Re: Raspberry Pi 3B: /dev/mem mmap GPIO works on earmv7hf but not onaarch64

> On Feb 18, 2026, at 4:43=E2=80=AFPM, Yuri Honegger =
<[email protected]> wrote:
>=20
> Driving a 8-bit bus at 2MHz will be hard with any abstraction between
> your software and the GPIOs, even with a GPIOACCESS32 (unless
> you only need to write new values at a much much lower rate than 2MHz)

For an AY-3-8910, the 2MHz is about supplying the clock for the PSG=E2=80=99=
s internal counters.  The bus interface is asynchronous with respect to =
the clock, and register updates do not beed to be made that frequently.

I assume the desire to use the GPCLK0 output is all about avoiding have =
to use a separate crystal.

-- thorpej