hdsp cardbus coldboot bug workaround

hdsp cardbus coldboot bug workaround

[Thomas Charbonnel]

Hi,

It has already been reported on this list that the hdsp cardbus card is
not detected correctly at boot time after a cold boot. When this happens
here's what dmesg says about it:
cs: cb_alloc(bus 3): vendor 0xffff, device 0xffff
PCI: device 03:00.0 has unknown header type 7f, ignoring.

This problem is reproducible every time for if those conditions are met:
* non acpi-enabled kernel
* boot on AC power

A workaround seems thus to build acpi into the kernel. My guess is that
when acpi is not enabled, the card is asked its id parameters before its
full initialization, or full initialization of the cardbus-to-pci bridge.
Things working on battery power could be explained by the fact that in
this case the CPU frequency (at least on my laptop) is scaled down by the
bios at boot time, leading to a slower boot process.

Thomas





-------------------------------------------------------
This SF.Net email sponsored by: Free pre-built ASP.NET sites including
Data Reports, E-commerce, Portals, and Forums are available now.
Download today and enter to win an XBOX or Visual Studio .NET.
http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01

Re: hdsp cardbus coldboot bug workaround

[Jesse Chappell]

Thomas Charbonnel wrote on Sat, 02-Aug-2003:

 > It has already been reported on this list that the hdsp cardbus card is
 > not detected correctly at boot time after a cold boot. When this happens
 > here's what dmesg says about it:
 > cs: cb_alloc(bus 3): vendor 0xffff, device 0xffff
 > PCI: device 03:00.0 has unknown header type 7f, ignoring.
 > 
 > This problem is reproducible every time for if those conditions are met:
 > * non acpi-enabled kernel
 > * boot on AC power

I have never had the cold boot problem and I use the conditions
you mention above.  My hardware is an IBM ThinkPad A31, with a
rev 0xb HDSP cardbus, acpi *not* enabled (not compiled in and
a noacpi kernel cmdline), with AC power.

Hmmm, your solution might help people that do have the problem,
though.

jlc


-------------------------------------------------------
This SF.Net email sponsored by: Free pre-built ASP.NET sites including
Data Reports, E-commerce, Portals, and Forums are available now.
Download today and enter to win an XBOX or Visual Studio .NET.
http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01

Re: hdsp cardbus coldboot bug workaround

[Thomas Charbonnel]

> I have never had the cold boot problem and I use the conditions
> you mention above.  My hardware is an IBM ThinkPad A31, with a
> rev 0xb HDSP cardbus, acpi *not* enabled (not compiled in and
> a noacpi kernel cmdline), with AC power.
>
> Hmmm, your solution might help people that do have the problem,
> though.
>
> jlc
>
>

Thanks for the report. I use 0xa, so that can be a clue, plus my
cardbus-to-pci bridge is only supported by linux since kernels > 2.4.19.

Thomas





-------------------------------------------------------
This SF.Net email sponsored by: Free pre-built ASP.NET sites including
Data Reports, E-commerce, Portals, and Forums are available now.
Download today and enter to win an XBOX or Visual Studio .NET.
http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01