE sync pkt, card has reset
> > > bcsp_pkt_cull: Peer acked invalid packet
> > > ...
> >
> > I am not a BCSP or uClinux expert so I think that I can't help you here,
> > but from my testing with the BCSP part of the hci_uart driver I never
> > saw any problems like this.
> >
> After a lot of debugging, I found out that the serial irq routine calls
> tty_flip_buffer_push with the serial interrupt disabled. The processing
> of the input buffer in bcsp_recv (hci_bcsp.c) was too slow so that the
> characters that were buffered in the FIFO during that time caused an
> overrun (There is no RTS/CTS flowcontrol). I have done modifiations to
> hci_bcsp.c so that the processing is done much faster, and the problem
> seems to have gone.
please provide us a patch with your modifications.
Regards
Marcel
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next prev parent reply other threads:[~2004-10-28 11:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-22 21:21 [Bluez-users] lockup problem with larger packets Erwin Authried
2004-10-23 13:55 ` Marcel Holtmann
[not found] ` <1098928778.23859.32.camel@kabel>
2004-10-28 11:47 ` Marcel Holtmann [this message]
2004-10-28 14:31 ` Erwin Authried
2004-10-28 17:30 ` Marcel Holtmann
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