diff --git a/_targets/armv7m7/imxrt105x/build.project b/_targets/armv7m7/imxrt105x/build.project
index 87c8c7c2..992c00a3 100644
--- a/_targets/armv7m7/imxrt105x/build.project
+++ b/_targets/armv7m7/imxrt105x/build.project
@@ -36,63 +36,22 @@ export PORTS_AZURE_SDK=n
 #
 # Platform dependent parameters
 #
-SIZE_PAGE=$((0x200))
-PAGE_MASK=$((0xfffffe00))
+export SIZE_PAGE=$((0x200))
 
 #
 # Project specific build
 #
 
-BOOT_DEVICE="flash0"
-NAME_USER_SCRIPT="user.plo"
-OFFS_USER_SCRIPT=$((0x11000))
-MAGIC_USER_SCRIPT=$((0xdabaabad))
-KERNEL_OFFS=$((0x12000))
+export BOOT_DEVICE="flash0"
+export MAGIC_USER_SCRIPT=dabaabad
 
 
 # Physical kernel address
 KERNEL_PHBASE=$((0x0)) # itcm start address
 KERNEL_PHOFFS=$((0x0))
-export KERNEL_PHADDR=$(printf "%08x" $((KERNEL_PHBASE + KERNEL_PHOFFS)))
+KERNEL_PHADDR=$(printf "%08x" $((KERNEL_PHBASE + KERNEL_PHOFFS)))
+export KERNEL_PHADDR
 
-# All data/code maps need to be cacheable to allow unaligned accesses
-
-# Pre-init script is launched before user script
-PREINIT_SCRIPT=(
-	"map itcm 0x0 0x28000 rwxcb"
-	"map dtcm 0x20000000 0x20048000 rwcb"
-	"map ocram 0x20200000 0x20220000 rwxcb"
-	"map xip1 0x60000000 0x60800000 rxcb"
-	"map io 0x40000000 0x50000000 rw"
-	"phfs usb0 1.2 phoenixd"
-	"phfs flash0 2.0 raw"
-	"console 0.0")
-
-
-# Production user script contains applications to run Phoenix-RTOS
-USER_SCRIPT=(
-	"kernel ${BOOT_DEVICE}"
-	"app ${BOOT_DEVICE} -x dummyfs xip1 dtcm"
-	"app ${BOOT_DEVICE} -x imxrt-multi xip1 dtcm;io"
-	"app ${BOOT_DEVICE} -x psh xip1 dtcm"
-	"wait 2000"
-	"go!")
-
-
-# Example of user dev script which call remotely script
-DEV_USER_SCRIPT=(
-	"echo on"
-	"wait 3000"
-	"call usb0 script-${TARGET_FAMILY}-${TARGET_SUBFAMILY}-dev.plo 5a5aa5a5")
-
-
-REMOTE_USER_SCRIPT=(
-	"5a5aa5a5"
-	"kernel usb0"
-	"app usb0 -x dummyfs ocram dtcm"
-	"app usb0 -x imxrt-multi itcm ocram"
-	"app usb0 -x psh ocram dtcm"
-	"go!")
 
 
 b_build_project() {
@@ -105,7 +64,8 @@ b_build_target() {
 	b_log "Building $TARGET project"
 	b_log "Building phoenix-rtos-loader"
 
-	b_mkscript_preinit
+	image_builder.py script --nvm "$NVM_CONFIG" --script "$PLO_SCRIPT_PREINIT" --out script.plo
+	RAM_SCRIPT=1 image_builder.py script --nvm "$NVM_CONFIG" --script "$PLO_SCRIPT_PREINIT" --out script-ram.plo
 
 	make -C plo all
 
@@ -115,13 +75,8 @@ b_build_target() {
 
 
 b_image_target() {
-	b_mkscript_user "${USER_SCRIPT[@]}"
-	b_prod_image
-
-	# TODO: Fix b_dev_image overwriting user.plo created by b_prod_image
-	cp "$PLO_SCRIPT_DIR/$NAME_USER_SCRIPT" "${PREFIX_BOOT}"
-
-	b_dev_image
+	image_builder.py -v partition --nvm "$NVM_CONFIG" --name user --script "$PLO_SCRIPT_USER"
+	image_builder.py -v disk --nvm "$NVM_CONFIG" --part "plo=${PREFIX_PROG_STRIPPED}plo-${TARGET_FAMILY}-${TARGET_SUBFAMILY}.img" --out "phoenix.disk"
 }
 
