[xen staging] arm/docs: Clarify legacy DT bindings on UEFI

[patchbot@xxxxxxx]

commit a0ffee6b145933f411b1c33daa2cdd54e77b2b15
Author:     Luca Fancellu <luca.fancellu@xxxxxxx>
AuthorDate: Wed Oct 13 15:52:02 2021 +0100
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
CommitDate: Wed Oct 13 11:10:06 2021 -0700

    arm/docs: Clarify legacy DT bindings on UEFI
    
    Since the introduction of UEFI boot for Xen, the legacy
    compatible strings were not supported and the stub code
    was checking only the presence of â??multiboot,moduleâ?? to
    require the Xen UEFI configuration file or not.
    The documentation was not updated to specify that behavior.
    
    Add a phrase to docs/misc/arm/device-tree/booting.txt
    to clarify it.
    
    Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 docs/misc/arm/device-tree/booting.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/misc/arm/device-tree/booting.txt 
b/docs/misc/arm/device-tree/booting.txt
index c6a775f4e8..71895663a4 100644
--- a/docs/misc/arm/device-tree/booting.txt
+++ b/docs/misc/arm/device-tree/booting.txt
@@ -51,6 +51,8 @@ Each node contains the following properties:
        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.
+       However when booting Xen using UEFI, the legacy compatible
+       strings are not supported.
 
        - "xen,multiboot-module" equivalent to "multiboot,module"
        - "xen,linux-zimage"     equivalent to "multiboot,kernel"
--
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