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mx6sabreauto: Add Falcon mode support

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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>
Acked-by: Fabio Estevam <fabio.estevam@nxp.com>
This commit is contained in:
Diego Dorta 2017-07-07 15:38:34 -03:00 committed by Stefano Babic
parent 283c2a6553
commit 07f6ddb67a
3 changed files with 83 additions and 0 deletions
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62
board/freescale/mx6sabreauto/README
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@ -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.

7
board/freescale/mx6sabreauto/mx6sabreauto.c
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@ -745,6 +745,13 @@ 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;

14
include/configs/mx6sabreauto.h
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@ -30,6 +30,20 @@
#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
#ifdef CONFIG_MTD_NOR_FLASH
#define CONFIG_SYS_FLASH_BASE WEIM_ARB_BASE_ADDR
#define CONFIG_SYS_FLASH_SECT_SIZE (128 * 1024)