diff --git a/rk1808/parameter-buildroot.txt b/rk1808/parameter-buildroot.txt
index 2db38c0..037c9a8 100644
--- a/rk1808/parameter-buildroot.txt
+++ b/rk1808/parameter-buildroot.txt
@@ -8,5 +8,5 @@ MACHINE: 1808
 CHECK_MASK: 0x80
 PWR_HLD: 0,0,A,0,1
 TYPE: GPT
-CMDLINE: mtdparts=rk29xxnand:0x00002000@0x00004000(uboot),0x00002000@0x00006000(trust),0x00002000@0x00008000(misc),0x00010000@0x0000a000(boot),0x00010000@0x0001a000(recovery),0x00010000@0x0002a000(backup),0x00020000@0x0003a000(oem),0x00100000@0x0005a000(rootfs),-@0x0015a000(userdata:grow)
+CMDLINE: mtdparts=rk29xxnand:0x00002000@0x00004000(uboot),0x00002000@0x00006000(trust),0x00002000@0x00008000(misc),0x00010000@0x0000a000(boot),0x00010000@0x0001a000(recovery),0x00010000@0x0002a000(backup),0x00020000@0x0003a000(oem),0x00200000@0x0005a000(rootfs),-@0x0025a000(userdata:grow)
 uuid:rootfs=614e0000-0000-4b53-8000-1d28000054a9