$ git clone https://source.codeaurora.org/external/imx/imx-atf -b imx_5.4.24_2.1.0
$ cd imx-atf
$ wget -c ftp://ftp.embedian.com/public/smarcimx8m/0001-imx8m-atf-ddr-timing.patch
$ patch -p1 <0001-imx8m-atf-ddr-timing.patch
$ make CROSS_COMPILE=${CC} PLAT=imx8mq bl31
$ cp build/imx8mq/release/bl31.bin ../imx-mkimage/iMX8M/
$ cd ../
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