i.MX6Q: icorem6: Add falcon mode

Add Falcon mode support in Engicam i.CoreM6 board.
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>

board/engicam/common/spl.c

@@ -39,6 +39,17 @@ static iomux_v3_cfg_t const uart_pads[] = {
 #endif
 };
 
+#ifdef CONFIG_SPL_OS_BOOT
+int spl_start_uboot(void)
+{
+	/* break into full u-boot on 'c' */
+	if (serial_tstc() && serial_getc() == 'c')
+		return 1;
+
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_MX6QDL
 /*
  * Driving strength:

configs/imx6qdl_icore_mmc_defconfig

@@ -48,3 +48,4 @@ CONFIG_DEBUG_UART_CLOCK=24000000
 CONFIG_MXC_UART=y
 CONFIG_IMX_THERMAL=y
 CONFIG_VIDEO_IPUV3=y
+CONFIG_SPL_OS_BOOT=y

include/configs/imx6-engicam.h

@@ -183,6 +183,20 @@
 # define CONFIG_MII
 #endif
 
+/* Falcon Mode */
+#ifdef CONFIG_SPL_OS_BOOT
+# define CONFIG_SPL_FS_LOAD_ARGS_NAME	"args"
+# define CONFIG_SPL_FS_LOAD_KERNEL_NAME	"uImage"
+# define CONFIG_CMD_SPL
+# define CONFIG_SYS_SPL_ARGS_ADDR	0x18000000
+# define CONFIG_CMD_SPL_WRITE_SIZE	(128 * SZ_1K)
+
+/* MMC support: args@1MB kernel@2MB */
+# define CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR		0x800   /* 1MB */
+# define CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS		(CONFIG_CMD_SPL_WRITE_SIZE / 512)
+# define CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR	0x1000  /* 2MB */
+#endif
+
 /* Framebuffer */
 #ifdef CONFIG_VIDEO_IPUV3
 # define CONFIG_IPUV3_CLK		260000000