[U-Boot] [PATCH v10 4/4] doc: sifive-fu540: Update README to explicitly load DTB for Linux

[Joe Hershberger]

On Mon, Jul 22, 2019 at 2:59 AM Anup Patel <Anup.Patel at wdc.com> wrote:
>
> We should explicitly load DTB from TFTP server or MMC/SD card
> for Linux booting. This will allow us:
> 1. To use different Linux DTB for SiFive Unleashed board with
>    expansion board connected.
> 2. Avoid re-flashing OpenSBI firmware whenever board connections
>    change.
>
> This patch updates reference bootlog in SiFive FU540 README
> as-per above.
>
> Signed-off-by: Anup Patel <anup.patel at wdc.com>

Reviewed-by: Joe Hershberger <joe.hershberger at ni.com>