[Bug 277211] panic: Unhandled external data abort - handle_el1h_sync - --- exception, esr 0x96000410 - wait_fw_init - mlx5_load_one

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277211

--- Comment #8 from John Baldwin <jhb@FreeBSD.org> ---
Created attachment 248936
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=248936&action=edit
fix.patch

Please try this patch.  Looking at the dmesg, the address was translated
incorrectly.  It matches this range which requires no translation:

pcib0: PCI addr: 0x10100000000, CPU addr: 0x10100000000, Size: 0x7f00000000,
Type: memory

(PCI addr == CPU addr), but it was matching on the wrong range and translating
the address as if it belonged to the first range:

pcib0: PCI addr: 0x0, CPU addr: 0x10010000000, Size: 0x10000, Type: I/O port

The code I changed in commit d79b6b8ec267 expected the end to be >= start, and
the end value of 0 in the old code violated this assumption.

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