(三)正点原子STM32MP135移植——optee移植

一、概述

OP-TEE 是一个开源工程,完整的实现了一个可信执行环境。 主要包括 Secure world OS(optee_os)、normal world client(optee_client)、test suite(optee_test/xtest)以及 Linux 驱动部分。

OP-TEE 的全称是 Open-source Portable Trusted Execution Environment,其中 TEE(可信执行环境)是基于 trustzone 技术搭建的安全执行环境。该项目最初由意法半导体(ST)和爱立信发起,是一个专门的解决方案,后来由意法半导体拥有和维护。2014年,Linaro 开始与意法半导体合作,逐步将这个专有的 TEE 解决方案转换成一个开源的 TEE 解决方案。

ARM 公司提出的 trustzone 技术是用一根安全总线(称为 NS 位)来判断系统当前处于 secure world 还是 non-secure world 状态,状态的切换由 ATF(ARM Trusted Firmware)来完成。

二、编译官方代码

进入到optee的目录,里面有这几个文件

1.optee-os-stm32mp-3.19.0-stm32mp-r1-r0.tar.xz 源码压缩包

2.fonts.tar.gz 老实讲我不知道这是啥

3.Makefile.sdk

4.README.HOW_TO.txt 官方给的使用说明

5.series

6.0001-3.19.0-stm32mp-r1.patch 补丁

2.1 解压源码 、打补丁

/* 解压源码 */
tar xf optee-os-stm32mp-3.19.0-stm32mp-r1-r0.tar.xz 

/* 进入源码目录 */
cd cd optee-os-stm32mp-3.19.0-stm32mp-r1/

/* 解压不知名文件 */
tar xf ../fonts.tar.gz

/* 打补丁 */
for p in `ls -1 ../*.patch`; do patch -p1 < $p; done

2.2 修改Makefile.sdk

打开Makefile.sdk,把DEPLOYDIR目录改成这个:

DEPLOYDIR ?= $(SRC_PATH)/../../FIP_artifacts/optee

再把设备树改成这个:

CFG_EMBED_DTB_SOURCE_FILE ?= stm32mp135f-dk

2.3 配置编译环境

/* 加载环境 */
source /opt/st/stm32mp1/4.2.1-openstlinux-6.1-yocto-mickledore-mp1-v23.06.21/environment-setup-cortexa7t2hf-neon-vfpv4-ostl-linux-gnueabi

/* 配置环境变量 */
export FIP_DEPLOYDIR_ROOT=$PWD/../../FIP_artifacts

不要关了这个终端,它已经配置好了,关于这部分的配置,可以看上一篇关于TF-A的解释比较详细。

2.4 编译

make -f ../Makefile.sdk all

最后提示我们:Missing u-boot-stm32mp135f-dk.dtb file in folder: 'FIP_DEPLOYDIR_UBOOT' or 'FIP_DEPLOYDIR_ROOT/u-boot'

没有关系,这是因为还没有编译u-boot,optee、TF-A、u-boot最后会一起打包的,忽视这个警告即可

三、移植

3.1 复制官方文件

cpp 复制代码
/* 进入设备树目录 */
cd core/arch/arm/dts/

/* 复制文件 */
cp stm32mp13-pinctrl.dtsi stm32mp13-pinctrl-atk.dtsi
cp stm32mp135f-dk.dts stm32mp135-atk.dts

打开stm32mp135-atk.dts文件,第一件事先把头文件修改了

cpp 复制代码
// #include "stm32mp13-pinctrl.dtsi"
#include "stm32mp13-pinctrl-atk.dtsi"

