Tyan Tomcat IIID Dual Pentium 166mmx Double Fault on Boot

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Folks,

I've been trying to bring up NetBSD (both 9.x and 10.x) on my vintage Tyan
Tomcat IIID (https://theretroweb.com/motherboards/s/tyan-s1563d-tomcat-iii).
Either via floppy boot or CD boot, the initial bootloader comes up and
loads the kernel, and then after the screen clears, I see this:

[  1.0000000] fatal double fault in supervisor mode
[  1.0000000] trap type 13 code 0xc011451d eip 0x8 cs 0x202 eflags 0x10 cr2
0 i
level 0 esp 0x30
[  1.0000000] cur lwp 0xc1285600 pid 0 lid 1 lowest kstack @xc15602c0
kernel: user trap double fault, code=0 Stopped in pid 0.1 (system) at 8:
invalid address

Does this likely have to do with the oddity of a dual Pentium system? It's
an Intel 430HX chipset with 56MB of RAM. RAM seems OK, and I have parity
enabled, and other OSes seem to boot and run OK, including use of a bunch
of RAM.

Thanks!
- Alex

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<div dir=3D"ltr"><div>Folks,</div><div><br></div><div>I&#39;ve been trying =
to bring up NetBSD (both 9.x and 10.x) on my vintage Tyan Tomcat IIID (<a h=
ref=3D"https://theretroweb.com/motherboards/s/tyan-s1563d-tomcat-iii">https=
://theretroweb.com/motherboards/s/tyan-s1563d-tomcat-iii</a>). Either via f=
loppy boot or CD boot, the initial bootloader comes up and loads the kernel=
, and then after the screen clears, I see this:</div><div><br></div><div>[=
=C2=A0 1.0000000] fatal double fault in supervisor mode</div>[=C2=A0 1.0000=
000] trap type 13 code 0xc011451d eip 0x8 cs 0x202 eflags 0x10 cr2 0 i<br>l=
evel 0 esp 0x30<br>[=C2=A0 1.0000000] cur lwp 0xc1285600 pid 0 lid 1 lowest=
 kstack @xc15602c0<br>kernel: user trap double fault, code=3D0 Stopped in p=
id 0.1 (system) at 8:<br><div>invalid address</div><div><br></div><div>Does=
 this likely have to do with the oddity of a dual Pentium system? It&#39;s =
an Intel 430HX chipset with 56MB of RAM. RAM seems OK, and I have parity en=
abled, and other OSes seem to boot and run OK, including use of a bunch of =
RAM.</div><div><br></div><div>Thanks!<br></div><div>- Alex</div></div>

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