Reduce the number of bootenv vars

configs/cluster.env.default

@@ -33,6 +33,18 @@ MKS_INIT_CONTROL_PLANE=yes
 # OSUpgrade agent
 MKS_ENABLE_CONTROL_AGENT=yes
 
+# Boot configs
+# usb, emmc
+MKS_BOOT_SOURCE="usb"
+MKS_BOOT_DEV_PREFIX="/dev/sda"
+
+# Depends on your full disk image. This is the default
+MKS_BOOT_PART=A
+MKS_BOOT_DISK=0
+MKS_ROOTFS_PART_A=2
+MKS_ROOTFS_PART_B=3
+MKS_ROOTFS_PART_D=4
+
 MKS_API_SERVER_ENDPOINT=
 MKS_BOOTSTRAP_TOKEN=
 MKS_DISCOVERY_TOKEN_CA_CERT_HASH=