[U-Boot] [U-Boot, v3] armv8/vexpress64: make multientry conditional

[Tom Rini]

On Tue, Feb 17, 2015 at 11:34:59AM +0100, Linus Walleij wrote:

> While the Freescale ARMv8 board LS2085A will enter U-Boot both
> on a master and a secondary (slave) CPU, this is not the common
> behaviour on ARMv8 platforms. The norm is that U-Boot is entered
> from the master CPU only, while the other CPUs are kept in
> WFI (wait for interrupt) state.
> 
> The code determining which CPU we are running on is using the
> MPIDR register, but the definition of that register varies with
> platform to some extent, and handling multi-cluster platforms
> (such as the Juno) will become cumbersome. It is better to only
> enable the multiple entry code on machines that actually need
> it and disable it by default.
> 
> Make the single entry default and add a special
> ARMV8_MULTIENTRY KConfig option to be used by the
> platforms that need multientry and set it for the LS2085A.
> Delete all use of the CPU_RELEASE_ADDR from the Vexpress64
> boards as it is just totally unused and misleading, and
> make it conditional in the generic start.S code.
> 
> This makes the Juno platform start U-Boot properly.
> 
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>

At least with master today not all platforms compile as at least
ls2085a_emu fails not being able to call smp_kick_all_cpus

-- 
Tom
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