Re: Testing versatile kernel on Raspberry Pi?
On Mon, 2016-01-25 at 14:56 +0000, Ben Hutchings wrote:
> On Mon, 2016-01-25 at 15:46 +0100, Diederik de Haas wrote:
> > Thanks for your response :-)
> >
> > On Monday 25 January 2016 13:23:20 Ian Campbell wrote:
> > > > I have a Raspberry Pi 1B, 1B+ and 2B and I'd love to test Debian's
> > > > 4.4
> > > > kernel for it. At least it is/was my understanding that the
> > > > versatile
> > > > kernel is meant for the Raspberry Pi.
> > >
> > > The versatile kernel is meant for ARM "veratile" development boards,
> > > and it
> > > also happens to be a reasonable platform emulated by QEMU.
> > >
> > > It's not "versatile" in the sense of "adaptable".
> >
> > I know. A slightly adapted version of the versatile kernel is used to
> > do Pi
> > simulation in QEMU and I've (also) created a repo for it:
> > https://github.com/diederikdehaas/raspbian-kernel (default branch is
> > kernel-3.18.x-qemu).
> >
> > If you look at the changelog on linux (4.4~rc8-1~exp1) [1] you see the
> > Raspberry Pi 2 explicitly mentioned and also references to BCM2836 (=Pi
> > 2),
> > BCM2835 (=Pi 1) and vc4 which stands for VideoCore4 which is the
> > graphics chip
> > for both the Pi 1 and 2.
> > Further reports on /. and phoronix [2] suggested that (full?) support
> > for the
> > Pi 1 and 2 was added to the upstream kernel and the changelog hinted at
> > that
> > as well. (A more recent report on /. [3] indicates that kernel 4.5 is
> > more
> > likely and it could be that it is primarily for the Pi 2.)
> [...]
>
> The armmp kernel flavour should now support the BCM2836 and the Pi 2,
I missed this going in, thanks!
> but *not* the BCM2835. Also, Debian's armhf port is built for ARMv7
> whereas the BCM2835 implements ARMv6. Most of the peripherals are the
> same between these two chips, so the driver names include 'bcm2835'.
>
> I haven't yet had confirmation that it actually does work.
Ian.
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