[PATCH] Allwinner: fix booting on a number of devices

[Andre Przywara]

On Wed, 27 Aug 2025 08:50:14 +0100
Peter Robinson <pbrobinson at gmail.com> wrote:

Hi Peter,

thanks for the report!

> Revert "sunxi: enable MMU_PGPROT proper page table protection"
> 
> This reverts commit 16cfccda4dbf0b53473b8212897f5c63bfbeb6e1.
> 
> This causes the follow issue on the A64 boards I have including
> Pine64+, Pine64-LTS and the Pinephone. Revert until the issue
> can be properly investigated.
> 
> CPU:   Allwinner A64 (SUN50I)
> Model: Pine64+
> DRAM:  2 GiB
> Insufficient RAM for page table: 0x5000 > 0x4000. Please increase the size in get_page_table_size()

Mmh, how did you get this? I just ran mainline on a Pine64-LTS, and
didn't see any issues. Are you running on some specific setup? I am on
GCC 11.2.0, TF-A is some v2.12.0-724-gf745e004a, and that's with
pine64-lts_defconfig.

> resetting ...
> System reset not supported on this platform
> 
> Signed-off-by: Peter Robinson <pbrobinson at gmail.com>
> ---
>  arch/arm/Kconfig | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 40368abc297..b8be270e4d7 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1207,7 +1207,6 @@ config ARCH_SUNXI
>  	select DM_SPI_FLASH if SPI && MTD
>  	select DM_KEYBOARD
>  	select DM_SERIAL
> -	select MMU_PGPROT if ARM64

Regardless that's quite a sledgehammer. If that's a real issue, we
could surely provide our own get_page_table_size() implementation which
is more generous?

Cheers,
Andre

>  	select OF_BOARD_SETUP
>  	select OF_CONTROL
>  	select PINCTRL