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From: Peter Maydell <peter.maydell@linaro.org>
Date: Thu, 31 May 2018 12:57:38 +0100
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Subject: Re: [Qemu-devel] [PATCH 2/3] hw/arm/virt: Add another UART to the
 virt board
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To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Andrew Jones <drjones@redhat.com>, qemu-arm <qemu-arm@nongnu.org>, QEMU Developers <qemu-devel@nongnu.org>, Shannon Zhao <shannon.zhao@linaro.org>

On 31 May 2018 at 12:48, Jason A. Donenfeld <Jason@zx2c4.com> wrote:
> On Thu, May 31, 2018 at 10:32 AM, Peter Maydell
> <peter.maydell@linaro.org> wrote:
>> It stalled on the fact that adding the second UART breaks
>> UEFI images (annoyingly, UEFI iterates through UARTs in
>> the DTB in the opposite direction to Linux, so if you add
>> a second UART then it picks that one to use rather than
>> the first one, IIRC). So it would have to be an awkward
>> thing with a new machine option to request the extra UART.
>
> Can you just add them in the opposite order for UEFI then?

No, because that would break Linux guests. We don't
know what guest software we're running (and indeed
UEFI typically proceeds to boot Linux).

thanks
-- PMM