[PATCH 2/2] imx8mm_evk: Add Serial Download Protocol support

[sbabic at denx.de]

> Add Serial Download Protocol support as it is a useful method to
> load flash.bin to RAM and run it via 'uuu'.
> With this patch, it is possible to start both U-Boot SPL and U-Boot
> proper using the following 'uuu'command:
> $ uuu -brun spl flash.bin
> Based on a patch from Marek Vasut for the imx8mm-mx8menlo board.
> Also, to fit the SPL binary into the internal RAM, select CONFIG_LTO
> to reduce its size.
> Signed-off-by: Fabio Estevam <festevam at denx.de>
> Reviewed-by: Peng Fan <peng.fan at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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