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pico-imx6: Add Falcon mode

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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@gmail.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
This commit is contained in:
Fabio Estevam 2019-09-17 22:04:57 -03:00 committed by Stefano Babic
parent 953c2500bc
commit 77ecf95f22
2 changed files with 23 additions and 0 deletions
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11
board/technexion/pico-imx6/spl.c
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@ -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,

12
include/configs/pico-imx6.h
View File

@ -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@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
/* Size of malloc() pool */
#define CONFIG_SYS_MALLOC_LEN (35 * SZ_1M) /* Increase due to DFU */