Add support for Falcon mode and explain in the README the steps to boot the kernel directly without loading the full U-Boot.
Signed-off-by: Diego Dorta diego.dorta@nxp.com --- board/freescale/mx6sabreauto/README | 62 +++++++++++++++++++++++++++++ board/freescale/mx6sabreauto/mx6sabreauto.c | 7 ++++ include/configs/mx6sabreauto.h | 14 +++++++ 3 files changed, 83 insertions(+)
diff --git a/board/freescale/mx6sabreauto/README b/board/freescale/mx6sabreauto/README index 7e4596a..e8c589b 100644 --- a/board/freescale/mx6sabreauto/README +++ b/board/freescale/mx6sabreauto/README @@ -18,3 +18,65 @@ $ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 && sync - Flash the u-boot.img binary into the SD card:
$ sudo dd if=u-boot.img of=/dev/sdX bs=1K seek=69 && sync + +Booting via Falcon mode +----------------------- + +Write in mx6sabreauto_defconfig the following define below: + +CONFIG_SPL_OS_BOOT=y + +In order to build it: + +$ make mx6sabreauto_defconfig + +$ make + +This will generate the SPL image called SPL and the u-boot.img. + +- Flash the SPL image into the SD card: + +$ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 && sync + +- Flash the u-boot.img image into the SD card: + +$ sudo dd if=u-boot.img of=/dev/sdb bs=1K seek=69 && sync + +Create a FAT16 boot partition to store uImage and the dtb file, then copy the files there: + +$ sudo cp uImage /media/boot + +$ sudo cp imx6dl-sabreauto.dtb /media/boot + +Create a partition for root file system and extract it there: + +$ sudo tar xvf rootfs.tar.gz -C /media/root + +The SD card must have enough space for raw "args" and "kernel". +To configure Falcon mode for the first time, on U-Boot do the following commands: + +- Load dtb file from boot partition: + +# load mmc 0:1 ${fdt_addr} imx6dl-sabreauto.dtb + +- Load kernel image from boot partition: + +# load mmc 0:1 ${loadaddr} uImage + +- Write kernel at 2MB offset: + +# mmc write ${loadaddr} 0x1000 0x4000 + +- Setup kernel bootargs: + +# setenv bootargs "console=ttymxc3,115200 root=/dev/mmcblk0p1 rootfstype=ext4 rootwait quiet rw" + +- Prepare args: + +# spl export fdt ${loadaddr} - ${fdt_addr} + +- Write args 1MB data (0x800 sectors) to 1MB offset (0x800 sectors) + +# mmc write 18000000 0x800 0x800 + +- Restart the board and then SPL binary will launch the kernel directly. diff --git a/board/freescale/mx6sabreauto/mx6sabreauto.c b/board/freescale/mx6sabreauto/mx6sabreauto.c index 927ebe4..975a53c 100644 --- a/board/freescale/mx6sabreauto/mx6sabreauto.c +++ b/board/freescale/mx6sabreauto/mx6sabreauto.c @@ -738,6 +738,13 @@ int board_ehci_power(int port, int on) #include <spl.h> #include <libfdt.h>
+#ifdef CONFIG_SPL_OS_BOOT +int spl_start_uboot(void) +{ + return 0; +} +#endif + static void ccgr_init(void) { struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR; diff --git a/include/configs/mx6sabreauto.h b/include/configs/mx6sabreauto.h index fd0d5ce..352a28d 100644 --- a/include/configs/mx6sabreauto.h +++ b/include/configs/mx6sabreauto.h @@ -31,6 +31,20 @@
#include "mx6sabre_common.h"
+/* 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) + +/* Falcon Mode - 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 + #define CONFIG_SYS_FLASH_BASE WEIM_ARB_BASE_ADDR #define CONFIG_SYS_FLASH_SECT_SIZE (128 * 1024) #define CONFIG_SYS_MAX_FLASH_BANKS 1 /* max number of memory banks */