[PATCH] lib/utils: fdt: Update FDT expand size to 1024 for reserved memory node

[Atish Patra]

On Thu, Jun 25, 2020 at 2:36 AM Bin Meng <bmeng.cn at gmail.com> wrote:
>
> From: Bin Meng <bin.meng at windriver.com>
>
> Currently 256 bytes is used for the FDT expand size when fixing up
> reserved memory node. Increase it to 1024 bytes with an estimated
> size of 64 bytes per PMP memory region by 16 regions in total.
>
> Signed-off-by: Bin Meng <bin.meng at windriver.com>
> ---
>
>  lib/utils/fdt/fdt_fixup.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/lib/utils/fdt/fdt_fixup.c b/lib/utils/fdt/fdt_fixup.c
> index adf1be3..a3bccae 100644
> --- a/lib/utils/fdt/fdt_fixup.c
> +++ b/lib/utils/fdt/fdt_fixup.c
> @@ -151,8 +151,14 @@ int fdt_reserved_memory_fixup(void *fdt)
>         int na = fdt_address_cells(fdt, 0);
>         int ns = fdt_size_cells(fdt, 0);
>
> -       /* expand the device tree to accommodate new node */
> -       err  = fdt_open_into(fdt, fdt, fdt_totalsize(fdt) + 256);
> +       /*
> +        * Expand the device tree to accommodate new node
> +        * by the following estimated size:
> +        *
> +        * Each PMP memory region entry occupies 64 bytes.
> +        * With 16 PMP memory regions we need 64 * 16 = 1024 bytes.
> +        */
> +       err = fdt_open_into(fdt, fdt, fdt_totalsize(fdt) + 1024);
>         if (err < 0)
>                 return err;
>
> --
> 2.7.4
>
>
> --
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Reviewed-by: Atish Patra <atish.patra at wdc.com>

-- 
Regards,
Atish