alpm(4) I/O range is claimed by ACPI

[Bruce M Simpson]

Jeremy Chadwick wrote:
> ...
> Might mention this to jhb@ to see if it's related to the SMBus changes
> made 1.5 years ago:
> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/pci/alpm.c
>   

Thanks for the pointers. The other reports sound like duplicate reports 
of the same issue.

I'm not sure that backing out the last change is going to help. The BIOS 
has generally set up the I/O resource before FreeBSD boots; the 
bus_set_resource() call might only be useful in those cases where that 
hasn't happened.
In any event, in alpm_attach(), the rman is going to notice that the bus 
space is already allocated by acpi(4), and will balk.

I'm sure there has been some kind of override mechanism in place for 
certain other drivers; but they seem to boil down to using an ACPI 
attachment of some kind, which won't work here as alpm(4) is a PCI 
function and needs to attach to the pcib parent.

It would be really, really useful to have working SMBus drivers right 
now on a machine I can actually touch...

cheers
BMS