SPL: Add support for loading image from ram in SPL.

Signed-off-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/doc/README.SPL b/doc/README.SPL
index 5368586..4e1cb28 100644
--- a/doc/README.SPL
+++ b/doc/README.SPL
@@ -66,6 +66,7 @@
 CONFIG_SPL_POST_MEM_SUPPORT (post/drivers/memory.o)
 CONFIG_SPL_NAND_LOAD (drivers/mtd/nand/nand_spl_load.o)
 CONFIG_SPL_SPI_LOAD (drivers/mtd/spi/spi_spl_load.o)
+CONFIG_SPL_RAM_DEVICE (common/spl/spl.c)
 
 
 Normally CPU is assumed to be the same between the SPL and normal