Mention that CONFIG_ADDR_MAP only works in the post-relocation phase.

Signed-off-by: Bin Meng <bmeng...@gmail.com>
Reviewed-by: Simon Glass <s...@chromium.org>
Reviewed-by: Priyanka Jain <priyanka.j...@nxp.com>
---

(no changes since v1)

 lib/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Kconfig b/lib/Kconfig
index 7f4c30e..7288340 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -6,6 +6,8 @@ config ADDR_MAP
          Enables helper code for implementing non-identity virtual-physical
          memory mappings for 32bit CPUs.
 
+         This library only works in the post-relocation phase.
+
 config SYS_NUM_ADDR_MAP
        int "Size of the address-map table"
        depends on ADDR_MAP
-- 
2.7.4

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