ARM: stm32: Add optional manufacturing environment to DH STM32MP15xx DHSOM

Add manufacturing environment into STM32MP15xx DH electronics DHSOM
configuration. This environment is part of every board build, but only
takes effect on systems booted with the dh,stm32mp15xx-dhcor-testbench
device tree, i.e. systems populated with factory build of U-Boot.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>

configs/stm32mp15_dhsom.config

@@ -64,6 +64,7 @@ CONFIG_SYSRESET_SYSCON=y
 CONFIG_SYS_BOOTCOUNT_ADDR=0x5C00A14C
 CONFIG_SYS_MALLOC_F_LEN=0x3000
 CONFIG_SYS_PBSIZE=1050
+CONFIG_PREBOOT="run dh_preboot"
 CONFIG_SYS_SPI_U_BOOT_OFFS=0x80000
 CONFIG_TARGET_DH_STM32MP1_PDK2=y
 CONFIG_USE_SERVERIP=y

include/configs/stm32mp15_dh_dhsom.h

@@ -18,6 +18,8 @@
 #endif
 
 #define STM32MP_BOARD_EXTRA_ENV						\
+	"dh_preboot="							\
+		"run dh_testbench_backward_compat\0"			\
 	"dh_update_sd_to_emmc=" /* Install U-Boot from SD to eMMC */	\
 		"setexpr loadaddr1 ${loadaddr} + 0x1000000 && "		\
 		"load mmc 0:4 ${loadaddr1} boot/u-boot-spl.stm32 && "	\
@@ -61,7 +63,20 @@
 	"stdout=serial\0"						\
 	"stderr=serial\0"						\
 	"update_sf=run dh_update_sd_to_sf\0"				\
-	"usb_pgood_delay=1000\0"
+	"usb_pgood_delay=1000\0"					\
+	/* Old testbench-only backward compatibility environment */	\
+	"dh_testbench_backward_compat="					\
+		"test ${board_name} = \"dh,stm32mp15xx-dhcor-testbench\" && " \
+		"run load_bootenv importbootenv\0"			\
+	"importbootenv="						\
+		"echo Importing environment from DHupdate.ini...;"	\
+		"env import -t ${loadaddr} ${filesize}\0"		\
+	"load_bootenv="							\
+		"usb reset && "						\
+		"load usb ${usbdev}:${usbpart} ${loadaddr} DHupdate.ini && " \
+		"echo \"--> Update: found DHupdate.ini (${filesize} bytes)\"\0" \
+	"usbdev=0\0"							\
+	"usbpart=1\0"
 
 #include <configs/stm32mp15_common.h>