xen: arm: document boot module compatibility based on ordering

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>

diff --git a/docs/misc/arm/device-tree/booting.txt b/docs/misc/arm/device-tree/booting.txt
index d967061cddf650c3d9208cf846793e3f69f9a511..ad98bf3cd156a12bdb8ad27cacdd364acd68ef34 100644 (file)
--- a/docs/misc/arm/device-tree/booting.txt
+++ b/docs/misc/arm/device-tree/booting.txt
@@ -23,7 +23,13 @@ Each node contains the following properties:
        compatible string (if one applies) in addition to the generic
        string (which must always be present).
 
-        Xen 4.4 supported a different set of legacy compatible strings
+       Xen will assume that the first module which lacks a more
+       specific compatible string is a "multiboot,kernel" and that
+       the second such is a "multiboot,ramdisk". Any subsequent
+       modules which lack a specific compatiblity string will not
+       receive any special treatment.
+
+       Xen 4.4 supported a different set of legacy compatible strings
        which remain supported such that systems supporting both 4.4
        and later can use a single DTB.