diff --git a/configs/tb100_defconfig b/configs/tb100_defconfig
index 575bf2d..aebaa6a 100644
--- a/configs/tb100_defconfig
+++ b/configs/tb100_defconfig
@@ -15,6 +15,7 @@
 CONFIG_SYS_PROMPT="[tb100]:~# "
 CONFIG_SYS_CBSIZE=256
 CONFIG_SYS_PBSIZE=284
+CONFIG_SYS_BOOTM_LEN=0x2000000
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_PING=y