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### Prerequisite packages
$ sudo apt-get install gcc-arm-linux-gnueabihf gcc-aarch64-linux-gnu libc6-armhf-cross u-boot-tools make gcc swig python3-pyelftools flex

### Building u-boot binaries
$ mkdir BL2 && cd BL2
$ git clone https://github.com/frank-w/u-boot.git -b 2024-04-bpi
$ cd u-boot
$ git apply bl2.patch ## See above - patch content is provided in above block.
$ make mt7988a_bpir4_sd_defconfig
$ export CROSS_COMPILE=aarch64-linux-gnu-
$ ./build.sh

### Building FIP binary
$ cd ../..
$ mkdir FIP && cd FIP
$ git clone https://github.com/frank-w/u-boot.git -b mtk-atf
$ cd u-boot
$ git apply fip.patch ## See above - patch content is provided in above block.

### Copy all u-boot.* files for creating fip.bin
$ cp ../../BL2/u-boot/u-boot.* .
$ ./build.sh


### Both bl2.img and fip.bin are present folder ./build/mt7988/release
$ cd ./build/mt7988/release
$ ls bl2.img fip.bin

### Renaming binaries as per Yocto's wks file
$ mv bl2.img bpi-r4_sdmmc_bl2.img
$ mv fip.bin bpi-r4_sdmmc_fip.bin