> with verbose mode I get 
> isa0 is at root 
> immediatly after the installing busra line

Hmm, so maybe it is hanging in isa_attach() ?

    
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/i86pc/io/isa.c#201

To verify this, boot with options " -kdvs" and in kmdb
set a breakpoint in isa_attach, and start the kernel:

    ::bp isa`isa_attach
    ::cont

This should stop in kmdb before isa_attach() runs.

    ::step out

Now it should stop once more in kmdb, after 
isa_attach() has returned.  Does it stop in kmdb
after the "::step out" command, or does it hang?


In case it hangs in isa_attach:  the code tries to
use ACPI to enumerate isa devices.  Apparently
you can use option "-B acpi-enum=off" to disable
acpi for isa device enumeration.

The acpi isa bus enumeration code also contains
a debug switch to enable debug output, try to 
boot with "-B acpi_enum_debug=0xffff" to enable
all debug output.
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