[U-Boot] [PATCH 00/10] sunxi: Add basic PSCI support to enable SMP on the A80's first cluster

[Rask Ingemann Lambertsen <rask@formelder.dk>]

On Wed, Jan 25, 2017 at 06:40:38PM +0800, Chen-Yu Tsai wrote:

[hacking around the broken A80 TrustZone implementation]
> This is doable, and it is actually what Allwinner's kernel does, but is
> really hackish. The released 3.4 kernel also has the same workarounds
> for A83T. So it's also possible the A83T has the same issues.

FWIW, the kernel that ships with my A80 based media player produces this:
[    0.000000] Linux version 3.4.39+ (lzq at sunchip-CS24-TY) (gcc version 4.6.3 20120201 (prerelease) (crosstool-NG linaro-1.13.1-2012.02-20120222 - Linaro GCC 2012.02) ) #1 SMP PREEMPT Sat Nov 14 03:33:12 UTC 2015
...
[    0.262230] CPU4: failed to boot: -22
[    0.302298] CPU5: failed to boot: -22
[    0.342350] CPU6: failed to boot: -22
[    0.382421] CPU7: failed to boot: -22

So I guess you are not alone in having trouble getting PSCI to work on the
A80. However, when trying out your patches, I also once or twice got a
failure booting CPU2 although CPU3 and CPU4 came up fine.

> So, if there's still interest in getting a working PSCI environment
> for the A80/A83T, I'll look into doing a workaround patch for GIC-400.
> Otherwise I'm going to go back and revive my MCPM patches for in-kernel
> SMP support.

I vote for whatever works. I'll also happily test it. Is there a git tree
I should keep an eye on?

-- 
Rask Ingemann Lambertsen