Re: ata1.00: failed to IDENTIFY (I/O error, err_mask=0x4)

[Alan Cox]

O> I don't see the connection between (no-)smp and ata. Something with
> interrupt routing/IPI, missing irq ack? Booting another !SMP kernel
> works fine. The problem also exists in 2.6.24-rc2.

Almost certainly interrupt routing try smp but with noapic and see if it
fails as well ?
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