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The R40 is the same as the A20 for all intents and purposes of
uart0-helloworld.

Add R40's SOC ID.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

Besides having fewer lines of code, the #define macros should
also prevent users from accidentally using these names without
braces (i.e. as function pointers). Instead, this will cause
compiler errors now.

soc_info.c: add "A10s" label in comment for SoC ID 0x1625.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Reviewed-by: Bernhard Nortmann <bernhard.nortmann@web.de>

This is a universal bootable image, which just prints a hello
message on UART0. For example, it is useful as a test payload
when debugging the SPI boot functionality:
   https://linux-sunxi.org/Bootable_SPI_flash

Changes in v2:
 - A workaround for https://patchwork.ozlabs.org/patch/622173
 - Also print the type of the used bootable media

Changes in v3:
 - Bernhard Nortmann's workaround for
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63803

More details in https://github.com/linux-sunxi/sunxi-tools/pull/44

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>