I'm trying to build a linux from source on a RK3399 nanopi-m4. I did the below steps: *### Download and compile ARM-TF ### *$ git clone https://github.com/ARM-software/arm-trusted-firmware.git $ make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399 bl31 *### Download and complie U-Boot ### *$ cd .. $ git clone https://gitlab.denx.de/u-boot/u-boot.git $ cd u-boot/ $ git checkout v2019.10 $ make CROSS_COMPILE=arm-linux-gnueabi- nanopi-m4-rk3399_defconfig $ cp ../arm-trusted-firmware/build/rk3399/release/bl31/bl31.elf . $ make ARCH=arm CROSS_COMPILE=aarch64-linux-gnu- $ make ARCH=arm CROSS_COMPILE=aarch64-linux-gnu- u-boot.itb $ ./tools/mkimage -n rk3399 -T rksd -d ./tpl/u-boot-tpl-dtb.bin idbloader.img Image Type: Rockchip RK33 (SD/MMC) boot image Data Size: 47104 bytes $ cat spl/u-boot-spl-dtb.bin >> idbloader.img *### Build kernel ### *$ git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git $ cd linux $ git checkout v5.1
**I've used the arm64 defconfig *** $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig $ make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 *### Create boot.img ### *$ cd .. $ mkdir boot $ cp linux/arch/arm64/boot/dts/rockchip/rk3399-nanopi-m4.dtb boot/ $ cp arch/arm64/boot/Image boot/ $ cp linux/arch/arm64/boot/Image boot/ $ mkdir boot/extlinux $ nano boot/extlinux/extlinux.conf label NanoPi M4 5.1 kernel /boot/Image devicetree /boot/rk3399-nanopi-m4.dtb append earlycon=uart8250,mmio32,0xff1a0000 root=/dev/mmcblk1p1 rootwait $ dd if=/dev/zero of=boot.img bs=1M count=32 $ sudo mkfs.fat boot.img $ mkdir tmp $ sudo mount boot.img tmp/ $ cp -r boot/* tmp/ $ umount tmp *** copy the images to a folder *** $ mkdir images $ cp boot.img images/ $ cp u-boot/idbloader.img images/ $ cp u-boot/u-boot.itb images/ *### Create sd card image ### *$ cd images/
*** I'm using a VM so it was easier to use a loop device to create the image *** $ dd if=/dev/zero of=sdcard.img bs=1024 count=0 seek=400000 || exit 1 $ sudo losetup -f /dev/loop18 $ sudo losetup /dev/loop18 sdcard.img $ sudo dd if=idbloader.img of=/dev/loop18 seek=64 $ sudo dd if=u-boot.itb of=/dev/loop18 seek=16384 $ sudo dd if=boot.img of=/dev/loop18 seek=32768 $ sync
Flush the image(sdcard.img) with etcher to a card and place the card in the board. Plug the UART cable and power on the board. I receive the below message: */U-Boot TPL board init sdram_init: data training failed rk3399_dmc_init DRAM init failed -5/* I'm not sure what am I doing wrong. Can someone help me with this?
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