verdin-imx8mm: use preboot for fdtfile evaluation

Enable and set preboot var with fdtfile evaluation.
It will be checked and run immediately before starting the
CONFIG_BOOTDELAY countdown and/or running the auto-boot command resp.
entering interactive mode.

This provides possibility to use different boot cmds in interactive mode
without manual setting fdtfile value, as it it's already evaluated
before entering interactive mode.

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>

diff --git a/configs/verdin-imx8mm_defconfig b/configs/verdin-imx8mm_defconfig
index ced0d0a..ed14ff3 100644 (file)
--- a/configs/verdin-imx8mm_defconfig
+++ b/configs/verdin-imx8mm_defconfig
@@ -26,7 +26,8 @@ CONFIG_SPL_LOAD_FIT=y
 # CONFIG_USE_SPL_FIT_GENERATOR is not set
 CONFIG_OF_SYSTEM_SETUP=y
 # CONFIG_USE_BOOTCOMMAND is not set
-CONFIG_DEFAULT_FDT_FILE="fsl-imx8mm-verdin-dev.dtb"
+CONFIG_USE_PREBOOT=y
+CONFIG_PREBOOT="setenv fdtfile imx8mm-verdin-${variant}-${fdt_board}.dtb"
 CONFIG_LOG=y
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_DISPLAY_BOARDINFO_LATE=y