sunxi: sunxi-common.h: Reduce bootm_size to take the framebuffer into account

Before video output support can be enabled on the A13-OLinuXinoM, bootm_size
must first be reduced to take into account that the framebuffer is shaved of
the top of the DRAM. For other boards this is not an issue since bootm was set
to 256M and all boards have at least 512M except for the A13-OLinuXinoM.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

include/configs/sunxi-common.h

@@ -272,10 +272,13 @@
 #ifndef CONFIG_SPL_BUILD
 #include <config_distro_defaults.h>
 
-/* 256M RAM (minimum), 32M uncompressed kernel, 16M compressed kernel, 1M fdt,
- * 1M script, 1M pxe and the ramdisk at the end */
+/*
+ * 240M RAM (256M minimum minus space for the framebuffer),
+ * 32M uncompressed kernel, 16M compressed kernel, 1M fdt,
+ * 1M script, 1M pxe and the ramdisk at the end.
+ */
 #define MEM_LAYOUT_ENV_SETTINGS \
-	"bootm_size=0x10000000\0" \
+	"bootm_size=0xf000000\0" \
 	"kernel_addr_r=0x42000000\0" \
 	"fdt_addr_r=0x43000000\0" \
 	"scriptaddr=0x43100000\0" \