From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Thu, 2 Oct 2014 17:38:04 +0200 Subject: [PATCH 0/3] ARM: Meson6: enable SMP In-Reply-To: <3274534.jCjlMt5HJV@wuerfel> References: <1412066635-5298-1-git-send-email-carlo@caione.org> <3418275.THTV4FmaIz@wuerfel> <20141002145426.GE4039@lukather> <3274534.jCjlMt5HJV@wuerfel> Message-ID: <20141002153804.GF4039@lukather> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Oct 02, 2014 at 05:26:53PM +0200, Arnd Bergmann wrote: > On Thursday 02 October 2014 16:54:26 Maxime Ripard wrote: > > On Thu, Oct 02, 2014 at 04:44:20PM +0200, Arnd Bergmann wrote: > > > On Tuesday 30 September 2014 22:45:38 Carlo Caione wrote: > > > > On mar, set 30, 2014 at 12:22:21 +0200, Arnd Bergmann wrote: > > > > > On Tuesday 30 September 2014 10:46:46 Carlo Caione wrote: > > > > > > On mar, set 30, 2014 at 10:43:52 +0200, Carlo Caione wrote: > > > > > > > Amlogic Meson6 is a dual-core Cortex-A9. This patchset adds all the necessary > > > > > > > pieces to boot the secondary CPU. > > > > > > > > > > > > Sorry for the double sending. > > > > > > Forgot to CC LAKML. > > > > > > > > > > Looks good to me in principle, but I wonder about the CPU enable method. > > > > > Are you able to implement PSCI in u-boot like it was done for allwinner? > > > > > > > > > > This is mostly a question of whether the system comes up in secure mode > > > > > or non-secure mode. > > > > > > > > I would be able if I had the u-boot source code or the possibility to > > > > flash the board I'm using. Unfortunately at this moment I don't have > > > > either. Probably in the near future I'll be able to implement PSCI in > > > > u-boot since Amlogic is kindly starting to provide documentation but now > > > > this is the best I can do. > > > > > > Ok, I see. Let's give Amlogic some more time then. I think it's better > > > to merge other parts of the platform first when we can reasonably assume > > > that we don't have to change the binding any more. > > > > > > It would be a shame to merge this now and then make it obsolete by > > > implementing PSCI but still having to carry around the original code > > > for compatibility reasons. > > > > More likely, PSCI is not going to be supported by the bootloaders of > > the devices already in the wild, so we still have to provide them an > > option. And even when it will, you'll still have to support both the > > devices with the old bootloaders, and the one with the new. > > It depends on how common the old boot loaders are, and whether it's > possible to upgrade them. If we can get to the point where you can > boot a kernel with a single CPU and have an easy way to update the > boot loader, we don't need to support it. I thought I heard Olof at some point ranting about this kind of requirements, but ok :) Still, holding off until something that hypothetical happens looks a bit odd, doesn't it? Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: