In a freshly cvsup'ed current, I get a panic at boot, if both ports are
enabled in userconfig.
If only one or the other is enabled, it works.

I have narrowed it down to it panics the second time ppbconf calls
bus_generic_probe:

trap 12: page fault while in kernel mode

bus_generic_probe+0x25: cmpl $0xc02a502c,0(%ebx)
ebx is 0xe0

My config is:
machine         i386
cpu             I586_CPU
ident           ARNOLD
maxusers        32
makeoptions     DEBUG=-g                #Build kernel with gdb(1) debug symbols
options         INET                    #InterNETworking
options         INET6
options         FFS                     #Berkeley Fast Filesystem
options         FFS_ROOT                #FFS usable as root device [keep this!]
options         NFS                     #Network Filesystem
options         MSDOSFS                 #MSDOS Filesystem
options         CD9660                  #ISO 9660 Filesystem
options         PROCFS                  #Process filesystem
options         COMPAT_43               #Compatible with BSD 4.3 [KEEP THIS!]
options         SCSI_DELAY=5000         #Be pessimistic about Joe SCSI device
options         UCONSOLE                #Allow users to grab the console
options         USERCONFIG              #boot -c editor
options         VISUAL_USERCONFIG       #visual boot -c editor
options         DDB
device          isa
device          eisa
device          pci
options         COMPAT_OLDPCI           # Old PCI driver shims
device          ncr0
device          scbus0
device          da0     #Only need one of these, the code dynamically grows
device          pass0
device          cd0
device          atkbdc0 at isa? port IO_KBD
device          atkbd0  at atkbdc? irq 1
device          psm0    at atkbdc? irq 12
device          vga0    at isa? port ?
pseudo-device   splash
device          sc0     at isa?
device          npx0    at nexus? port IO_NPX irq 13
device          apm0    at nexus? disable flags 0x31 # Advanced Power Management
device          sio0    at isa? port IO_COM1 flags 0x10 irq 4
device          sio1    at isa? port IO_COM2 irq 3
device          ppc0    at isa? 
device          ppbus
device          lpt     
device          ppi     
device          ppc1    at isa?  irq 5
device ed0 at isa? port 0x340 irq 10 iomem 0xd8000
pseudo-device   loop
pseudo-device   speaker
pseudo-device   ether
pseudo-device   sl      1
pseudo-device   ppp     1
pseudo-device   tun     2
pseudo-device   pty     16
pseudo-device   gzip            # Exec gzipped a.out's
options         KTRACE          #kernel tracing
options         SYSVSHM
options         SYSVMSG
options         SYSVSEM
pseudo-device   bpf 4   #Berkeley packet filter
device pca0 at isa? port IO_TIMER1
options         SOFTUPDATES
pseudo-device   sppp
pseudo-device   "i4bq921"
pseudo-device   "i4bq931"
pseudo-device   "i4b"
pseudo-device   "i4btrc"        2
pseudo-device   "i4bctl"
pseudo-device   "i4brbch"       4
pseudo-device   "i4btel"        2
pseudo-device   "i4bipr"        4
options         IPR_VJ
pseudo-device   "i4bisppp"      4
options DRN_NGO
device isic0




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