I don't know if we can attach two ISA bus at once.
Did you already try that?

vrisab0	at vrgiu? platform SIEMENS_MOBIC_T8 isaportoffset 0x0
isa0	at vrisab0
sm0	at isa0 port 0x300 irq 0x0001000a

vrisab1 at vrgiu? platform SIEMENS_MOBIC_T8 isaportoffset 0x1000000
isa1	at vrisab1
pcic0	at isa1 port 0x3e0 iomem 0x70000 iosiz 0x4000 irq 0x000d0003

TAKEMURA

From: Markus Hennecke <markus.hennecke@fh-swf.de>
Subject: New device for hpcmips
Date: Fri, 9 Jan 2004 17:37:47 +0100 (CET)

> Hi,
> 
> porting netbsd to a new device got me running into some problems. Some
> information about the device can be found at
> http://www.ad.siemens.de/mobic/index_76.htm
> 
> The cpu is a vr4121. There are two companion chips (vrc4171 and vrc4172)
> and a 100Mbit ethernet controller (SMC90C100FD). Now to the problem: If
> I set the isaportoffset to 0x1000000 the pcmcia controller (io-base
> 0x15000000) is recognized and usable. The ethernet controller (io-base
> at 0x14000000) can be accessed with an isaportoffset of 0x0. But if I
> use that setting the pcmcia controller won't work. Is there an easy way
> to make the two devices work together?
> 
> dmesgs can be found
> http://stud-in.fh-swf.de/Markus.Hennecke/mobic/dmesg-network and
> http://stud-in.fh-swf.de/Markus.Hennecke/mobic/dmesg-pcmcia
> the config file is at
> http://stud-in.fh-swf.de/Markus.Hennecke/mobic/MOBIC
> 
> Greetings
>   Markus