 
diff --git a/_targets/armv7m7/imxrt105x/nvm.yaml b/_targets/armv7m7/imxrt105x/nvm.yaml
new file mode 100644
index 00000000..c0436a18
--- /dev/null
+++ b/_targets/armv7m7/imxrt105x/nvm.yaml
@@ -0,0 +1,12 @@
+# example NVM config - based on EVK board
+flash0:
+  # external qspi flash - is25wp064a (64Mbit)
+  size: 0x800000 # 8 MB
+  block_size: 0x1000
+  padding_byte: 0xff
+  partitions:
+    - name: plo
+      offs: 0x0
+    - name: user
+      offs: 0x11000
+      # if size not set - last non-virtual partition will be extnded to the end of flash
diff --git a/_targets/armv7m7/imxrt105x/preinit.plo.yaml b/_targets/armv7m7/imxrt105x/preinit.plo.yaml
new file mode 100644
index 00000000..1ec84425
--- /dev/null
+++ b/_targets/armv7m7/imxrt105x/preinit.plo.yaml
@@ -0,0 +1,22 @@
+size: 0x1000
+is_relative: False
+
+contents:
+  # NOTE: All data/code maps need to be cacheable to allow unaligned accesses
+  - map itcm 0x0 0x28000 rwxcb
+  - map dtcm 0x20000000 0x20048000 rwcb
+  - map ocram 0x20200000 0x20220000 rwxcb
+  - map xip1 0x60000000 0x60800000 rxcb
+  - map io 0x40000000 0x50000000 rw
+  - phfs usb0 1.2 phoenixd
+  - phfs flash0 2.0 raw
+  - console 0.0
+
+  - if: '{{ not(env.RAM_SCRIPT) | default(false) }}'
+    action: call
+    set_base: True
+    device: '{{ env.BOOT_DEVICE }}'
+    filename: user.plo
+    offset: '{{ nvm[env.BOOT_DEVICE].user.offs }}'
+    target_magic: '{{ env.MAGIC_USER_SCRIPT }}'
+
diff --git a/_targets/armv7m7/imxrt105x/user.plo.yaml b/_targets/armv7m7/imxrt105x/user.plo.yaml
new file mode 100644
index 00000000..48eca63b
--- /dev/null
+++ b/_targets/armv7m7/imxrt105x/user.plo.yaml
@@ -0,0 +1,13 @@
+# kernel + initrd
+magic: '{{ env.MAGIC_USER_SCRIPT }}'
+size: 0x1000
+is_relative: True
+
+contents:
+  - kernel {{ env.BOOT_DEVICE }}
+  - app {{ env.BOOT_DEVICE }} -x dummyfs xip1 dtcm
+  - app {{ env.BOOT_DEVICE }} -x imxrt-multi xip1 dtcm;io
+  - app {{ env.BOOT_DEVICE }} -x psh xip1 dtcm
+  #WARN: no flash driver is being run
+  - wait 2000
+  - go!
diff --git a/_targets/armv7m7/imxrt106x/build.project b/_targets/armv7m7/imxrt106x/build.project
index a13e7e1e..c4462fb0 100644
--- a/_targets/armv7m7/imxrt106x/build.project
+++ b/_targets/armv7m7/imxrt106x/build.project
@@ -36,70 +36,21 @@ export PORTS_AZURE_SDK=n
 #
 # Platform dependent parameters
 #
-SIZE_PAGE=$((0x200))
-PAGE_MASK=$((0xfffffe00))
-
+export SIZE_PAGE=$((0x200))
 
 #
 # Project specific build
 #
 
-BOOT_DEVICE="flash1"
-NAME_USER_SCRIPT="user.plo"
-OFFS_USER_SCRIPT=$((0x11000))
-MAGIC_USER_SCRIPT=$((0xdabaabad))
-KERNEL_OFFS=$((0x12000))
+export BOOT_DEVICE="flash1"
+export MAGIC_USER_SCRIPT=dabaabad
 
