[PATCH 04/11] vexpress64: fvp: enable OF_CONTROL

[Tom Rini]

On Fri, Mar 04, 2022 at 04:30:11PM +0000, Andre Przywara wrote:
> The FVP base model is relying on a DT for Linux operation, so there is
> no reason we would need to rely on hardcoded information for U-Boot.
> Letting U-Boot use a DT will open up the usage of actual peripherals,
> beyond the support for semihosting only.
> 
> Enable OF_CONTROL in the Kconfig, and use the latest dts files from
> Linux. Depending on whether we use the boot-wrapper or TF-A, there is
> already a DTB provided or not, respectively.
> 
> To cover the boot-wrapper, we add an arm64 Linux kernel header, which
> allows the boot-wrapper to treat U-Boot like a Linux kernel. U-Boot will
> find the pointer to the DTB in x0, and will use it.
> 
> Even though TF-A carries a DT, at the moment this is not made available
> to non-secure world, so to not break users, we use the U-Boot provided
> DTB copy in that case. For some reason TF-A puts some DT like structure
> at the address x0 is pointing at, but that is very small and doesn't
> carry any hardware information. Make the code to ignore those small DTBs.
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---
>  arch/arm/Kconfig                       | 2 ++
>  arch/arm/dts/Makefile                  | 1 +

>  board/armltd/vexpress64/Kconfig        | 8 ++++++--
>  board/armltd/vexpress64/vexpress64.c   | 8 +++++++-
>  configs/vexpress_aemv8a_semi_defconfig | 2 +-
>  5 files changed, 17 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 34dbd73cce..afb42e62d8 100644

Applied to u-boot/next, thanks!

-- 
Tom
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