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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>
This commit is contained in:
Ard Biesheuvel 2017-04-04 14:20:12 +01:00
parent b1f3e48ed8
commit 83ae7589b0
1 changed files with 7 additions and 0 deletions
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7
ArmVirtPkg/Library/PlatformPeiLib/PlatformPeiLib.c
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@ -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);