[PATCH] Documentation/arm64: clarify requirements for DTB placement

[Will Deacon]

On Wed, Sep 04, 2013 at 03:10:02PM +0100, Mark Salter wrote:
> The current description of DTB placement requirements does not quite
> match the kernel code in head.S: __vet_fdt and __create_page_tables.
> This patch tweaks the text to match the actual requirements placed on
> it by the code.
> 
> Signed-off-by: Mark Salter <msalter at redhat.com>
> ---
>  Documentation/arm64/booting.txt | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
> index 5273c4d..98df4a0 100644
> --- a/Documentation/arm64/booting.txt
> +++ b/Documentation/arm64/booting.txt
> @@ -45,9 +45,9 @@ sees fit.)
>  
>  Requirement: MANDATORY
>  
> -The device tree blob (dtb) must be no bigger than 2 megabytes in size
> -and placed at a 2-megabyte boundary within the first 512 megabytes from
> -the start of the kernel image. This is to allow the kernel to map the
> +The device tree blob (dtb) must be placed on an 8-byte boundary within
> +the first 512 megabytes from the start of the kernel image and must not
> +cross a 2-megabyte boundary. This is to allow the kernel to map the
>  blob using a single section mapping in the initial page tables.

Yes, that's a better way of wording the requirements. Thanks!

  Acked-by: Will Deacon <will.deacon at arm.com>

Will