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Allwinner H6 SoC has a totally different memory map and different clock
control unit with other SoCs.

Add support for it in uart0-helloworld-sdboot.

To avoid writing blindly into the device MMIO area first (for triggering
the SRAM version register), we query the known content of some GIC register
to verify we are looking at an H6 memory map.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Andre Przywara <osp@andrep.de>

Allwinner A80 and H6 SoC has totally different memory map with other
Allwinner SoCs, and so the GPIO/UART0 base addresses are different on
these SoCs.

Use a static variable to store the base address, to fit these SoCs with
different memory map.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Andre Przywara <osp@andrep.de>

Also includes an updated uart0-helloworld-sdboot.sunxi binary.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

With fixed SID reading routine, it's now possible to differ H2+ with H3
with SID.

Tested on an Orange Pi One and an Orange Pi Zero.
Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>

Add the SoC ID and UART0 pinmux for V3s.
Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>

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>