[PATCH] raspberrypi: reserve first two pages in efi memory map

[Matthias Brugger]

On 26/02/2020 15:03, kevans at FreeBSD.org wrote:
> From: Kyle Evans <kevans at FreeBSD.org>
> 
> The psci stub provided by Raspberry Pi is around 5k in size, thus residing
> in the first two pages of memory. Without this reservation, the next stage
> or OS assume they're free to use the second page and may get catastrophic
> results from clobbering it.
> 
> Signed-off-by: Kyle Evans <kevans at FreeBSD.org>
> Cc: Matthias Brugger <mbrugger at suse.com>
> ---
>  board/raspberrypi/rpi/rpi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
> index e367ba3092..d3f9bd16ac 100644
> --- a/board/raspberrypi/rpi/rpi.c
> +++ b/board/raspberrypi/rpi/rpi.c
> @@ -488,8 +488,8 @@ int ft_board_setup(void *blob, bd_t *bd)
>  	lcd_dt_simplefb_add_node(blob);
>  
>  #ifdef CONFIG_EFI_LOADER
> -	/* Reserve the spin table */
> -	efi_add_memory_map(0, 1, EFI_RESERVED_MEMORY_TYPE, 0);
> +	/* Reserve the first two pages for spin table/psci stub. */
> +	efi_add_memory_map(0, 2, EFI_RESERVED_MEMORY_TYPE, 0);

Is this that changed recently or was the memory reservation wrong from the
beginning?

Reagrds,
Matthias

>  #endif
>  
>  	return 0;
>