[PATCH] Revert "riscv: Add a Zalrsc-only alternative for synchronization in start.S"

[Leo Liang]

On Thu, Sep 25, 2025 at 04:01:48PM +0000, Yao Zi wrote:
> [EXTERNAL MAIL]
> 
> This reverts commit a681cfecb4346107212f377e2075f6eb1bdc6a2b.
> 
> It has been reported that the commit causes boot regression for SPL on
> StarFive VisionFive 2 or compatible boards. Inspecting the code, I did
> spot one logic error for deciding whether Zaamo or Zalrsc is used, and
> it's still unclear what exactly causes the regression, let's revert it
> for now.
> 
> Reported-by: E Shattow <e at freeshell.de>
> Link: https://lore.kernel.org/u-boot/1871663e-b918-4351-9e9e-97f9a4c73733@freeshell.de/
> Signed-off-by: Yao Zi <ziyao at disroot.org>
> ---
> 
> The original series causing the problem[1] contains 3 patches, and I
> think it should be enough to revert the change of start.S only, since
> the others touch no code, and should be relatively safe. I'll fix the
> reverted change up and get it work on VisionFive 2 when I got my new
> board. Sorry for the inconvenience.
> 
> [1]: https://lore.kernel.org/u-boot/20250902081932.21103-1-ziyao@disroot.org/
> 
>  arch/riscv/cpu/start.S | 26 +-------------------------
>  1 file changed, 1 insertion(+), 25 deletions(-)

Acked-by: Leo Yu-Chi Liang <ycliang at andestech.com>