[PATCH v3 4/5] include: env: Add phytec RAUC boot logic

[Leonard Anderweit <l.anderweit@phytec.de>]

Add logic for booting systems with the RAUC update mechanism. This can
be reused by other phytec boards.

Signed-off-by: Leonard Anderweit <l.anderweit@phytec.de>
Tested-by: Teresa Remmet <t.remmet@phytec.de>
---
 include/env/phytec/rauc.env | 52 +++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 include/env/phytec/rauc.env

diff --git a/include/env/phytec/rauc.env b/include/env/phytec/rauc.env
new file mode 100644
index 000000000000..89e17ff70ec6
--- /dev/null
+++ b/include/env/phytec/rauc.env
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+/* Logic to select a boot partition based on environment variables and switch
+ * to the other if the boot fails. */
+
+doraucboot=0
+
+raucbootpart0=1
+raucrootpart0=5
+raucbootpart1=2
+raucrootpart1=6
+
+raucinit=
+	echo Booting RAUC A/B system;
+	test -n "${BOOT_ORDER}" || env set BOOT_ORDER "system0 system1";
+	test -n "${BOOT_system0_LEFT}" || env set BOOT_system0_LEFT 3;
+	test -n "${BOOT_system1_LEFT}" || env set BOOT_system1_LEFT 3;
+	env set raucstatus;
+	for BOOT_SLOT in "${BOOT_ORDER}"; do
+		if test "x${raucstatus}" != "x"; then
+			echo Skipping remaing slots!;
+		elif test "x${BOOT_SLOT}" = "xsystem0"; then
+			if test ${BOOT_system0_LEFT} -gt 0; then
+				echo Found valid slot A, ${BOOT_system0_LEFT} attempts remaining;
+				setexpr BOOT_system0_LEFT ${BOOT_system0_LEFT} - 1;
+				env set mmcpart ${raucbootpart0};
+				env set mmcroot ${raucrootpart0};
+				env set raucargs rauc.slot=system0;
+				env set raucstatus success;
+			fi;
+		elif test "x${BOOT_SLOT}" = "xsystem1"; then
+			if test ${BOOT_system1_LEFT} -gt 0; then
+				echo Found valid slot B, ${BOOT_system1_LEFT} attempts remaining;
+				setexpr BOOT_system1_LEFT ${BOOT_system1_LEFT} - 1;
+				env set mmcpart ${raucbootpart1};
+				env set mmcroot ${raucrootpart1};
+				env set raucargs rauc.slot=system1;
+				env set raucstatus success;
+			fi;
+		fi;
+	done;
+	if test -n "${raucstatus}"; then
+		env delete raucstatus;
+		env save;
+	else
+		echo WARN: No valid slot found;
+		env set BOOT_system0_LEFT 3;
+		env set BOOT_system1_LEFT 3;
+		env delete raucstatus;
+		env save;
+		reset;
+	fi;
-- 
2.25.1