3.2 修改电源

这里和TF-A基本移植,删掉i2c4节点,然后增加我们自己的电源描述

首先找到i2c4这个节点,不要犹豫,把它全都删了,干干净净

cpp 复制代码
&i2c4 {
	pinctrl-names = "default";
	pinctrl-0 = <&i2c4_pins_a>;
	i2c-scl-rising-time-ns = <185>;
	i2c-scl-falling-time-ns = <20>;
	clock-frequency = <400000>;
	status = "okay";

	pmic: stpmic@33 {
		compatible = "st,stpmic1";
		reg = <0x33>;
		status = "okay";
		st,wakeup-pin-number = <1>;
		st,notif-it-id = <0>;

		regulators {
			compatible = "st,stpmic1-regulators";
			buck1-supply = <&vin>;
			buck2-supply = <&vin>;
			buck3-supply = <&vin>;
			buck4-supply = <&vin>;
			ldo1-supply = <&vin>;
			ldo4-supply = <&vin>;
			ldo5-supply = <&vin>;
			ldo6-supply = <&vin>;
			vref_ddr-supply = <&vin>;
			pwr_sw1-supply = <&bst_out>;
			pwr_sw2-supply = <&v3v3_ao>;

			vddcpu: buck1 {
				regulator-name = "vddcpu";
				regulator-min-microvolt = <1250000>;
				regulator-max-microvolt = <1350000>;
				regulator-always-on;
				regulator-over-current-protection;

				lp-stop {
					regulator-suspend-microvolt = <1250000>;
				};
				lplv-stop {
					regulator-suspend-microvolt = <900000>;
				};
				lplv-stop2 {
					regulator-off-in-suspend;
				};
				standby-ddr-sr {
					regulator-off-in-suspend;
				};
				standby-ddr-off {
					regulator-off-in-suspend;
				};
			};

			vdd_ddr: buck2 {
				regulator-name = "vdd_ddr";
				regulator-min-microvolt = <1350000>;
				regulator-max-microvolt = <1350000>;
				regulator-always-on;
				regulator-over-current-protection;

				standby-ddr-off {
					regulator-off-in-suspend;
				};
			};

			vdd: buck3 {
				regulator-name = "vdd";
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
				regulator-always-on;
				st,mask-reset;
				regulator-over-current-protection;
			};

			vddcore: buck4 {
				regulator-name = "vddcore";
				regulator-min-microvolt = <1250000>;
				regulator-max-microvolt = <1250000>;
				regulator-always-on;
				regulator-over-current-protection;

				lplv-stop {
					regulator-suspend-microvolt = <900000>;
				};
				lplv-stop2 {
					regulator-suspend-microvolt = <900000>;
				};
				standby-ddr-sr {
					regulator-off-in-suspend;
				};
				standby-ddr-off {
					regulator-off-in-suspend;
				};
			};

			vdd_adc: ldo1 {
				regulator-name = "vdd_adc";
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;

				standby-ddr-sr {
					regulator-off-in-suspend;
				};
				standby-ddr-off {
					regulator-off-in-suspend;
				};
			};

			unused1: ldo2 {
				regulator-name = "ldo2";
			};

			unused2: ldo3 {
				regulator-name = "ldo3";
			};

			vdd_usb: ldo4 {
				regulator-name = "vdd_usb";
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;

				standby-ddr-sr {
					regulator-off-in-suspend;
				};
				standby-ddr-off {
					regulator-off-in-suspend;
				};
			};

			vdd_sd: ldo5 {
				regulator-name = "vdd_sd";
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
				regulator-boot-on;

				standby-ddr-sr {
					regulator-off-in-suspend;
				};
				standby-ddr-off {
					regulator-off-in-suspend;
				};
			};

			v1v8_periph: ldo6 {
				regulator-name = "v1v8_periph";
				regulator-min-microvolt = <1800000>;
				regulator-max-microvolt = <1800000>;

				standby-ddr-sr {
					regulator-off-in-suspend;
				};
				standby-ddr-off {
					regulator-off-in-suspend;
				};
			};

			vref_ddr: vref_ddr {
				regulator-name = "vref_ddr";
				regulator-always-on;

				standby-ddr-sr {
					regulator-off-in-suspend;
				};
				standby-ddr-off {
					regulator-off-in-suspend;
				};
			};

			bst_out: boost {
				regulator-name = "bst_out";
			};

			v3v3_sw: pwr_sw2 {
				regulator-name = "v3v3_sw";
				regulator-active-discharge = <1>;
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
			};
		};
	};
};

