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pico-imx6: Add Falcon mode
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>
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2 changed files with 23 additions and 0 deletions
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@ -27,6 +27,17 @@
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#define IMX6DQ_DRIVE_STRENGTH 0x30
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#define IMX6SDL_DRIVE_STRENGTH 0x28
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#ifdef CONFIG_SPL_OS_BOOT
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int spl_start_uboot(void)
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{
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/* Break into full U-Boot on 'c' */
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if (serial_tstc() && serial_getc() == 'c')
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return 1;
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return 0;
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}
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#endif
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/* configure MX6Q/DUAL mmdc DDR io registers */
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static struct mx6dq_iomux_ddr_regs mx6dq_ddr_ioregs = {
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.dram_sdclk_0 = IMX6DQ_DRIVE_STRENGTH,
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@ -12,6 +12,18 @@
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#include "imx6_spl.h"
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#ifdef CONFIG_SPL_OS_BOOT
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/* Falcon Mode */
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#define CONFIG_SPL_FS_LOAD_ARGS_NAME "args"
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#define CONFIG_SPL_FS_LOAD_KERNEL_NAME "uImage"
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#define CONFIG_SYS_SPL_ARGS_ADDR 0x18000000
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/* Falcon Mode - MMC support: args@1MB kernel@2MB */
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#define CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR 0x800 /* 1MB */
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#define CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS (CONFIG_CMD_SPL_WRITE_SIZE / 512)
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#define CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR 0x1000 /* 2MB */
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#endif
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/* Size of malloc() pool */
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#define CONFIG_SYS_MALLOC_LEN (35 * SZ_1M) /* Increase due to DFU */
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