Raspberry Pi Zero

[Warner Losh]

On Sun, Dec 6, 2015 at 3:02 AM, Jukka Ukkonen <jau789 at gmail.com> wrote:

> On 12/06/15 09:21, Stefan Parvu wrote:
> >
> >> I haven’t looked, but most likely a new u-boot and/or other firmware is
> required.
> >
> > Talking about this, reminds me something I always wanted to ask.
> >
> > Q: cant we deliver one image for RBPI, RBPI2, RBPI0 boards for example ?
> > Currently one has to download & use a different image for a different
> > board. Linux Raspbian does not have this model.
> >
> > Why is this on FreeBSD ARM ?
> >
> > thanks,
> >
>
> I guess there is also the little issue that because
> RPI2 supports hardware floating point operations,
>

Both support hardware floating point. RPi B vfp v2, and
the RPi2 vfp v3.


> it also makes sense to compile the user space with
> the hardware floating enabled. So, in addition to
> separate kernels one might quite reasonably wish to
> have also separate user space libraries and binaries.
>

It's desirable, but not for the floating point reason.


> Additionally RPI2 needs SMP support RPI-B does not.
> If the same common image had to support both, the
> image would end up being suboptimal for both.


The suboptimality isn't so great.

After I sent the mail last night, I realized that there's
other differences between the two CPUs that require different
DTBs, different firmware to be loaded into the GPU, and
likely a host of other minor things. Surmountable (since the
base firmware / IPL supports it), but lots of work.

Warner