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Re: Teensy 4.1 Implementation

From: Peter Maydell
Subject: Re: Teensy 4.1 Implementation
Date: Tue, 16 Aug 2022 11:05:40 +0100

On Tue, 16 Aug 2022 at 10:59, Alex Bennée <alex.bennee@linaro.org> wrote:
> Shiny Saana <shinysaana@gmail.com> writes:
> > I personally don't need any of the GPIO interfaces, but if needed
> > by someone else, that could be a good second step to
> > work on once that part of the board is implemented.
> Handling GPIOs in QEMU is fine (we have things like the qdev_init_gpio_*
> functions to handle them). The problem is usually what to do with the
> actual general purpose pins which aren't wired to something we emulate
> in the board. Some boards expose their values via QMP properties but I
> suspect whats really needed is a generic mechanism for exposing GPIO to
> external scripts rather than have every board define it's own thing.

Yes. However one key thing for trying to get a new board model
in is not to get tangled up in trying to improve/extend
the core QEMU facilities for something. That's much harder
than "my board model supports GPIO output lines to the same
extent as the other existing board models" :-)

-- PMM

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