Possible bug in ibmcpc driver

[Phileas Fogg <phileas-fogg%mail.ru@localhost>]

Hi,

i'm trying to boot NetBSD HEAD on my PowerMac G5 in bridge mode
and stumbled upon an odd isuue. The kernel panics in
extent_alloc_region with the message

extent_alloc_region: extent `%s' (0x0 - 0x0)
extent_alloc_region: start 0x%fa500000, end 0x%00100000
extent_alloc_region: region lies outside extent

I tried to debug this issue and found out
that bus tags sc_iot and sc_memt are not zeroed out
after each call ofwoea_map_space in ibmcpc_attach.
Adding bzero before ofwoea_map_space solved the issue but
the kernel paniced now in memio_map at line 601
with the message

"bus_space_map failed: ENOMEM"

Killing the if statement solved the issued then finally.
And PCI enumeration and mapping works on G5 now.

Regards