Title: Re: OS X IOKit equivalent for
IRP_MN_QUERY_RESOURCE_REQUIR
Hi Jason, thanks for the info:
At 2:12 PM -0700 5/11/07, Jason Seng wrote:
PCI devices are probed and resources
assigned at boot time, i.e. before the OS loads.
Doh! That's what I was afraid of...
In my case, the
hardware on our PCI device says it needs a 128 MB
memory window
(which is what shows up in the IO registry for
IODeviceMemory for
the device). However, for the way we are using
the device, we
don't actually need to use that entire memory window,
so we'd like to
tell the OS that we only *really* need, say, 32
MB.
For Open Firmware you could provide an
FCode driver that can override the address space size requested by a
BAR.
Apparently similar functionality is not
available in EFI. :(
Double-doh!
Without changing
the hardware, if possible. :)
Well, your hardware should request what
it actually needs ;)
Yeah, I know... it's one of those legacy hardware situations.
But at least on the bright side it's now officially not my problem.
:) I'll go back to the hardware guys and see what we can
do.
My Windows
counterparts are making fun of me because they can do
this
in
Windows...
<sigh>
It's OK, IOKit provides plenty of opportunities to hassling in
the other direction!
Thanks,
Jim
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Darwin-drivers mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/darwin-drivers/email@hidden
This email sent to email@hidden