再找到scmi_regu节点,不要犹豫,删他个干净

cpp 复制代码
&scmi_regu {
	scmi_vddcpu: voltd-vddcpu {
		reg = <VOLTD_SCMI_STPMIC1_BUCK1>;
		voltd-supply = <&vddcpu>;
	};
	scmi_vdd: voltd-vdd {
		reg = <VOLTD_SCMI_STPMIC1_BUCK3>;
		voltd-supply = <&vdd>;
	};
	scmi_vddcore: voltd-vddcore {
		reg = <VOLTD_SCMI_STPMIC1_BUCK4>;
		voltd-supply = <&vddcore>;
	};
	scmi_vdd_adc: voltd-vdd_adc {
		reg = <VOLTD_SCMI_STPMIC1_LDO1>;
		voltd-supply = <&vdd_adc>;
	};
	scmi_vdd_usb: voltd-vdd_usb {
		reg = <VOLTD_SCMI_STPMIC1_LDO4>;
		voltd-supply = <&vdd_usb>;
	};
	scmi_vdd_sd: voltd-vdd_sd {
		reg = <VOLTD_SCMI_STPMIC1_LDO5>;
		voltd-supply = <&vdd_sd>;
	};
	scmi_v1v8_periph: voltd-v1v8_periph {
		reg = <VOLTD_SCMI_STPMIC1_LDO6>;
		voltd-supply = <&v1v8_periph>;
	};
	scmi_v3v3_sw: voltd-v3v3_sw {
		reg = <VOLTD_SCMI_STPMIC1_PWR_SW2>;
		voltd-supply = <&v3v3_sw>;
	};
};

然后再根节点下面,vin:vin节点后面或者随便哪里,添加我们的电源,至于哪个vin和v3v3_ao要不要应该无所谓把,笔者已经把它删了

cpp 复制代码
vddcore: vddcore {
        compatible = "regulator-fixed";
        regulator-name = "vddcore";
        regulator-min-microvolt = <1250000>;
        regulator-max-microvolt = <1250000>;
        regulator-off-in-suspend;
        regulator-always-on;
	};

	vddcpu: vddcpu {
		compatible = "regulator-fixed";
		regulator-name = "vddcpu";
		regulator-min-microvolt = <1350000>;
		regulator-max-microvolt = <1350000>;
        regulator-off-in-suspend;
        regulator-always-on;
	};	
	
	v3v3: v3v3 {
        compatible = "regulator-fixed";
        regulator-name = "v3v3";
        regulator-min-microvolt = <3300000>;
        regulator-max-microvolt = <3300000>;
        regulator-off-in-suspend;
        regulator-always-on;
    };

	vdd: vdd {
        compatible = "regulator-fixed";
        regulator-name = "vdd";
        regulator-min-microvolt = <3300000>;
        regulator-max-microvolt = <3300000>;
        regulator-off-in-suspend;
        regulator-always-on;
    };

	vdd_usb: vdd_usb {
        compatible = "regulator-fixed";
        regulator-name = "vdd_usb";
        regulator-min-microvolt = <3300000>;
        regulator-max-microvolt = <3300000>;
        regulator-off-in-suspend;
        regulator-always-on;
    };

3.3 删除其它

usart1节点、wakeup_pin_5、tamp节点、ltdc节点、gpiob、gpiod、gpioe、gpioi,

以及aliases节点下的serial1=&usart1。这些都可以删掉,不删掉应该也不大关系。然后根节点下model和compatible可以改成我们自己的板子的信息。

3.4 追加hse

在末尾追加一个节点

cpp 复制代码
&clk_hse {
	st,digbypass;
};

3.5 stm32mp13-pinctrl-atk.dtsi

这个文件改不改都行,笔者直接不改也能跑,要改的话只剩一个usart4的就可以了

四、编译

先去Makefile.sdk里面,把设备树改成我们的板子

CFG_EMBED_DTB_SOURCE_FILE ?= stm32mp135-atk

还记得刚才打开没关闭的终端吗?如果关了,那就要重新设置环境变量了哦!回到2.3节的第二步,重新把环境变量设置好,然后编译

cpp 复制代码
make -f ../Makefile.sdk all

可以看到 FIP_artifacts/optee多了三个文件:

1.tee-header_v2-stm32mp135-atk.bin

2.tee-pageable_v2-stm32mp135-atk.bin

3.tee-pager_v2-stm32mp135-atk.bin

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