 
 # Physical kernel address
 KERNEL_PHBASE=$((0x0)) # itcm start address
 KERNEL_PHOFFS=$((0x0))
-export KERNEL_PHADDR=$(printf "%08x" $((KERNEL_PHBASE + KERNEL_PHOFFS)))
-
-# All data/code maps need to be cacheable to allow unaligned accesses
-
-# Pre-init script is launched before user script
-PREINIT_SCRIPT=(
-	"map itcm 0x0 0x28000 rwxcb"
-	"map dtcm 0x20000000 0x20058000 rwcb"
-	"map ocram2 0x20200000 0x20280000 rwxcb"
-	"map aips14 0x40000000 0x40400000 rws"
-	"map aips5 0x42000000 0x42100000 rws"
-	"map xip2 0x60000000 0x64000000 rxcb"
-	"map xip1 0x70000000 0x70400000 rxcb"
-	"phfs usb0 1.2 phoenixd"
-	"phfs flash0 2.0 raw"
-	"phfs flash1 2.1 raw"
-	"console 0.0")
-
-
-# Production user script contains applications to run Phoenix-RTOS
-USER_SCRIPT=(
-	"kernel ${BOOT_DEVICE}"
-	"app ${BOOT_DEVICE} -x dummyfs xip1 ocram2"
-	"app ${BOOT_DEVICE} -x imxrt-multi xip1 ocram2;aips14;aips5"
-	"app ${BOOT_DEVICE} -x psh xip1 ocram2"
-	"app ${BOOT_DEVICE} imxrt-flash ocram2 ocram2;aips14"
-	"wait 2000"
-	"go!")
-
-
-# Example of user dev script which call remotely script
-DEV_USER_SCRIPT=(
-	"echo on"
-	"wait 3000"
-	"call usb0 script-${TARGET_FAMILY}-${TARGET_SUBFAMILY}-dev.plo 5a5aa5a5")
-
-
-REMOTE_USER_SCRIPT=(
-	"5a5aa5a5"
-	"kernel usb0"
-	"app usb0 -x dummyfs ocram2 ocram2"
-	"app usb0 -x imxrt-multi itcm dtcm"
-	"app usb0 -x psh ocram2 ocram2"
-	"copy usb0 imxrt-flash flash1 0x15000 0"
-	"app flash1 imxrt-flash ocram2 dtcm"
-	"go!")
+KERNEL_PHADDR=$(printf "%08x" $((KERNEL_PHBASE + KERNEL_PHOFFS)))
+export KERNEL_PHADDR
 
 
 b_build_project() {
@@ -112,7 +63,8 @@ b_build_target() {
 	b_log "Building $TARGET project"
 	b_log "Building phoenix-rtos-loader"
 
-	b_mkscript_preinit
+	image_builder.py script --nvm "$NVM_CONFIG" --script "$PLO_SCRIPT_PREINIT" --out script.plo
+	RAM_SCRIPT=1 image_builder.py script --nvm "$NVM_CONFIG" --script "$PLO_SCRIPT_PREINIT" --out script-ram.plo
 
 	make -C plo all
 
@@ -122,13 +74,8 @@ b_build_target() {
 
 
 b_image_target() {
-	b_mkscript_user "${USER_SCRIPT[@]}"
-	b_prod_image
-
-	# TODO: Fix b_dev_image overwriting user.plo created by b_prod_image
-	cp "$PLO_SCRIPT_DIR/$NAME_USER_SCRIPT" "${PREFIX_BOOT}"
-
-	b_dev_image
+	image_builder.py -v partition --nvm "$NVM_CONFIG" --name user --script "$PLO_SCRIPT_USER"
+	image_builder.py -v disk --nvm "$NVM_CONFIG" --name flash1 --part "plo=${PREFIX_PROG_STRIPPED}plo-${TARGET_FAMILY}-${TARGET_SUBFAMILY}.img" --out "phoenix.disk"
 }
 
