[Bug 196501] [em] Intel 82573 nic built on my pdsbm-ln2 1U server and only one port will work.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196501

John Baldwin <jhb at FreeBSD.org> changed:

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                 CC|                            |jhb at FreeBSD.org

--- Comment #5 from John Baldwin <jhb at FreeBSD.org> ---
Try setting 'hint.agp.0.disabled=1' in loader.conf.  agp0 allocates a page of
address space that causes a trickle down effect where em0 and em1 have to
allocate different BARs.

That said, em0/1 should be able to cope with the alternate BARs, though it may
be that em0 doesn't work because em1's bridge is still decoding those addresses
when em0 tries to probe.  I bet that if we forced em0 to reattach it would
actually work ok (e.g using my devctl thing that isn't in the tree yet).

Ultimately this is a PCI bus bug, not an em(4) issue.

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