This patch adds an initial fdt support to the m68k architecture.
It has been tested on stmark2 board, with a devicetree and
CONFIG_DM_SERIAL=y + CONFIG_DM_SPI=y.
----- test log -----
U-Boot 2018.09-00137-g1be43784f1 (Sep 20 2018 - 22:34:42 +0200)
CPU: Freescale MCF54415 (Mask:a0 Version:2)
CPU CLK 240 MHz BUS CLK 120 MHz FLB CLK 60 MHz
INP CLK 30 MHz VCO CLK 480 MHz
SPI: ready
DRAM: 128 MiB
Loading Environment from SPI Flash... SF: Detected is25lp128 with page size 256
Bytes, erase size 64 KiB, total 16 MiB
*** Warning - bad CRC, using default environment
In: uart@fc060000
Out: uart@fc060000
Err: uart@fc060000
Hit any key to stop autoboot: 0
SF: Detected is25lp128 with page size 256 Bytes, erase size 64 KiB, total 16 MiB
device 0 offset 0x100000, size 0x700000
SF: 7340032 bytes @ 0x100000 Read: OK
## Booting kernel from Legacy Image at 40001000 ...
Image Name: mainline kernel
Created: 2018-09-14 19:06:13 UTC
Image Type: M68K Linux Kernel Image (uncompressed)
Data Size: 2184848 Bytes = 2.1 MiB
Load Address: 40001000
Entry Point: 40001000
Verifying Checksum ... OK
Loading Kernel Image ... OK
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