JetPack 4.2.1 Kernel boot output

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

With 4.2.1 the kernel output on the serial port is limited to :

Scanning mmc 1:1...
Found /boot/extlinux/extlinux.conf
Retrieving file: /boot/extlinux/extlinux.conf
733 bytes read in 72 ms (9.8 KiB/s)
L4T boot options
1:      primary kernel
Enter choice: 1:        primary kernel
Retrieving file: /boot/initrd
5562393 bytes read in 350 ms (15.2 MiB/s)
Retrieving file: /boot/Image
34179080 bytes read in 1542 ms (21.1 MiB/s)
append: 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_dvf
s=0 touch_id=0@63 video=tegrafb no_console_suspend=1 console=ttyS0,115200n8 debug_uartport=lsport,2 earlyprintk=uart8250-32bit,0x700
06000 maxcpus=4 usbcore.old_scheme_first=1 lp0_vec=0x1000@0xff780000 core_edp_mv=1075 core_edp_ma=4000  root=/dev/mmcblk0p1 rw rootw
ait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0    root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4
 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 quiet
## Flattened Device Tree blob at 83100000
   Booting using the fdt blob at 0x83100000
   reserving fdt memory region: addr=80000000 size=20000
   Using Device Tree in place at 0000000083100000, end 0000000083177282

Starting kernel ...

<hit enter to activate fiq debugger>
[    1.026073] tegradc tegradc.1: dpd enable lookup fail:-19
[    1.537576] Host read timeout at address 545c00c4
[    1.722924] imx219 6-0010: imx219_board_setup: error during i2c read probe (-121)
[    1.730518] imx219 6-0010: board setup failed
[    2.508346] cgroup: cgroup2: unknown option "nsdelegate"
[    3.916865] using random self ethernet address
[    3.921473] using random host ethernet address
[    3.968780] using random self ethernet address
[    3.976279] using random host ethernet address
[    4.091301] random: crng init done
[    4.094710] random: 7 urandom warning(s) missed due to ratelimiting
[    4.429835] tegra-xudc-new 700d0000.xudc: setup request failed: -95

Ubuntu 18.04.2 LTS jetson-desktop ttyS0

How to enable verbose output as per previous JetPack release?

2

Please remove the “quiet” in kernel cmdline in the “extlinux.conf”
→ /boot/extlinux/extlinux.conf

3

Thanks, also do you know if its possible with 4.2.1 to copy new compiled dtb files to the sd card instead of flashing through SDK manager?

4

Normally you have to reflash the dtb. scp would not work.

L4T documentation has some guidance for flashing. You could refer to it first.

5

Found in the file :

TIMEOUT 30
DEFAULT primary

MENU TITLE L4T boot options

LABEL primary
      MENU LABEL primary kernel
      LINUX /boot/Image
      INITRD /boot/initrd
      APPEND ${cbootargs} quiet

# 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}
6

The one after “APPEND” is the kernel command line. Sorry for my typo. It should be “quiet” lol…