devkit8000: Implement and activate direct OS boot

- Implements spl_start_uboot() for devkit8000
- Add configs to activate direct OS boot from SPL

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>

board/timll/devkit8000/devkit8000.c

@@ -41,6 +41,7 @@
 #include <asm/arch/mem.h>
 #include <asm/mach-types.h>
 #include "devkit8000.h"
+#include <asm/gpio.h>
 #ifdef CONFIG_DRIVER_DM9000
 #include <net.h>
 #include <netdev.h>
@@ -161,6 +162,23 @@ void spl_board_prepare_for_linux(void)
 	gpmc_dm9000_config();
 }
 
+/*
+ * devkit8000 specific implementation of spl_start_uboot()
+ *
+ * RETURN
+ * 0 if the button is not pressed
+ * 1 if the button is pressed
+ */
+int spl_start_uboot(void)
+{
+	int val = 0;
+	if (!gpio_request(CONFIG_SPL_OS_BOOT_KEY, "U-Boot key")) {
+		gpio_direction_input(CONFIG_SPL_OS_BOOT_KEY);
+		val = gpio_get_value(CONFIG_SPL_OS_BOOT_KEY);
+		gpio_free(CONFIG_SPL_OS_BOOT_KEY);
+	}
+	return !val;
+}
 #endif
 
 /*

include/configs/devkit8000.h

@@ -35,7 +35,7 @@
 #define CONFIG_OMAP		1	/* in a TI OMAP core */
 #define CONFIG_OMAP34XX		1	/* which is a 34XX */
 #define CONFIG_OMAP3_DEVKIT8000	1	/* working with DevKit8000 */
-
+#define CONFIG_MACH_TYPE	MACH_TYPE_DEVKIT8000
 /*
  * 1MB into the SDRAM to allow for SPL's bss at the beginning of SDRAM
  * 64 bytes before this address should be set aside for u-boot.img's
@@ -327,7 +327,7 @@
 #define CONFIG_SPL_MAX_SIZE		0xB400  /* 45 K */
 #define CONFIG_SPL_STACK		LOW_LEVEL_SRAM_STACK
 
-#define CONFIG_SPL_BSS_START_ADDR	0x80000000 /*CONFIG_SYS_SDRAM_BASE*/
+#define CONFIG_SPL_BSS_START_ADDR       0x80000500 /* leave space for bootargs*/
 #define CONFIG_SPL_BSS_MAX_SIZE		0x80000
 
 /* NAND boot config */
@@ -352,6 +352,9 @@
 #define CONFIG_SYS_SPL_MALLOC_SIZE	0x100000	/* 1 MB */
 
 /* SPL OS boot options */
+#define CONFIG_SPL_OS_BOOT
+#define CONFIG_SPL_OS_BOOT_KEY	26
+
 #define CONFIG_CMD_SPL
 #define CONFIG_CMD_SPL_WRITE_SIZE       0x400 /* 1024 byte */
 #define CONFIG_CMD_SPL_NAND_OFS (CONFIG_SYS_NAND_SPL_KERNEL_OFFS+\