linux 4.4 (since commit 08b3c894e56580b8ed3e601212a25bda974c3cc2
"MIPS: lantiq: Disable xbar fpi burst mode") requires that the xbar is
defined in the .dts of vrx200 (VR9) SoCs.
---
I am not sure if the xbar size is really 0x1000 or if it's smaller/larger.
Unfortunately there doesn't seem to be public information about it, but
at least 0x1000 works.

 target/linux/lantiq/dts/vr9.dtsi | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/target/linux/lantiq/dts/vr9.dtsi b/target/linux/lantiq/dts/vr9.dtsi
index 136483a..df63ce7 100644
--- a/target/linux/lantiq/dts/vr9.dtsi
+++ b/target/linux/lantiq/dts/vr9.dtsi
@@ -75,6 +75,11 @@
                        interrupt-parent = <&icu0>;
                        interrupts = <115>;
                };
+
+               xbar0: xbar@400000 {
+                       compatible = "lantiq,xbar-xway";
+                       reg = <0x400000 0x1000>;
+               };
        };
 
        fpi@10000000 {
@@ -184,7 +189,6 @@
                                0xE105400 0x400>;       /* pci bridge */
                        status = "disabled";
                };
-
        };
 
        vdsl {
-- 
2.6.4
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