 
diff --git a/_targets/armv7m7/imxrt106x/nvm.yaml b/_targets/armv7m7/imxrt106x/nvm.yaml
new file mode 100644
index 00000000..516ed313
--- /dev/null
+++ b/_targets/armv7m7/imxrt106x/nvm.yaml
@@ -0,0 +1,19 @@
+# example NVM config - based on EVK board
+flash0:
+  # internal flash - W25Q32JV (32Mbit)
+  # not used currently
+  size: 0x400000 # 4 MB
+  block_size: 0x1000
+  padding_byte: 0xff
+
+flash1:
+  # external qspi flash - is25wp064a (64Mbit)
+  size: 0x800000 # 8 MB
+  block_size: 0x1000
+  padding_byte: 0xff
+  partitions:
+    - name: plo
+      offs: 0x0
+    - name: user
+      offs: 0x11000
+      # if size not set - last non-virtual partition will be extnded to the end of flash
diff --git a/_targets/armv7m7/imxrt106x/preinit.plo.yaml b/_targets/armv7m7/imxrt106x/preinit.plo.yaml
new file mode 100644
index 00000000..aa399428
--- /dev/null
+++ b/_targets/armv7m7/imxrt106x/preinit.plo.yaml
@@ -0,0 +1,25 @@
+size: 0x1000
+is_relative: False
+
+contents:
+  # NOTE: All data/code maps need to be cacheable to allow unaligned accesses
+  - map itcm 0x0 0x28000 rwxcb
+  - map dtcm 0x20000000 0x20058000 rwcb
+  - map ocram2 0x20200000 0x20280000 rwxcb
+  - map aips14 0x40000000 0x40400000 rws
+  - map aips5 0x42000000 0x42100000 rws
+  - map xip2 0x60000000 0x64000000 rxcb
+  - map xip1 0x70000000 0x70400000 rxcb
+  - phfs usb0 1.2 phoenixd
+  - phfs flash0 2.0 raw
+  - phfs flash1 2.1 raw
+  - console 0.0
+
+  - if: '{{ not(env.RAM_SCRIPT) | default(false) }}'
+    action: call
+    set_base: True
+    device: '{{ env.BOOT_DEVICE }}'
+    filename: user.plo
+    offset: '{{ nvm[env.BOOT_DEVICE].user.offs }}'
+    target_magic: '{{ env.MAGIC_USER_SCRIPT }}'
+
diff --git a/_targets/armv7m7/imxrt106x/user.plo.yaml b/_targets/armv7m7/imxrt106x/user.plo.yaml
new file mode 100644
index 00000000..cf1451e3
--- /dev/null
+++ b/_targets/armv7m7/imxrt106x/user.plo.yaml
@@ -0,0 +1,13 @@
+# kernel + initrd
+magic: '{{ env.MAGIC_USER_SCRIPT }}'
+size: 0x1000
+is_relative: True
+
+contents:
+  - kernel {{ env.BOOT_DEVICE }}
+  - app {{ env.BOOT_DEVICE }} -x dummyfs xip1 ocram2
+  - app {{ env.BOOT_DEVICE }} -x imxrt-multi xip1 ocram2;aips14;aips5
+  - app {{ env.BOOT_DEVICE }} -x psh xip1 ocram2
+  - app {{ env.BOOT_DEVICE }} imxrt-flash ocram2 ocram2;aips14
+  - wait 2000
+  - go!
diff --git a/_targets/armv7m7/imxrt117x/build.project b/_targets/armv7m7/imxrt117x/build.project
index 0f960b04..c371a326 100644
--- a/_targets/armv7m7/imxrt117x/build.project
+++ b/_targets/armv7m7/imxrt117x/build.project
@@ -34,64 +34,23 @@ export PORTS_CURL=n
 #
 # Platform dependent parameters
 #
-SIZE_PAGE=$((0x200))
-PAGE_MASK=$((0xfffffe00))
+export SIZE_PAGE=$((0x200))
 
 
 #
 # Project specific build
 #
 
+export BOOT_DEVICE="flash0"
+export MAGIC_USER_SCRIPT=dabaabad
 BOOT_DEVICE="flash0"
-NAME_USER_SCRIPT="user.plo"
-OFFS_USER_SCRIPT=$((0x11000))
-MAGIC_USER_SCRIPT=$((0xdabaabad))
-KERNEL_OFFS=$((0x12000))
 
 
 # Physical kernel address
 KERNEL_PHBASE=$((0x0)) # itcm start address
 KERNEL_PHOFFS=$((0x0))
-export KERNEL_PHADDR=$(printf "%08x" $((KERNEL_PHBASE + KERNEL_PHOFFS)))
-
-# All data/code maps need to be cacheable to allow unaligned accesses
-
-# Pre-init script is launched before user script
-PREINIT_SCRIPT=(
-	"map itcm 0x0 0x40000 rwxcb"
-	"map dtcm 0x20000000 0x20028000 rwcb"
-	"map ocram2 0x202c0000 0x20340000 rwxcb"
-	"map aips14 0x40000000 0x41000000 rws"
-	"map aips5 0x42000000 0x42100000 rws"
-	"map xip1 0x30000000 0x30400000 rxcb"
-	"phfs usb0 1.2 phoenixd"
-	"phfs flash0 2.0 raw"
-	"console 0.0")
-
-
-# Production user script contains applications to run Phoenix-RTOS
-USER_SCRIPT=(
-	"kernel ${BOOT_DEVICE}"
-	"app ${BOOT_DEVICE} -x dummyfs xip1 ocram2"
-	"app ${BOOT_DEVICE} -x imxrt-multi xip1 ocram2;aips14;aips5"
-	"app ${BOOT_DEVICE} -x psh xip1 ocram2"
-	"wait 2000"
-	"go!")
-
-# Example of user dev script which call remotely script
-DEV_USER_SCRIPT=(
-	"echo on"
-	"wait 3000"
-	"call usb0 script-${TARGET_FAMILY}-${TARGET_SUBFAMILY}-dev.plo 5a5aa5a5")
-
-
-REMOTE_USER_SCRIPT=(
-	"5a5aa5a5"
-	"kernel usb0"
-	"app usb0 -x dummyfs ocram2 ocram2"
-	"app usb0 -x imxrt-multi itcm dtcm"
-	"app usb0 -x psh ocram2 ocram2"
-	"go!")
+KERNEL_PHADDR=$(printf "%08x" $((KERNEL_PHBASE + KERNEL_PHOFFS)))
+export KERNEL_PHADDR
 
 
 b_build_project() {
@@ -104,7 +63,8 @@ b_build_target() {
 	b_log "Building $TARGET project"
 	b_log "Building phoenix-rtos-loader"
 
