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Re: [Qemu-devel] [Qemu-arm] more serial ports on arm?

From: Peter Maydell
Subject: Re: [Qemu-devel] [Qemu-arm] more serial ports on arm?
Date: Mon, 10 Dec 2018 11:09:44 +0000

On Mon, 10 Dec 2018 at 11:00, Philippe Mathieu-Daudé <address@hidden> 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 <address@hidden> 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...

-- PMM

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