SPL: Add NOR flash booting support

SPL NOR flash booting support is quite simple. Only copying of the
images is needed.

On MPC5xxx we need to make sure to only use the standard memcpy()
implementation and not the MPC5xxx specific one. As the MPC5xxx
version has some complexity which is not needed for this SPL
booting.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>

common/spl/Makefile

@@ -15,6 +15,7 @@ LIB	= $(obj)libspl.o
 
 ifdef CONFIG_SPL_BUILD
 COBJS-$(CONFIG_SPL_FRAMEWORK) += spl.o
+COBJS-$(CONFIG_SPL_NOR_SUPPORT) += spl_nor.o
 COBJS-$(CONFIG_SPL_YMODEM_SUPPORT) += spl_ymodem.o
 COBJS-$(CONFIG_SPL_NAND_SUPPORT) += spl_nand.o
 endif

common/spl/spl.c

@@ -142,6 +142,11 @@ void board_init_r(gd_t *dummy1, ulong dummy2)
 		spl_nand_load_image();
 		break;
 #endif
+#ifdef CONFIG_SPL_NOR_SUPPORT
+	case BOOT_DEVICE_NOR:
+		spl_nor_load_image();
+		break;
+#endif
 #ifdef CONFIG_SPL_YMODEM_SUPPORT
 	case BOOT_DEVICE_UART:
 		spl_ymodem_load_image();

common/spl/spl_nor.c

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2012 Stefan Roese <sr@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <spl.h>
+
+void spl_nor_load_image(void)
+{
+	/*
+	 * Loading of the payload to SDRAM is done with skipping of
+	 * the mkimage header in this SPL NOR driver
+	 */
+	spl_image.flags |= SPL_COPY_PAYLOAD_ONLY;
+
+	if (spl_start_uboot()) {
+		/*
+		 * Load real U-Boot from its location in NOR flash to its
+		 * defined location in SDRAM
+		 */
+		spl_parse_image_header(
+			(const struct image_header *)CONFIG_SYS_UBOOT_BASE);
+
+		memcpy((void *)spl_image.load_addr,
+		       (void *)(CONFIG_SYS_UBOOT_BASE +
+				sizeof(struct image_header)),
+		       spl_image.size);
+	} else {
+		/*
+		 * Load Linux from its location in NOR flash to its defined
+		 * location in SDRAM
+		 */
+		spl_parse_image_header(
+			(const struct image_header *)CONFIG_SYS_OS_BASE);
+
+		memcpy((void *)spl_image.load_addr,
+		       (void *)(CONFIG_SYS_OS_BASE +
+				sizeof(struct image_header)),
+		       spl_image.size);
+
+		/*
+		 * Copy DT blob (fdt) to SDRAM. Passing pointer to flash
+		 * doesn't work (16 KiB should be enough for DT)
+		 */
+		memcpy((void *)CONFIG_SYS_SPL_ARGS_ADDR,
+		       (void *)(CONFIG_SYS_FDT_BASE),
+		       (16 << 10));
+	}
+}

include/spl.h

@@ -56,6 +56,9 @@ void spl_display_print(void);
 /* NAND SPL functions */
 void spl_nand_load_image(void);
 
+/* NOR SPL functions */
+void spl_nor_load_image(void);
+
 /* MMC SPL functions */
 void spl_mmc_load_image(void);