omap-common: Add NAND SPL linux booting

This implements booting of Linux from NAND in SPL

Related config parameters:
CONFIG_SYS_NAND_SPL_KERNEL_OFFS
	Offset in NAND of direct boot kernel image to use in SPL
CONFIG_SYS_SPL_ARGS_ADDR
	Address where the kernel boot arguments are expected - this is
	normally RAM-start + 0x100 (on ARM)

Signed-off-by: Simon Schwarz <simonschwarzcor@gmail.com>
CC: Tom Rini <tom.rini@gmail.com>
CC: Stefano Babic <sbabic@denx.de>
CC: Wolfgang Denk <wd@denx.de>

arch/arm/cpu/armv7/omap-common/spl_nand.c

@@ -24,6 +24,7 @@
 #include <asm/u-boot.h>
 #include <asm/utils.h>
 #include <asm/arch/sys_proto.h>
+#include <asm/io.h>
 #include <nand.h>
 #include <version.h>
 #include <asm/omap_common.h>
@@ -32,6 +33,9 @@
 void spl_nand_load_image(void)
 {
 	struct image_header *header;
+	int *src __attribute__((unused));
+	int *dst __attribute__((unused));
+
 	switch (omap_boot_mode()) {
 	case NAND_MODE_HW_ECC:
 		debug("spl: nand - using hw ecc\n");
@@ -45,26 +49,56 @@ void spl_nand_load_image(void)
 
 	/*use CONFIG_SYS_TEXT_BASE as temporary storage area */
 	header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
+#ifdef CONFIG_SPL_OS_BOOT
+	if (!spl_uboot_key()) {
+		/*
+		 * load parameter image
+		 * load to temp position since nand_spl_load_image reads
+		 * a whole block which is typically larger than
+		 * CONFIG_CMD_SAVEBP_WRITE_SIZE therefore may overwrite
+		 * following sections like BSS
+		 */
+		nand_spl_load_image(CONFIG_CMD_SPL_NAND_OFS,
+			CONFIG_CMD_SPL_WRITE_SIZE,
+			(void *)CONFIG_SYS_TEXT_BASE);
+		/* copy to destintion */
+		for (dst = (int *)CONFIG_SYS_SPL_ARGS_ADDR,
+				src = (int *)CONFIG_SYS_TEXT_BASE;
+				src < (int *)(CONFIG_SYS_TEXT_BASE +
+				CONFIG_CMD_SPL_WRITE_SIZE);
+				src++, dst++) {
+			writel(readl(src), dst);
+		}
 
+		/* load linux */
+		nand_spl_load_image(CONFIG_SYS_NAND_SPL_KERNEL_OFFS,
+			CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
+		spl_parse_image_header(header);
+		nand_spl_load_image(CONFIG_SYS_NAND_SPL_KERNEL_OFFS,
+			spl_image.size, (void *)spl_image.load_addr);
+	} else
+#endif
+	{
 #ifdef CONFIG_NAND_ENV_DST
-	nand_spl_load_image(CONFIG_ENV_OFFSET,
-		CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
-	spl_parse_image_header(header);
-	nand_spl_load_image(CONFIG_ENV_OFFSET, spl_image.size,
-		(void *)image_load_addr);
+		nand_spl_load_image(CONFIG_ENV_OFFSET,
+			CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
+		spl_parse_image_header(header);
+		nand_spl_load_image(CONFIG_ENV_OFFSET, spl_image.size,
+			(void *)spl_image.load_addr);
 #ifdef CONFIG_ENV_OFFSET_REDUND
-	nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND,
-		CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
-	spl_parse_image_header(header);
-	nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND, spl_image.size,
-		(void *)image_load_addr);
+		nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND,
+			CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
+		spl_parse_image_header(header);
+		nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND, spl_image.size,
+			(void *)spl_image.load_addr);
 #endif
 #endif
-	/* Load u-boot */
-	nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
-		CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
-	spl_parse_image_header(header);
-	nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
-		spl_image.size, (void *)spl_image.load_addr);
+		/* Load u-boot */
+		nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
+			CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
+		spl_parse_image_header(header);
+		nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
+			spl_image.size, (void *)spl_image.load_addr);
+	}
 	nand_deselect();
 }