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    SubjectRe: floppy in 2.1.99

    On Sat, 2 May 1998, Charles Shannon Hendrix wrote:

    > My system dies booting 2.1.99 right after the floppy init message.
    > I thought that was fixed in 2.1.99?

    your system has one known MP-BIOS bug, the BIOS creates such IRQ MP-table
    entries on your board:

    I/O Ints: Type Polarity Trigger Bus ID IRQ
    INT active-hi level 1 6

    such 'active-hi+level' IRQs are illegal, the only allowed combinations are
    these:

    INT active-hi edge 1 1 [ISA IRQ]
    INT active-lo level 0 7:D [PCI IRQ]

    io-apic-patch-2.1.97-A (attached) works this around (without affecting
    working boards), but it's not included in 2.1.99 yet. Yes it generates
    some nasty flood of bootup messages, but the problem is nasty too ...

    [i think this is the only known outstanding problem with your system, can
    you confirm that this fixes the floppy hang?]

    -- mingo

    --- linux/arch/i386/kernel/io_apic.c.orig Sat Apr 25 04:30:53 1998
    +++ linux/arch/i386/kernel/io_apic.c Sat Apr 25 04:46:18 1998
    @@ -361,6 +361,21 @@
    }
    }

    + /*
    + * There are broken mptables which register ISA+high-active+level IRQs,
    + * these are illegal and are converted here to ISA+high-active+edge
    + * IRQ sources. Careful, ISA+low-active+level is another broken entry
    + * type, it represents PCI IRQs 'embedded into an ISA bus', they have
    + * to be accepted. Yes, ugh.
    + */
    + if ( (mp_bus_id_to_type[bus] == MP_BUS_ISA) &&
    + (entry.polarity == 0) /* active-high */ &&
    + (entry.trigger == 1) /* level */ )
    + {
    + printk("broken BIOS, changing pin %d to edge\n", i);
    + entry.trigger = 0;
    + }
    +
    io_apic_write(0x10+2*i, *(((int *)&entry)+0));
    io_apic_write(0x11+2*i, *(((int *)&entry)+1));
    }


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