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-------------------------------------------------------------------------
-A3M071 board support
-------------------------------------------------------------------------
-
-
-SPL NOR flash support:
-----------------------
-To boot fast into the OS (Linux), this board port integrates the SPL
-framework. This means, that a special, stripped-down version of
-U-Boot runs in the beginning. In the case of the A3M071 board, this
-SPL U-Boot version is less than 16 KiB big. This SPL U-Boot can either
-boot the OS (Linux) or a "real", full-blown U-Boot. This detection
-on whether to boot Linux or U-Boot is done by using the "boot_os"
-environment variable. If "boot_os" is set to "yes", Linux will be
-loaded and booted from the SPL U-Boot version. Otherwise, the
-full-blown U-Boot version will be loaded and run.
-
-Enabling Linux booting:
------------------------
-From U-Boot:
-=> setenv boot_os yes
-=> saveenv
-
-From Linux:
-$ fw_setenv boot_os yes
-
-Enabling U-Boot booting:
-------------------------
-From U-Boot:
-=> setenv boot_os no
-=> saveenv
-
-From Linux:
-$ fw_setenv boot_os no
-
-
-Preparing Linux image(s) for booting from SPL U-Boot:
------------------------------------------------------
-To boot the Linux kernel from the SPL, the DT blob (fdt) needs to get
-prepard/patched first. U-Boot usually inserts some dynamic values into
-the DT binary (blob), e.g. autodetected memory size, MAC addresses,
-clocks speeds etc. To generate this patched DT blob, you can use
-the following command:
-
-1. Load fdt blob to SDRAM:
-=> tftp 1800000 a3m071/a3m071.dtb
-
-2. Set bootargs as desired for Linux booting (e.g. flash_mtd):
-=> run mtdargs addip2 addtty
-
-3. Use "fdt" commands to patch the DT blob:
-=> fdt addr 1800000
-=> fdt boardsetup
-=> fdt chosen
-
-4. Display patched DT blob (optional):
-=> fdt print
-
-5. Save fdt to NOR flash:
-=> erase fc180000 fc07ffff
-=> cp.b 1800000 fc180000 10000
-
-All this can be integrated into an environment command:
-=> setenv upd_fdt 'tftp 1800000 a3m071/a3m071.dtb;run mtdargs addip addtty; \
-	fdt addr 1800000;fdt boardsetup;fdt chosen;erase fc180000 fc07ffff; \
-	cp.b 1800000 fc180000 10000'
-=> saveenv
-
-After this, only "run upd_fdt" needs to get called to load, patch
-and save the DT blob into NOR flash.
-
-Additionally, the Linux kernel image has to be saved uncompressed in
-its uImage file (and not gzip compressed). This can be done with this
-command:
-
-$ mkimage -A ppc -O linux -T kernel -C none -a 0 -e 0 \
-	-n "Linux Kernel Image" -d vmlinux.bin uImage.uncompressed
-
-------------------------------------------------------------------------
-Stefan Roese, 2012-08-23