On Wed, 17-Dec-2008 at 00:04:30 +0100, Andre Albsmeier wrote:
> Hello all,
>
> I am writing a driver which attaches to the Host-PCI bridge. When
> compiled into the kernel or loaded by the loader everything works
> and the driver gets attached. This is due to the fact that I return
> BUS_PROBE_SPECIFIC in my probe routine which gains over the -10000
> returned by pci_hostb_probe() in i386/pci/pci_bus.c.
>
> However, when I want to load my driver via kldload this fails since
> the hostb device has already been attached during kernel load (when
> my driver was not present):
>
> hos...@pci0:0:0: class=0x060000 card=0x11d510cf chip=0x35808086 rev=0x02
> hdr=0x00
>
> What can I do to make my driver load via kldload?
> Is there a way to detach the hostb0 from the Host-PCI bridge?
Found the answer myself but will post it here in case anyone
got a similar problem one day: I added the device detach method
for the hostb driver to sys/i386/pci/pci_bus.c:
--- sys/i386/pci/pci_bus.c.ORI 2007-08-17 08:12:33.000000000 +0200
+++ sys/i386/pci/pci_bus.c 2008-12-23 13:34:35.000000000 +0100
@@ -619,10 +619,13 @@
return 0;
}
+static int pci_hostb_detach(device_t dev) { return 0; }
+
static device_method_t pci_hostb_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pci_hostb_probe),
DEVMETHOD(device_attach, pci_hostb_attach),
+ DEVMETHOD(device_detach, pci_hostb_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
Now, when kldload'ing my driver, it can walk through all devices
and detach hostb using device_detach().
-Andre
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