> A better way would be to add device number restrictions to config.
> Something that would allow us to say "com0 can only be at isa? port
> 0x3f8 irq 4 or at pnpbios"

Isn't that what you get with

com0 at isa? port 0x3f8 irq 4
com0 at pnpbios?

(possibly with locators on the last line, I don't know pbpbios)?

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