vbe: Add a test for the VBE flow into U-Boot proper

Add a test which checks that VBE boots correctly from TPL through to
U-Boot proper.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 75eeaf8..25fd2bc 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -37,6 +37,8 @@
 		i2c0 = "/i2c@0";
 		mmc0 = "/mmc0";
 		mmc1 = "/mmc1";
+		mmc2 = "/mmc2";
+		mmc3 = "/mmc3";
 		pci0 = &pci0;
 		pci1 = &pci1;
 		pci2 = &pci2;
@@ -92,6 +94,11 @@
 			compatible = "u-boot,distro-efi";
 		};
 
+		/*
+		 * This is used for the VBE OS-request tests. A FAT filesystem
+		 * created in a partition with the VBE information appearing
+		 * before the parititon starts
+		 */
 		firmware0 {
 			u-boot,dm-vpl;
 			compatible = "fwupd,vbe-simple";
@@ -104,6 +111,28 @@
 			version-offset = <0x800>;
 			version-size = <0x100>;
 		};
+
+		/*
+		 * This is used for the VBE VPL tests. The MMC device holds the
+		 * binman image.bin file. The test progresses through each phase
+		 * of U-Boot, loading each in turn from MMC.
+		 *
+		 * Note that the test enables this node (and mmc3) before
+		 * running U-Boot
+		 */
+		firmware1 {
+			u-boot,dm-vpl;
+			status = "disabled";
+			compatible = "fwupd,vbe-simple";
+			storage = "mmc3";
+			skip-offset = <0x400000>;
+			area-start = <0>;
+			area-size = <0xe00000>;
+			state-offset = <0xdffc00>;
+			state-size = <0x40>;
+			version-offset = <0xdffe00>;
+			version-size = <0x100>;
+		};
 	};
 
 	fuzzing-engine {
@@ -976,6 +1005,14 @@
 		compatible = "sandbox,mmc";
 	};
 
+	/* This is used for VBE VPL tests */
+	mmc3 {
+		status = "disabled";
+		compatible = "sandbox,mmc";
+		filename = "image.bin";
+		non-removable;
+	};
+
 	pch {
 		compatible = "sandbox,pch";
 	};