[PATCH v2 3/6] arm64: PIE: Allow fixed stack pointer

Tom Rini
2020-10-09T13:02:41Z

On Wed, Sep 30, 2020 at 05:39:15PM +0100, Andre Przywara wrote:

> Currently selecting CONFIG_POSITION_INDEPENDENT also forces us to use an
> initial stack pointer relative to the beginning of the BSS section.
> This makes some sense, because this should be writable memory anyway.
>
> However the BSS section is not cleared or used until later in the
> setup process (after relocation), so memory nearby might not be
> available early enough to host the initial stack. This is an issue if
> U-Boot is loaded from (Flash-)ROM, for instance.
>
> Allow CONFIG_INIT_SP_RELATIVE to be turned off by a board's config, to
> be able to select a fixed stack pointer, for instance in known good
> DRAM.
>
> This will help QEMU utilising PIE, when it's loaded to (Flash-)ROM.
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> Reviewed-by: Stephen Warren <swarren@nvidia.com>

Applied to u-boot/master, thanks!

--
Tom
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