ArmVirtPkg/PlatformPeiLib: honor DT node 'status' property

In some cases, (e.g., when running QEMU with TrustZone emulation), the
DT may contain DT nodes whose status is set to 'secure'. Similarly, the
status may be set to 'disabled' if the consumer of the DT image is
expected to treat it as if it weren't there.

So check whether a 'status' property is present, and if so, ignore the
node if the status is not 'okay'.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.c b/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.c
index bdf2b57fcb..df52d36533 100644
--- a/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.c
+++ b/ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.c
@@ -39,7 +39,9 @@ PlatformPeim (
   INT32              Node, Prev;

   CONST CHAR8        *Compatible;

   CONST CHAR8        *CompItem;

+  CONST CHAR8        *NodeStatus;

   INT32              Len;

+  INT32              StatusLen;

   CONST UINT64       *RegProp;

   UINT64             UartBase;

 

@@ -83,6 +85,11 @@ PlatformPeim (
       CompItem += 1 + AsciiStrLen (CompItem)) {

 

       if (AsciiStrCmp (CompItem, "arm,pl011") == 0) {

+        NodeStatus = fdt_getprop (Base, Node, "status", &StatusLen);

+        if (NodeStatus != NULL && AsciiStrCmp (NodeStatus, "okay") != 0) {

+          continue;

+        }

+

         RegProp = fdt_getprop (Base, Node, "reg", &Len);

         ASSERT (Len == 16);