Hello,
dmesg | grep -i kernel
manager@manager-desktop:~$ dmesg | grep -i kernel
[ 0.000000] Kernel command line: tegraid=21.1.2.0.0 ddr_die=4096M@2048M section=512M memtype=0 vpr_resize usb_port_owner_info=0 lane_owner_info=0 emc_max_dvfs=0 touch_id=0@63 video=tegrafb no_console_suspend=1 console=ttyS0,115200n8 debug_uartport=lsport,4 earlyprintk=uart8250-32bit,0x70006000 maxcpus=4 usbcore.old_scheme_first=1 lp0_vec=0x1000@0xff780000 core_edp_mv=1125 core_edp_ma=4000 gpt earlycon=uart8250,mmio32,0x70006000 root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 sdhci_tegra.en_boot_part_access=1 quiet root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 sdhci_tegra.en_boot_part_access=1
[ 0.000000] Memory: 3568412K/4159488K available (15358K kernel code, 2956K rwdata, 6692K rodata, 8640K init, 612K bss, 115940K reserved, 475136K cma-reserved)
[ 0.000000] Virtual kernel memory layout:
[ 0.001814] kmemleak: Kernel memory leak detector disabled
[ 0.208256] DTS File Name: /home/test/Linux_for_Tegra/source/public/kernel/kernel-4.9/arch/arm64/boot/dts/../../../../../../hardware/nvidia/platform/t210/porg/kernel-dts/tegra210-p3448-0002-p3449-0000-b00.dts
[ 0.321315] alternatives: patching kernel code
[ 0.416542] DTS File Name: /home/test/Linux_for_Tegra/source/public/kernel/kernel-4.9/arch/arm64/boot/dts/../../../../../../hardware/nvidia/platform/t210/porg/kernel-dts/tegra210-p3448-0002-p3449-0000-b00.dts
[ 0.554319] eventlib_kernel: keventlib is initialized, test id: 0
[ 1.763794] sysfs: cannot create duplicate filename '/kernel/rt8168_power'
[ 1.763877] WARNING: CPU: 1 PID: 1 at /dvs/git/dirty/git-master_linux/kernel/kernel-4.9/fs/sysfs/dir.c:31 sysfs_warn_dup+0x68/0x88
[ 1.764194] [<ffffff8009610d20>] kernel_init_freeable+0x1a0/0x244
[ 1.764206] [<ffffff8008f63dc0>] kernel_init+0x18/0x108
[ 1.777002] unable to create rt8168_power_saver kernel object!
[ 2.124485] KERNEL: PMC reset status reg: 0x0
[ 2.170869] Freeing unused kernel memory: 8640K
[ 4.569343] WARNING: CPU: 2 PID: 2864 at /dvs/git/dirty/git-master_linux/kernel/kernel-4.9/drivers/spi/spidev.c:767 0xffffff8000f892a8
[ 4.591301] WARNING: CPU: 2 PID: 2864 at /dvs/git/dirty/git-master_linux/kernel/kernel-4.9/drivers/spi/spidev.c:767 0xffffff8000f892a8
[ 4.637157] WARNING: CPU: 2 PID: 2864 at /dvs/git/dirty/git-master_linux/kernel/kernel-4.9/drivers/spi/spidev.c:767 0xffffff8000f892a8
[ 4.693160] WARNING: CPU: 2 PID: 2864 at /dvs/git/dirty/git-master_linux/kernel/kernel-4.9/drivers/spi/spidev.c:767 0xffffff8000f892a8
/boot/extlinux/extlinux.conf
manager@manager-desktop:~$ cat /boot/extlinux/extlinux.conf
TIMEOUT 30
DEFAULT primary
MENU TITLE L4T boot options
LABEL primary
MENU LABEL primary kernel
LINUX /boot/Image
INITRD /boot/initrd
FDT /boot/tegra210-p3448-0002-p3449-0000-b00.dtb
APPEND ${cbootargs} quiet root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 sdhci_tegra.en_boot_part_access=1
# When testing a custom kernel, it is recommended that you create a backup of
# the original kernel and add a new entry to this file so that the device can
# fallback to the original kernel. To do this:
#
# 1, Make a backup of the original kernel
# sudo cp /boot/Image /boot/Image.backup
#
# 2, Copy your custom kernel into /boot/Image
#
# 3, Uncomment below menu setting lines for the original kernel
#
# 4, Reboot
# LABEL backup
# MENU LABEL backup kernel
# LINUX /boot/Image.backup
# INITRD /boot/initrd
# APPEND ${cbootargs}```
Thank you.