# [OmniOS-discuss] overriding serial port IRQ

Paul B. Henson henson at acm.org
Sun Feb 2 01:46:07 UTC 2014

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    So I updated the BIOS on my storage box, which has a supermicro X9SRi-F,
    from 2.0a to 3.0a, and my IPMI SOL console stopped working :(. After an
    annoying investigation, I discovered that the new BIOS misconfigures
    ttyc/COM3, the BIOS says it's using irq 4, when in actuality it's using
    irq 10. Under linux, when I override the bios config and force the
    driver to use irq 10, it works fine.

    How do I get an illumos/omnios box to override the bios serial port
    config and use an explicitly configured irq rather than the BIOS
    provided one? It looks like I need to tweak something in
    /kernel/drv/asy.conf, but I'm not really clear on exactly what.

    Thanks for any pointers, and ay, supermicro, fix one thing and break
    another <sigh>...

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