不用做成makefile，写成./build_boot.sh脚本就行

如果你不想使用Makefile，你可以创建一个名为`build_boot.sh`的bash shell脚本来代替。以下是一个简单的shell脚本示例，包含了上述命令的功能：

#!/bin/bash

# 定义变量
CROSS_COMPILE_64="/home/jc/AM62x/ti-processor-sdk-linux-rt-am62xx-evm-09.02.01.09/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/aarch64-oe-linux/aarch64-oe-linux-"
SYSROOT_64="/home/jc/AM62x/ti-processor-sdk-linux-rt-am64xx-evm-09.02.01.09/linux-devkit/sysroots/aarch64-oe-linux"
CC_64="${CROSS_COMPILE_64}gcc --sysroot=${SYSROOT_64}"

CROSS_COMPILE_32="/home/jc/AM62x/ti-processor-sdk-linux-rt-am62xx-evm-09.02.01.09/k3r5-devkit/sysroots/x86_64-arago-linux/usr/bin/arm-oe-eabi/arm-oe-eabi-"

# 配置并构建64位版本
am62x_evm_a53_defconfig() {
  export ARCH="arm"
  export CROSS_COMPILE="$CROSS_COMPILE_64"
  export CC="$CC_64"
  make -C U-Boot-2023.04 "$@" OUTPUT_DIR=output-image/a53
}

# 构建BL31和BL32
build_bl31() {
  export BL31="/home/jc/AM62x/ti-processor-sdk-linux-rt-am62xx-evm-09.02.01.09/board-support/prebuilt-images/am62xx-evm/bl31.bin"
  export TEE="/home/jc/AM62x/ti-processor-sdk-linux-rt-am62xx-evm-09.02.01.09/board-support/prebuilt-images/am62xx-evm/bl32.bin"
  am62x_evm_a53_defconfig O=./output-image/a53
}

# 执行构建
build_bl31
echo "Build completed."

# 清理
clean() {
  make -2023.04 clean
  rm -rf output-image/a53/*
}
clean

这个脚本首先定义了所需的变量，接着有函数分别对应于Makefile中的各个步骤，如配置、构建BL31等。最后调用`clean`函数进行清理工作。运行这个脚本只需在终端中输入`./build_boot.sh`即可。