diff --git a/meta-witherspoon/recipes-phosphor/flash/phosphor-software-manager.bbappend b/meta-witherspoon/recipes-phosphor/flash/phosphor-software-manager.bbappend
index 336697b..feab2c1 100644
--- a/meta-witherspoon/recipes-phosphor/flash/phosphor-software-manager.bbappend
+++ b/meta-witherspoon/recipes-phosphor/flash/phosphor-software-manager.bbappend
@@ -1,3 +1,4 @@
 BMC_RW_MTD = "bmc"
 BMC_RO_MTD = "alt-bmc+bmc"
 BMC_KERNEL_MTD = "bmc"
+BMC_RW_SIZE = "0x600000"