[U-Boot] [PATCH v2 8/8] pico-imx6: Add Falcon mode

[Otavio Salvador]

From: Fabio Estevam <festevam at gmail.com>

Add Falcon mode support, which allows the SPL to load and
jump to the Linux kernel directly, without the need of loading
U-Boot proper.

CONFIG_SPL_OS_BOOT=y needs to be passed in the defconfig
in order to use Falcon mode.

Signed-off-by: Fabio Estevam <festevam at gmail.com>
Signed-off-by: Otavio Salvador <otavio at ossystems.com.br>
---
 board/technexion/pico-imx6/spl.c | 11 +++++++++++
 include/configs/pico-imx6.h      | 12 ++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/board/technexion/pico-imx6/spl.c b/board/technexion/pico-imx6/spl.c
index 5bf87023ac..06ad0a8c32 100644
--- a/board/technexion/pico-imx6/spl.c
+++ b/board/technexion/pico-imx6/spl.c
@@ -27,6 +27,17 @@
 #define IMX6DQ_DRIVE_STRENGTH		0x30
 #define IMX6SDL_DRIVE_STRENGTH		0x28
 
+#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
+
 /* configure MX6Q/DUAL mmdc DDR io registers */
 static struct mx6dq_iomux_ddr_regs mx6dq_ddr_ioregs = {
 	.dram_sdclk_0 = IMX6DQ_DRIVE_STRENGTH,
diff --git a/include/configs/pico-imx6.h b/include/configs/pico-imx6.h
index 467d5ff4f5..5bbb9ea8f7 100644
--- a/include/configs/pico-imx6.h
+++ b/include/configs/pico-imx6.h
@@ -12,6 +12,18 @@
 
 #include "imx6_spl.h"
 
+#ifdef CONFIG_SPL_OS_BOOT
+/* Falcon Mode */
+#define CONFIG_SPL_FS_LOAD_ARGS_NAME   "args"
+#define CONFIG_SPL_FS_LOAD_KERNEL_NAME "uImage"
+#define CONFIG_SYS_SPL_ARGS_ADDR   0x18000000
+
+/* Falcon Mode - MMC support: args at 1MB kernel at 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
+
 /* Size of malloc() pool */
 #define CONFIG_SYS_MALLOC_LEN		(35 * SZ_1M) /* Increase due to DFU */
 
-- 
2.23.0