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SubjectRe: [PATCH] 8250: option 'force_polling' for buggy IRQs
> Serial consoles are already polled for output.  So nothing should
> care until userspace starts, and the full serial driver initializes.

At which point it hangs

> So I suspect either "irqfixup" or "irqpoll" would handle this for you.
> If not I am certain a small tweak to some of that code would work.

irqfixup won't usually help but irqpoll with HZ=1000 ought to, although
it has its own set of problems because not all devices with non shared
IRQ lines take kindly to irqpoll.

Alan

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