linux-kernel - [PATCH v2 2/2] ARM: dts: Add nvmem node for BCM2711 bootloader public key

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Date:   Thu, 13 Apr 2023 11:52:06 +0300
From:   "Ivan T. Ivanov" <iivanov@...e.de>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        "Ivan T . Ivanov" <iivanov@...e.de>
Subject: [PATCH v2 2/2] ARM: dts: Add nvmem node for BCM2711 bootloader public key

From: Tim Gover <tim.gover@...pberrypi.com>

Make a copy of the bootloader secure-boot public key available to the OS
via an nvmem node. The placement information is populated by the
Raspberry Pi firmware if a public key is present in the BCM2711
bootloader EEPROM.

Signed-off-by: Tim Gover <tim.gover@...pberrypi.com>
Signed-off-by: Ivan T. Ivanov <iivanov@...e.de>
---
 arch/arm/boot/dts/bcm2711-rpi.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2711-rpi.dtsi b/arch/arm/boot/dts/bcm2711-rpi.dtsi
index 98817a6675b9..e30fbe84f9c3 100644
--- a/arch/arm/boot/dts/bcm2711-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2711-rpi.dtsi
@@ -15,6 +15,7 @@ aliases {
 		ethernet0 = &genet;
 		pcie0 = &pcie0;
 		blconfig = &blconfig;
+		blpubkey = &blpubkey;
 	};
 };
 
@@ -67,6 +68,19 @@ blconfig: nvram@0 {
 		no-map;
 		status = "disabled";
 	};
+
+	/*
+	 * RPi4 will copy the binary public key blob (if present) from the bootloader
+	 * into memory for use by the OS.
+	 */
+	blpubkey: nvram@1 {
+		compatible = "raspberrypi,bootloader-public-key", "nvmem-rmem";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		reg = <0x0 0x0 0x0>;
+		no-map;
+		status = "disabled";
+	};
 };
 
 &v3d {
-- 
2.35.3