Fail to boot on a 486DLC

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Hi all,

In my craze to run NetBSD on all sorts of hardware, I've been struggling for some time to make it run on Cyrix/TI 486DLC-type CPUs. Based on reading of data sheets and consulting with people far more qualified than myself, I feel like this *should* work, as the CPU supports all the instructions etc. that NetBSD needs these days. Sadly, it does not.

Symptoms:
Kernel loads from floppy (or HDD), loader prints "Start @ ....", and then the system just hangs.

What I've tried - hardware:
- Disable internal/external caches in BIOS
- Custom BIOS which sets 0-4GB cache exclusion range, in case the kernel re-enables the CR0 bit that enables the cache
- With/without FPU
- Different mainboards, different CPUs
- Cache and memory timing variations

What I've tried - software:
- Minimal kernel config (attached)
- Added some printfs to sys/arch/i386/stand/lib/exec.c
- Looked for places where the CR0:NE bit might be toggled (didn't find any in code that I seem to reach)

I've tested on a couple of IBM 486SLC machines; those are basically 386SX-class CPUs with a 486 core - 32-bit internal, 20-bit address, 16-bit data bus. They are similar to, but not the same as, the Cyrix/TI variants - and they run NetBSD 10.1 beautifully.

I've also tested in 86Box, and I happen to have exactly the same hardware as one of its emulation options: ECS Panda 386V motherboard and 486DLC CPU. In 86Box, it boots fine. It does not boot on any of my real hardware, and I've tested a *lot* of combinations.

Finally, to my questions:
What is the next piece of (C) code that gets run after startprog() in exec.c? I'd like to add more printfs there, to see how far it's getting. Also, any suggestions about where to look for the problem would be very welcome.

If I can get to the bottom of this, I'll soon reach my ultimate goal - a 286 machine running NetBSD (with a plug-in 486SXLC upgrade)!

Take care, all,
/Eirik
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