-	b_mkscript_preinit
+	image_builder.py script --nvm "$NVM_CONFIG" --script "$PLO_SCRIPT_PREINIT" --out script.plo
+	RAM_SCRIPT=1 image_builder.py script --nvm "$NVM_CONFIG" --script "$PLO_SCRIPT_PREINIT" --out script-ram.plo
 
 	make -C plo all
 
@@ -114,9 +74,8 @@ b_build_target() {
 
 
 b_image_target() {
-	b_mkscript_user "${USER_SCRIPT[@]}"
-	b_prod_image
-	b_dev_image
+	image_builder.py -v partition --nvm "$NVM_CONFIG" --name user --script "$PLO_SCRIPT_USER"
+	image_builder.py -v disk --nvm "$NVM_CONFIG" --part "plo=${PREFIX_PROG_STRIPPED}plo-${TARGET_FAMILY}-${TARGET_SUBFAMILY}.img" --out "phoenix.disk"
 }
 
 
diff --git a/_targets/armv7m7/imxrt117x/nvm.yaml b/_targets/armv7m7/imxrt117x/nvm.yaml
new file mode 100644
index 00000000..c0436a18
--- /dev/null
+++ b/_targets/armv7m7/imxrt117x/nvm.yaml
@@ -0,0 +1,12 @@
+# example NVM config - based on EVK board
+flash0:
+  # external qspi flash - is25wp064a (64Mbit)
+  size: 0x800000 # 8 MB
+  block_size: 0x1000
+  padding_byte: 0xff
+  partitions:
+    - name: plo
+      offs: 0x0
+    - name: user
+      offs: 0x11000
+      # if size not set - last non-virtual partition will be extnded to the end of flash
diff --git a/_targets/armv7m7/imxrt117x/preinit.plo.yaml b/_targets/armv7m7/imxrt117x/preinit.plo.yaml
new file mode 100644
index 00000000..cce7bbe4
--- /dev/null
+++ b/_targets/armv7m7/imxrt117x/preinit.plo.yaml
@@ -0,0 +1,23 @@
+size: 0x1000
+is_relative: False
+
+contents:
+  # NOTE: All data/code maps need to be cacheable to allow unaligned accesses
+  - map itcm 0x0 0x40000 rwxcb
+  - map dtcm 0x20000000 0x20028000 rwcb
+  - map ocram2 0x202c0000 0x20340000 rwxcb
+  - map aips14 0x40000000 0x41000000 rws
+  - map aips5 0x42000000 0x42100000 rws
+  - map xip1 0x30000000 0x30400000 rxcb
+  - phfs usb0 1.2 phoenixd
+  - phfs flash0 2.0 raw
+  - console 0.0
+
+  - if: '{{ not(env.RAM_SCRIPT) | default(false) }}'
+    action: call
+    set_base: True
+    device: '{{ env.BOOT_DEVICE }}'
+    filename: user.plo
+    offset: '{{ nvm[env.BOOT_DEVICE].user.offs }}'
+    target_magic: '{{ env.MAGIC_USER_SCRIPT }}'
+
diff --git a/_targets/armv7m7/imxrt117x/user.plo.yaml b/_targets/armv7m7/imxrt117x/user.plo.yaml
new file mode 100644
index 00000000..2962c6f8
--- /dev/null
+++ b/_targets/armv7m7/imxrt117x/user.plo.yaml
@@ -0,0 +1,12 @@
+# kernel + initrd
+magic: '{{ env.MAGIC_USER_SCRIPT }}'
+size: 0x1000
+is_relative: True
+
+contents:
+  - kernel {{ env.BOOT_DEVICE }}
+  - app {{ env.BOOT_DEVICE }} -x dummyfs xip1 ocram2
+  - app {{ env.BOOT_DEVICE }} -x imxrt-multi xip1 ocram2;aips14;aips5
+  - app {{ env.BOOT_DEVICE }} -x psh xip1 ocram2
+  - wait 2000
+  - go!