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Re: [Qemu-trivial] [Qemu-devel] [Qemu-arm] [PATCH] hw/arm/virt: support

From: Peter Maydell
Subject: Re: [Qemu-trivial] [Qemu-devel] [Qemu-arm] [PATCH] hw/arm/virt: support 4 serial ports
Date: Sun, 10 Dec 2017 18:15:14 +0000

On 8 December 2017 at 18:39, Jason A. Donenfeld <address@hidden> wrote:
> On Fri, Dec 8, 2017 at 12:49 PM, Peter Maydell <address@hidden> wrote:
>> My suggestion is that we should add a second non-secure UART
>> to the virt board, so if you're using secure=no then you
>> get serial 1 and 2, and for secure=yes serial 1 is the first
>> NS uart, serial 2 is the secure uart and serial 3 is the
>> 2nd NS uart. (I don't really want to add a 4th uart unless
>> there's some good reason to -- maybe we would turn out to
>> want it for the secure side, for instance.)

> I'm curious why you don't want to add a 4th UART. It seems trivial to
> do, and the more the merrier? Or that's a silly attitude? Mostly just
> curious about that, as having two personally suits my needs.

As I say, if we add it for the non-secure world we can't
make it a secure uart later if that turns out to be what we need.
The "4 uarts max" limit is a compile time one.
(Also it uses physical address space in a region which is
relatively small and which we might want for a different device.)

-- PMM

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