stm32mp1: use a specific SD/eMMC partition for U-Boot enviromnent

Save the environment at the end of the U-Boot partition, the GPT
partition named "ssbl" in SD card or eMMC and avoid requirements
on the "bootfs" file system generated via specific raw tools
(like wic and genimage).

With the previous configuration of the U-Boot environment saved in ext4
file, U-Boot need to create/modify the file uenv.txt in the ext4 file
system; so this EXT4 file system need to be generated without some
functionality, like metadata_csum and dir_index, because they are not
supported by U-Boot.
Reviewed-by: NPatrice Chotard <patrice.chotard@st.com>
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>

arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi

@@ -16,6 +16,7 @@
 	config {
 		u-boot,boot-led = "heartbeat";
 		u-boot,error-led = "error";
+		u-boot,mmc-env-partition = "ssbl";
 		st,adc_usb_pd = <&adc1 18>, <&adc1 19>;
 		st,fastboot-gpios = <&gpioa 13 GPIO_ACTIVE_LOW>;
 		st,stm32prog-gpios = <&gpioa 14 GPIO_ACTIVE_LOW>;

arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi

@@ -17,6 +17,7 @@
 	config {
 		u-boot,boot-led = "heartbeat";
 		u-boot,error-led = "error";
+		u-boot,mmc-env-partition = "ssbl";
 		st,fastboot-gpios = <&gpioa 13 GPIO_ACTIVE_LOW>;
 		st,stm32prog-gpios = <&gpioa 14 GPIO_ACTIVE_LOW>;
 	};

configs/stm32mp15_basic_defconfig

@@ -59,13 +59,10 @@ CONFIG_CMD_UBI=y
 # CONFIG_SPL_DOS_PARTITION is not set
 CONFIG_OF_SPL_REMOVE_PROPS="interrupts interrupt-names interrupts-extended interrupt-controller \\\#interrupt-cells interrupt-parent dmas dma-names assigned-clocks assigned-clock-rates assigned-clock-parents hwlocks"
 CONFIG_ENV_IS_NOWHERE=y
-CONFIG_ENV_IS_IN_EXT4=y
+CONFIG_ENV_IS_IN_MMC=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_ENV_IS_IN_UBI=y
 CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
-CONFIG_ENV_EXT4_INTERFACE="mmc"
-CONFIG_ENV_EXT4_DEVICE_AND_PART="0:auto"
-CONFIG_ENV_EXT4_FILE="/uboot.env"
 CONFIG_ENV_UBI_PART="UBI"
 CONFIG_ENV_UBI_VOLUME="uboot_config"
 CONFIG_ENV_UBI_VOLUME_REDUND="uboot_config_r"

configs/stm32mp15_trusted_defconfig

@@ -42,13 +42,10 @@ CONFIG_CMD_MTDPARTS=y
 CONFIG_CMD_UBI=y
 CONFIG_DEFAULT_DEVICE_TREE="stm32mp157c-ev1"
 CONFIG_ENV_IS_NOWHERE=y
-CONFIG_ENV_IS_IN_EXT4=y
+CONFIG_ENV_IS_IN_MMC=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_ENV_IS_IN_UBI=y
 CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
-CONFIG_ENV_EXT4_INTERFACE="mmc"
-CONFIG_ENV_EXT4_DEVICE_AND_PART="0:auto"
-CONFIG_ENV_EXT4_FILE="/uboot.env"
 CONFIG_ENV_UBI_PART="UBI"
 CONFIG_ENV_UBI_VOLUME="uboot_config"
 CONFIG_ENV_UBI_VOLUME_REDUND="uboot_config_r"