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>

README

@@ -2669,6 +2669,9 @@ FIT uImage format:
 		CONFIG_SPL_SPI_SUPPORT
 		Support for drivers/spi/libspi.o in SPL binary
 
+		CONFIG_SPL_RAM_DEVICE
+		Support for running image already present in ram, in SPL binary
+
 		CONFIG_SPL_LIBGENERIC_SUPPORT
 		Support for lib/libgeneric.o in SPL binary
 

common/spl/spl.c

@@ -128,6 +128,23 @@ static void __noreturn jump_to_image_no_args(void)
 	image_entry((u32 *)boot_params_ptr_addr);
 }
 
+#ifdef CONFIG_SPL_RAM_DEVICE
+static void spl_ram_load_image(void)
+{
+	const struct image_header *header;
+
+	/*
+	 * Get the header.  It will point to an address defined by handoff
+	 * which will tell where the image located inside the flash. For
+	 * now, it will temporary fixed to address pointed by U-Boot.
+	 */
+	header = (struct image_header *)
+		(CONFIG_SYS_TEXT_BASE -	sizeof(struct image_header));
+
+	spl_parse_image_header(header);
+}
+#endif
+
 void board_init_r(gd_t *dummy1, ulong dummy2)
 {
 	u32 boot_device;
@@ -145,6 +162,11 @@ void board_init_r(gd_t *dummy1, ulong dummy2)
 	boot_device = spl_boot_device();
 	debug("boot device - %d\n", boot_device);
 	switch (boot_device) {
+#ifdef CONFIG_SPL_RAM_DEVICE
+	case BOOT_DEVICE_RAM:
+		spl_ram_load_image();
+		break;
+#endif
 #ifdef CONFIG_SPL_MMC_SUPPORT
 	case BOOT_DEVICE_MMC1:
 	case BOOT_DEVICE_MMC2:

doc/README.SPL

@@ -66,6 +66,7 @@ CONFIG_SPL_DMA_SUPPORT (drivers/dma/libdma.o)
 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