[linux-dvb] Problems with SMP (i.e. dualcore) system: dvb-ttpci: warning: timeout waiting in LoadBitmap

Sven Mueller linux-dvb at incase.de
Tue Jul 31 20:42:07 CEST 2007


Hi.

I'm running my vdr on an up-to-date (with respects to BIOS) ASUS
mainboard P5VD2-X with an Intel Pentium DualCore E2160 (a 65Watts
dualcore at 1800MHz). Kernel version is 2.6.18-4 (from Debian/ctvdr6).
The system has two IDE disks (with DMA enabled of course) and both a
budget (Nova-S) and a full featured (Nexus-S, rev. 1.5 IIRC) DVB-S PCI card.

If I boot 2.6.18-4-486 (which is a non-SMP kernel so only one core is
used), my vdr works perfectly nice. However, when I boot 2.6.18-4-686 or
any other SMP kernel (self-built or not, with Debian/ctvdr patches or a
stock kernel up to version 2.6.22, I tried everything apart from diving
into the code myself), I get the error message quoted in the subject
line (in syslog):

kernel: dvb-ttpci: warning: timeout waiting in LoadBitmap: 0, 1

And vdr seems to retry loading the Bitmap (as further messages of the
kind appear until I kill vdr and remove+reload the DVB kernel modules).
The error isn't 100% reproducible but usually occures when I try to open
vdr's on-screen menu. Once the first message of that kind occures, vdr
isn't responsible to keyboard/LIRC inputs anymore.

Any ideas how to fix this problem? I would really love to be able to use
both cores of my CPU and still have a working vdr.

"lspci -v" output for the DVB-S cards:

04:04.0 Multimedia controller: Philips Semiconductors SAA7146 (rev 01)
        Subsystem: Technotrend Systemtechnik GmbH
                   Siemens/Technotrend/Hauppauge DVB card
                   rev1.3 or rev1.5
        Flags: bus master, medium devsel, latency 32, IRQ 50
        Memory at dfeff000 (32-bit, non-prefetchable) [size=512]

04:06.0 Multimedia controller: Philips Semiconductors SAA7146 (rev 01)
        Subsystem: Technotrend Systemtechnik GmbH
                   Technotrend-Budget/Hauppauge WinTV-NOVA-S DVB card
        Flags: bus master, medium devsel, latency 32, IRQ 233
        Memory at dfefe000 (32-bit, non-prefetchable) [size=512]

"/proc/interrupts|grep -E 'dvb|saa'" says:
 50: 1288508186   IO-APIC-level  saa7146 (1)
233:   42658103   IO-APIC-level  saa7146 (0)


I don't know which hardware interrupts those are mapped from/to and
currently don't know how to find out.

If you need any further data to give a helpful answer, don't hesitate to
ask.

Regards,
Sven



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