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Cc: freebsd-acpi@freebsd.org, bug-followup@freebsd.org
Subject: Re: kern/121558: Supermicro X7SB4 Fatal trap 12 when ACPI disabled
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I've added

hw.pci0.13.0.INTA.irq="16"
hw.pci0.15.0.INTA.irq="17"
hw.pci0.5.0.INTA.irq="19"

and now it boots when ACPI disabled. I have also tried to move hints into 
/boot/loader.conf and this also works.

Now I have

hw.pci0.13.0.INTA.irq="40"
hw.pci0.15.0.INTA.irq="41"
hw.pci0.5.0.INTA.irq="43"

in /boot/loader.conf and I see the following lines in dmesg log:
em3: <Intel(R) PRO/1000 Network Connection Version - 6.7.3> port 0x5000-0x501f mem 0xd8400000-0xd841ffff irq 40 at device 0.0 on pci13
em4: <Intel(R) PRO/1000 Network Connection Version - 6.7.3> port 0x6000-0x601f mem 0xd8500000-0xd851ffff irq 41 at device 0.0 on pci15
em2: <Intel(R) PRO/1000 Network Connection Version - 6.7.3> port 0x4000-0x401f mem 0xd8320000-0xd833ffff,0xd8300000-0xd831ffff irq 43 at device 0.0 on pci5

that I plan to stick with.

I've replaced  src/sys/dev/usb/ehci_pci.c with revision 1.3 from trunk and 
now also reboot is handled well.

Thank you for all support and now I suggest to close the ticket.
We'll see if BIOS will be upgraded by Supermicro. For now, above workaround 
is the only cure for this and similar boards.

Kind regards,

Leon Kos, CAD lab, Mech.Eng., University of Ljubljana, Slovenia
(http://www.lecad.uni-lj.si/~leon)