[U-Boot] [U-Boot, v2] arm64: add better and more generic spin-table support

[Tom Rini]

On Mon, Jun 27, 2016 at 07:31:05PM +0900, Masahiro Yamada wrote:

> There are two enable methods supported by ARM64 Linux; psci and
> spin-table.  The latter is simpler and helpful for quick SoC bring
> up.  My main motivation for this patch is to improve the spin-table
> support, which allows us to boot an ARMv8 system without the ARM
> Trusted Firmware.
> 
> Currently, we have multi-entry code in arch/arm/cpu/armv8/start.S
> and the spin-table is supported in a really ad-hoc way, and I see
> some problems:
> 
>   - We must hard-code CPU_RELEASE_ADDR so that it matches the
>     "cpu-release-addr" property in the DT that comes from the
>     kernel tree.
> 
>   - The Documentation/arm64/booting.txt in Linux requires that
>     the release address must be zero-initialized, but it is not
>     cared by the common code in U-Boot.  We must do it in a board
>     function.
> 
>   - There is no systematic way to protect the spin-table code from
>     the kernel.  We are supposed to do it in a board specific manner,
>     but it is difficult to predict where the spin-table code will be
>     located after the relocation.  So, it also makes difficult to
>     hard-code /memreserve/ in the DT of the kernel.
> 
> So, here is a patch to solve those problems; the DT is run-time
> modified to reserve the spin-table code (+ cpu-release-addr).
> Also, the "cpu-release-addr" property is set to an appropriate
> address after the relocation, which means we no longer need the
> hard-coded CPU_RELEASE_ADDR.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>

Applied to u-boot/master, thanks!

-- 
Tom
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