README: clarify re: CONFIG_ARM_APPENDED_DTB in the kernel

recommended by Nicolas Pitre <[email protected]>. Signed-off-by: Jason Cooper <[email protected]>
zonque · Aug 2, 2013 · f0fd618 · f0fd618
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@@ -4,6 +4,9 @@ legacy hardware that has a bootloader which is unable to boot DT kernels.
 It acts as chain loader which determines the correct hardware type and DTB
 blob.
 
+You should disable CONFIG_ARM_APPENDED_DTB in your kernel config.  The
+impedance-matcher should be viewed as a replacement for that option.
+
 It used to be completetly specific to PXA3xx based Raumfeld hardware, but
 was turned into a more generic kind of framework recently.