diff --git a/meta-ast2400/recipes-kernel/linux/linux-obmc/defconfig b/meta-ast2400/recipes-kernel/linux/linux-obmc/defconfig
index 4766919..914731b 100644
--- a/meta-ast2400/recipes-kernel/linux/linux-obmc/defconfig
+++ b/meta-ast2400/recipes-kernel/linux/linux-obmc/defconfig
@@ -69,6 +69,7 @@
 CONFIG_MTD_BLOCK=y
 CONFIG_MTD_PARTITIONED_MASTER=y
 CONFIG_MTD_SPI_NOR=y
+# CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is not set
 CONFIG_SPI_ASPEED_SMC=y
 CONFIG_MTD_UBI=y
 CONFIG_MTD_UBI_FASTMAP=y
diff --git a/meta-ast2500/recipes-kernel/linux/linux-obmc/defconfig b/meta-ast2500/recipes-kernel/linux/linux-obmc/defconfig
index 29206d1..8cdd082 100644
--- a/meta-ast2500/recipes-kernel/linux/linux-obmc/defconfig
+++ b/meta-ast2500/recipes-kernel/linux/linux-obmc/defconfig
@@ -61,6 +61,7 @@
 CONFIG_MTD_BLOCK=y
 CONFIG_MTD_PARTITIONED_MASTER=y
 CONFIG_MTD_SPI_NOR=y
+# CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is not set
 CONFIG_SPI_ASPEED_SMC=y
 CONFIG_MTD_UBI=y
 CONFIG_MTD_UBI_FASTMAP=y