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D3277.id7604.diff
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Index: sys/dev/pci/pci_pci.c
===================================================================
--- sys/dev/pci/pci_pci.c
+++ sys/dev/pci/pci_pci.c
@@ -957,6 +957,16 @@
#endif
/*
+ * Internal bridges in Cavium ThunderX SoC
+ * behave as subtractive, but they are unable
+ * to be identified. Force setting an appropriate
+ * flag.
+ */
+ case 0xa002177d: /* ThunderX */
+ sc->flags |= PCIB_SUBTRACTIVE;
+ break;
+
+ /*
* The i82380FB mobile docking controller is a PCI-PCI bridge,
* and it is a subtractive bridge. However, the ProgIf is wrong
* so the normal setting of PCIB_SUBTRACTIVE bit doesn't
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D3277: Treat internal bridge as subtractive on ThunderX ARM64
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