no loopback interface on custom kernel config.

[Dominik Zaczkowski <dominik%damned.com.pl@localhost>]

Hi,
I recently updated source tree to netbsd-4-0 branch and after
recompiling my custom kernel I have only rtk0 interface under ifconfig
-a while i should have also lo0 and pppoe0. When trying to create I
get:

#ifconfig lo0 create
ifconfig: SIOCIFCREATE: Invalid argument

I cant remember if i did any changes to my kernel config so im asking
here, did my config lacks something? 

Also without lo0 kernel panic's when using ping utility.

TIA. Dominik.

#
include         "arch/i386/conf/std.i386"
makeoptions     COPTS="-Os -march=athlon-xp -pipe"
makeoptions     DEBUG="-g"
maxusers        32
options         I686_CPU
options         INSECURE
options         MULTIBOOT
options         KTRACE
#options        SYSTRACE
options         SYSVMSG
options         SYSVSEM
options         SYSVSHM
#options        COMPAT_16
#options        COMPAT_20
options         COMPAT_30
options         COMPAT_43
options         COMPAT_386BSD_MBRPART
options         COMPAT_BSDPTY
options         USER_LDT
options         LKM
#options                COMPAT_LINUX
options         DDB
options         DDB_FROMCONSOLE=0
options         DDB_ONPANIC=0
#options                KVM86
#options                VESAFB_WIDTH=1024
#options                VESAFB_HEIGHT=768
#options                VESAFB_DEPTH=16

#systemy plikow
file-system     FFS
file-system     LFS
options         SOFTDEP
file-system     TMPFS
file-system     CD9660
file-system     KERNFS
file-system     NULLFS
file-system     MSDOSFS
file-system     NTFS
options         FFS_NO_SNAPSHOT
options         VNODE_OP_NOINLIN

#sieci
options         INET
#options        NFSSERVER

#
config          netbsd  root on ? type ffs
options         WSEMUL_VT100
options         WS_KERNEL_FG=WSCOL_GREEN
options         WSDISPLAY_COMPAT_PCVT
options         WSDISPLAY_COMPAT_USL
options         WSDISPLAY_COMPAT_RAWKBD

#urzadzenia
mainbus0        at root
cpu0            at mainbus0
apm0            at mainbus0
pci*            at mainbus? bus ?
#pchb*          at pci? dev ? function ?
pcib*           at pci? dev ? function ?
isa0            at pcib?
isa0            at mainbus?
#isapnp0                at isa?
npx0            at isa? port 0xf0 irq 13
pckbc0          at isa?
pckbd*          at pckbc?
#pms*           at pckbc?
vga0            at isa?
#pcdisplay0     at isa? 
wsdisplay*      at vga? console ?
#wsdisplay*     at pcdisplay? console ? 
#vesabios*      at vesabiosbus?
#vesafb*                at vesabios?
#wsdisplay*     at vesafb? console ?
wskbd*          at pckbd? console ?
#wsmouse*       at pms? mux 0
wsmouse*        at ums? mux 0
com0            at isa? port 0x3f8 irq 4
com1            at isa? port 0x2f8 irq 3
com2            at isa? port 0x3e8 irq 5
lpt0            at isa? port 0x378 irq 7
viaide*         at pci? dev ? function ?
atabus*         at ata?
wd*             at atabus? drive ? flags 0x0000
atapibus*       at atapi?
cd*             at atapibus? drive ?
rtk*            at pci? dev ? function ?
#pc speaker
pcppi*          at isa?
spkr0           at pcppi?
#usb
uhci*           at pci? 
ohci*           at pci?
usb*            at uhci?
usb*            at ohci?
uhub*           at usb?
uhub*           at uhub? port ? configuration ? interface ?
uhidev*         at uhub? port ? configuration ? interface ?
ums*            at uhidev? reportid ?
ulpt*           at uhub?
#----pendrivy,mp3ki etc...
umass*          at uhub?        
atapibus*       at umass?
scsibus*        at umass? channel ?
wd*             at umass?
sd*             at scsibus? target ? lun ?
sd*             at atapibus? drive ? flags 0x0000


# muzyka
#audio*         at audiobus?
#eap*           at pci? dev ? function ?
#sb*            at isapnp?
auvia*          at pci? dev ? function ?
audio*          at auvia?

#options                COMPAT_OSSAUDIO

#pseudo-urzadzenia
#pseudo-device  fss             4
pseudo-device   vnd             4
pseudo-device   bpfilter        8
pseudo-device   loop
pseudo-device   pty
pseudo-device   rnd
pseudo-device   clockctl
pseudo-device   wsmux
pseudo-device   wsfont
pseudo-device   ppp             2
pseudo-device   pppoe
pseudo-device   ipfilter
pseudo-device   pf
#options        IPFILTER_DEFAULT_BLOCK
options         IPFILTER_LOG

#altq
options         ALTQ
options         ALTQ_CBQ
options         ALTQ_HFSC
options         ALTQ_PRIQ
options         ALTQ_RED