Add a README to explain the steps for booting mx6sabresd in different ways: 1. Booting via Normal U-Boot (u-boot.imx) 2. Booting via SPL (SPL and u-boot.img) 3. Booting via Falcon mode (SPL launches the kernel directly)

Signed-off-by: Diego Dorta diego.dorta@nxp.com --- board/freescale/mx6sabresd/README | 103 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 board/freescale/mx6sabresd/README

diff --git a/board/freescale/mx6sabresd/README b/board/freescale/mx6sabresd/README new file mode 100644 index 0000000..5814b9d --- /dev/null +++ b/board/freescale/mx6sabresd/README @@ -0,0 +1,103 @@ +How to use and build U-Boot on mx6sabresd: +---------------------------------- + +Currently there are three methods for booting mx6sabresd boards: + +1. Booting via Normal U-Boot (u-boot.imx) + +2. Booting via SPL (SPL and u-boot.img) + +3. Booting via Falcon mode (SPL launches the kernel directly) + + +1. Booting via Normal U-Boot +---------------------------- + +$ make mx6qsabresd_defconfig (If you want to build for mx6qsabresd) + +or + +$ make mx6dlsabresd_defconfig (If you want to build for mx6dlsabresd) + +$ make + +This will generate the image called u-boot.imx. + +- Flash the u-boot.imx binary into the SD card: + +$ sudo dd if=u-boot.imx of=/dev/sdb bs=1K seek=1 && sync + + +2. Booting via SPL +------------------ + +Other method for building U-Boot on mx6qsabresd and mx6qpsabresd is +through SPL. In order to do so: + +$ make mx6sabresd_spl_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/sdbbs=1K seek=69 && sync + + +3. Booting via Falcon mode +-------------------------- + +$ make mx6sabresd_spl_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 oflag=sync status=none && sync + +- Flash the u-boot.img image into the SD card: + +$ sudo dd if=u-boot.img of=/dev/sdbbs=1K seek=69 oflag=sync status=none && sync + +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: + +- Setup the IP server: + +# setenv serverip <server_ip_address> + +- Download dtb file: + +# dhcp ${fdt_addr} imx6q-sabresd.dtb + +- Download kernel image: + +# dhcp ${loadaddr} uImage + +- Write kernel at 2MB offset: + +# mmc write ${loadaddr} 0x1000 0x4000 + +- Setup kernel bootargs: + +# setenv bootargs "console=ttymxc0,115200 root=/dev/mmcblk1p1 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 + +- Press KEY_VOL_UP key, power up the board and then SPL binary will +launch the kernel directly.

On Tue, Oct 11, 2016 at 11:09 AM, Diego Dorta diego.dorta@nxp.com wrote:

Allow i.MX6Q Sabre SD to load the kernel and dtb via SPL in Falcon mode.

Based on the Falcon mode code for MX6 Gateworks Ventana board.

Signed-off-by: Diego Dorta diego.dorta@nxp.com

board/freescale/mx6sabresd/mx6sabresd.c | 12 ++++++++++++ include/configs/mx6sabresd.h | 12 ++++++++++++ 2 files changed, 24 insertions(+)

diff --git a/board/freescale/mx6sabresd/mx6sabresd.c b/board/freescale/mx6sabresd/mx6sabresd.c index e58c03c..2b6d7be 100644 --- a/board/freescale/mx6sabresd/mx6sabresd.c +++ b/board/freescale/mx6sabresd/mx6sabresd.c @@ -57,6 +57,8 @@ DECLARE_GLOBAL_DATA_PTR;

#define DISP0_PWR_EN IMX_GPIO_NR(1, 21)

+#define KEY_VOL_UP IMX_GPIO_NR(1, 4)

int dram_init(void) { gd->ram_size = imx_ddr_size(); @@ -682,6 +684,16 @@ int checkboard(void) #include <spl.h> #include <libfdt.h>

+#ifdef CONFIG_SPL_OS_BOOT +int spl_start_uboot(void) +{

•   gpio_direction_input(KEY_VOL_UP);
  

•   /* Only enter in Falcon mode if KEY_VOL_UP is pressed */
  

•   return gpio_get_value(KEY_VOL_UP);
  

I would prefer if it booted on falcon by default and vol-up could make it load the U-Boot.img as a recovery option.

+} +#endif

static void ccgr_init(void) { struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR; diff --git a/include/configs/mx6sabresd.h b/include/configs/mx6sabresd.h index 5c2734d..6a7a0d3 100644 --- a/include/configs/mx6sabresd.h +++ b/include/configs/mx6sabresd.h @@ -11,6 +11,7 @@

#ifdef CONFIG_SPL #include "imx6_spl.h" +#undef CONFIG_SPL_EXT_SUPPORT #endif

#define CONFIG_MACH_TYPE 3980 @@ -22,6 +23,17 @@

#include "mx6sabre_common.h"

+/* Falcon Mode */ +#define CONFIG_CMD_SPL +#define CONFIG_SPL_OS_BOOT +#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 */

#define CONFIG_SYS_FSL_USDHC_NUM 3 #if defined(CONFIG_ENV_IS_IN_MMC)

#define CONFIG_SYS_MMC_ENV_DEV 1 /* SDHC3 */

2.7.4

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