Jetson Xavier NX - won’t load GUI, can’t get it out of bash environment

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
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Lastly, I’ve included the process I went through so anyone else can follow this and recover their system. I’ve seen some other threads that have had similar issues without a detailed solution.

Note: these instructions assumes the SDK Manager was installed in the $HOME directory.

https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/kernel_custom.html#
– another site Compiling Tegra Source Code | Jetson Tegra X1 and X2 | RidgeRun

$ sudo apt install git-core
– sdk manager must be installed and libraries downloaded
$ cd $HOME/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra
~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra$
$HOME/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra$ ./source_sync.sh
— when asked for tage enter: tegra-l4t-r32.6.1
$HOME/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra$ sudo apt install build-essential bc

–download toolchain
https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/xavier_toolchain.html#

Put in tar in downloads directory
$ cd ~
$ mkdir $HOME/l4t-gcc
$ cd $HOME/l4t-gcc
$ tar xf $HOME/Downloads/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu.tar.xz

$ cd $HOME/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra
~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra$ export TEGRA_KERNEL_OUT=kernel_out
~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra$ export CROSS_COMPILE=$HOME/l4t-gcc/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-
~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra$ export LOCALVERSION=-tegra
~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra$ cd $HOME/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/sources/kernel/kernel-4.9
~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/sources/kernel$ mkdir -p $TEGRA_KERNEL_OUT

– Change sdhci controller

~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/sources/kernel$ sudo vi $HOME/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/sources/hardware/nvidia/platform/t19x/jakku/kernel-dts/common/tegra194-p3668-common.dtsi
Inside the file → hardware/nvidia/platform/t19x/jakku/kernel-dts/common/tegra194-p3668-common.dtsi
These lines will decide the on/off of the sdhci controller.

– Locate this section

sdhci_emmc: sdhci@3460000 {
	uhs-mask = <0x0>;
	nvidia,enable-hwcq;
	status = "okay";
};

– modify to this
sdhci_emmc: sdhci@3460000 {
uhs-mask = <0x0>;
nvidia,enable-hwcq;
status = “disabled”;
};

~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/sources/kernel/kernel-4.9$ make ARCH=arm64 O=$TEGRA_KERNEL_OUT tegra_defconfig
~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/sources/kernel/kernel-4.9$ make ARCH=arm64 O=$TEGRA_KERNEL_OUT -j2 — j2 is number of processors to use
~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/sources/kernel/kernel-4.9$ cp $TEGRA_KERNEL_OUT/arch/arm64/boot/dts/tegra194-p3668-all-p3509-0000.dtb $HOME/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/kernel/dtb/.

~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/sources/kernel/kernel-4.9$ cd $HOME/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra/
~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra$ vi jetson_xavier_nx_devkit.conf
add the line
SKIP_EEPROM_CHECK=“-n”;

source “${LDK_DIR}/p3668.conf.common”;
SKIP_EEPROM_CHECK=“-n”;

BLBlockSize=1048576;
EMMC_CFG=flash_l4t_t194_spi_sd_p3668.xml;
RECROOTFSSIZE=100MiB

~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra$ vi rootfs/boot/extlinux/extlinux.conf
Remove the “quiet” inside this file and this will enable more log in the serial consoel
add “root=/dev/mmcblk0p1” after the APPEND field

TIMEOUT 30
DEFAULT primary

MENU TITLE L4T boot options

LABEL primary
MENU LABEL primary kernel
LINUX /boot/Image
INITRD /boot/initrd
APPEND ${cbootargs} root=/dev/mmcblk1p1

Flash board
~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra$ sudo ./flash.sh jetson-xavier-nx-devkit mmcblk0p1