diff options
Diffstat (limited to 'ArmVirtPkg/Library')
-rw-r--r-- | ArmVirtPkg/Library/NorFlashQemuLib/NorFlashQemuLib.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/ArmVirtPkg/Library/NorFlashQemuLib/NorFlashQemuLib.c b/ArmVirtPkg/Library/NorFlashQemuLib/NorFlashQemuLib.c index 9b1d1184bd..271d7f0efb 100644 --- a/ArmVirtPkg/Library/NorFlashQemuLib/NorFlashQemuLib.c +++ b/ArmVirtPkg/Library/NorFlashQemuLib/NorFlashQemuLib.c @@ -86,6 +86,22 @@ NorFlashPlatformGetDevices ( mNorFlashDevices[Num].BlockSize = QEMU_NOR_BLOCK_SIZE;
Num++;
}
+
+ //
+ // UEFI takes ownership of the NOR flash, and exposes its functionality
+ // through the UEFI Runtime Services GetVariable, SetVariable, etc. This
+ // means we need to disable it in the device tree to prevent the OS from
+ // attaching its device driver as well.
+ // Note that this also hides other flash banks, but the only other flash
+ // bank we expect to encounter is the one that carries the UEFI executable
+ // code, which is not intended to be guest updatable, and is usually backed
+ // in a readonly manner by QEMU anyway.
+ //
+ Status = FdtClient->SetNodeProperty (FdtClient, Node, "status",
+ "disabled", sizeof ("disabled"));
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_WARN, "Failed to set NOR flash status to 'disabled'\n"));
+ }
}
*NorFlashDescriptions = mNorFlashDevices;
|