diff --git a/common/recipes-phosphor/flash/phosphor-software-manager.bb b/common/recipes-phosphor/flash/phosphor-software-manager.bb
index 5cd017e..725c835 100644
--- a/common/recipes-phosphor/flash/phosphor-software-manager.bb
+++ b/common/recipes-phosphor/flash/phosphor-software-manager.bb
@@ -86,9 +86,11 @@
 BMC_RW_MTD ??= "bmc"
 BMC_RO_MTD ??= "bmc"
 BMC_KERNEL_MTD ??= "bmc"
+BMC_RW_SIZE ??= "0x600000"
 SYSTEMD_SUBSTITUTIONS += "RW_MTD:${BMC_RW_MTD}:obmc-flash-bmc-ubirw.service"
 SYSTEMD_SUBSTITUTIONS += "RO_MTD:${BMC_RO_MTD}:obmc-flash-bmc-ubiro@.service"
 SYSTEMD_SUBSTITUTIONS += "KERNEL_MTD:${BMC_KERNEL_MTD}:obmc-flash-bmc-ubiro@.service"
+SYSTEMD_SUBSTITUTIONS += "RW_SIZE:${BMC_RW_SIZE}:obmc-flash-bmc-ubirw.service"
 
 SRC_URI += "file://obmc-flash-bmc"
 do_install_append() {
diff --git a/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc b/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc
index 12c6c76..d046516 100644
--- a/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc
+++ b/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc
@@ -108,10 +108,14 @@
   rw="${rwmtd#mtd}"
   ubidev="/dev/ubi${rw}"
 
-  # Create a ubi volume of size 4MB, that is the current size of the rwfs image
+  rwsize="$(fw_printenv -n rwfs_size)"
+  if [[ "${imgsize}" != "${rwsize}" ]]; then
+    fw_setenv rwfs_size "${imgsize}"
+  fi
+
   vol="$(findubi "${name}")"
   if [ -z "${vol}" ]; then
-    ubimkvol "${ubidev}" -N "${name}" -s 4MiB
+    ubimkvol "${ubidev}" -N "${name}" -s "${imgsize}"
   fi
 }
 
@@ -387,6 +391,7 @@
   ubirw)
     reqmtd="$2"
     name="$3"
+    imgsize="$4"
     ubi_rw
     ;;
   ubiro)
diff --git a/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc-ubirw.service b/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc-ubirw.service
index 4a955f2..79d0ea3 100644
--- a/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc-ubirw.service
+++ b/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc-ubirw.service
@@ -4,5 +4,5 @@
 [Service]
 Type=oneshot
 RemainAfterExit=no
-ExecStart=/usr/bin/env obmc-flash-bmc ubirw {RW_MTD} rwfs
+ExecStart=/usr/bin/env obmc-flash-bmc ubirw {RW_MTD} rwfs {RW_SIZE}
 SyslogIdentifier=obmc-flash-bmc