diff --git a/configs/a3m071_defconfig b/configs/a3m071_defconfig
index 5356489..ae696b5 100644
--- a/configs/a3m071_defconfig
+++ b/configs/a3m071_defconfig
@@ -11,6 +11,7 @@
 CONFIG_SPL=y
 CONFIG_SPL_NOR_SUPPORT=y
 CONFIG_SPL_OS_BOOT=y
+CONFIG_SYS_OS_BASE=0xfc200000
 CONFIG_HUSH_PARSER=y
 CONFIG_LOOPW=y
 # CONFIG_CMD_SETEXPR is not set
diff --git a/configs/a4m2k_defconfig b/configs/a4m2k_defconfig
index c54689d..144291e 100644
--- a/configs/a4m2k_defconfig
+++ b/configs/a4m2k_defconfig
@@ -12,6 +12,7 @@
 CONFIG_SPL=y
 CONFIG_SPL_NOR_SUPPORT=y
 CONFIG_SPL_OS_BOOT=y
+CONFIG_SYS_OS_BASE=0xfc200000
 CONFIG_HUSH_PARSER=y
 CONFIG_LOOPW=y
 # CONFIG_CMD_SETEXPR is not set
diff --git a/configs/microblaze-generic_defconfig b/configs/microblaze-generic_defconfig
index bc97f60..3dbf48a 100644
--- a/configs/microblaze-generic_defconfig
+++ b/configs/microblaze-generic_defconfig
@@ -16,6 +16,7 @@
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_NOR_SUPPORT=y
 CONFIG_SPL_OS_BOOT=y
+CONFIG_SYS_OS_BASE=0x2c060000
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot-mONStR> "
 CONFIG_CMD_ASKENV=y