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From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= <philmd@redhat.com>
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Date: Mon, 10 Dec 2018 12:12:47 +0100
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Subject: Re: [Qemu-devel] [Qemu-arm] more serial ports on arm?
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>, qemu-arm <qemu-arm@nongnu.org>, QEMU Developers <qemu-devel@nongnu.org>

On 12/10/18 12:09 PM, Peter Maydell wrote:
> On Mon, 10 Dec 2018 at 11:00, Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>>
>> Hi Jason,
>>
>> On 12/7/18 5:42 AM, Jason A. Donenfeld wrote:
>>> On Tue, Nov 20, 2018 at 11:08 AM Peter Maydell <peter.maydell@linaro.org> wrote:
>>>> It's still stuck, because unconditionally adding a second serial
>>>> port to the virt board breaks some commonly used existing guest
>>>> code (UEFI + Linux), and it's not clear to me what the best
>>>> command line UI is for allowing the user to request the second
>>>> serial port.
>>>
>>> Can the UI be the same more or less as for x86? Specify a second
>>> -serial, and then the machine gets one added? If it's in secure mode,
>>> then it's added as serial 3 instead of 2, to remain backwards
>>> compatible.
>>
>> You can use various -serial arguments.
>>
>> If a board supports 4 serials and you only want to see the 3rd (secure
>> mode as your example) you could use:
>>
>> ./qemu -serial null -serial null -serial stdio
> 
> That's the opposite of Jason's issue, which is that the 'virt'
> board only supports 1 serial port but he would like 2...

Oh sorry Jason, I misunderstood your question.

Regards,

Phil.