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-rw-r--r--tools/env/README4
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diff --git a/tools/env/README b/tools/env/README
index d8386f7..f8a644e 100644
--- a/tools/env/README
+++ b/tools/env/README
@@ -6,6 +6,10 @@ For the run-time utiltity configuration uncomment the line
#define CONFIG_FILE "/etc/fw_env.config"
in fw_env.h.
+For building against older versions of the MTD headers (meaning before
+v2.6.8-rc1) it is required to pass the argument "MTD_VERSION=old" to
+make.
+
See comments in the fw_env.config file for definitions for the
particular board.