This guide describes the procedure to get access to the debug logs
The following tools are required to get access to the debug logs:
Linux based host system with minicom installed
use sudo apt-get install minicom to install
USB to UART adapter
UART cable to connect to the carrierboard
At first you have to connect your UART cable to the Jetson the following way
VCC
VCC
its not recommended to connect this cable. The UART device (in this case the Jetson) should be powered externally
RX
TX
TX
RX
GRD
GRD
Now connect the cable to the USB to UART adapter und connect the USB to your Computer
In case you do not have Minicom already installed use the following command to install it:
sudo apt-get install minicom The following command makes sure that the USB to UART adapter is properly recognized by the linux system.
ls /dev | grep ttyUSB Please check your hardware connection to the USB to UART adapter, If the command does not print ttyUSB0 back to the terminal.
Now everything is set up get the debug logs, you just have to start minicom with the following parameters:
sudo minicom -D /dev/ttyUSB0Your terminal should now look like something like this
Welcome to minicom 2.7.1
OPTIONS: I18n
Compiled on Aug 13 2017, 15:25:34.
Port /dev/ttyUSB0
Press CTRL-A Z for help on special keys
Now connect your Jetson to the powersupply and start it properly. The minicom terminal should print a lot of messages during the boot of the Jetson system ending with a login window to the Linux system.
Welcome to minicom 2.7.1
OPTIONS: I18n
Compiled on Aug 13 2017, 15:25:34.
Port /dev/ttyUSB0, 11:47:06
Press CTRL-A Z for help on special keys
��
[0000.025] W> RATCHET: MB1 binary ratchet value 4 is too large than ratchet level 2 from HW fuses.
[0000.034] I> MB1 (prd-version: 1.5.1.7-t194-41334769-98030a79)
[0000.039] I> Boot-mode: Coldboot
[0000.042] I> Chip revision : A02P
[0000.045] I> Bootrom patch version : 15 (correctly patched)
[0000.050] I> ATE fuse revision : 0x200
[0000.054] I> Ram repair fuse : 0x0
[0000.057] I> Ram Code : 0x1
[0000.059] I> rst_source : 0x0
[0000.062] I> rst_level : 0x0
[0000.065] I> Boot-device: QSPI
[0000.068] I> Qspi flash params source = brbct
[0000.072] I> Qspi using bpmp-dma
[0000.075] I> Qspi clock source : pllp
[0000.079] I> QSPI Flash Size = 64 MB
[0000.082] I> Qspi initialized successfully
[0000.086] W> No valid slot number is found in scratch register
[0000.092] W> Return default slot: _a
[0000.095] I> Active Boot chain : 0
[0000.098] I> Boot-device: QSPI
[0000.101] I> Qspi flash params source = brbct
[0000.107] W> MB1_PLATFORM_CONFIG: device prod data is empty in MB1 BCT.
[0000.114] I> Temperature = 23500
[0000.117] W> Skipping boost for clk: BPMP_CPU_NIC
[0000.122] W> Skipping boost for clk: BPMP_APB
[0000.126] W> Skipping boost for clk: AXI_CBB
[0000.130] W> Skipping boost for clk: AON_CPU_NIC
[0000.134] W> Skipping boost for clk: CAN1
[0000.138] W> Skipping boost for clk: CAN2
[0000.142] I> Boot-device: QSPI
[0000.145] I> Boot-device: QSPI
[0000.148] I> Qspi flash params source = mb1bct
[0000.152] I> Qspi using bpmp-dma
[0000.155] I> Qspi clock source : pllc_out0
[0000.158] I> Qspi reinitialized
[0000.161] I> Qspi flash params source = mb1bct
[0000.167] I> Qspi flash params source = mb1bct
[0000.172] I> ECC region[0]: Start:0x80000000, End:0x780000000
[0000.177] I> ECC region[1]: Start:0x0, End:0x0
...
The debug log that is generated during the Linux startup of the Jetson. It contains a lot of useful information to resolve problems such as problematic devicetree changes. The debug interface provided by the Jetson also give the possibillity to access to a headless system, in case your carrierboard does not support HDMI/DisplayPort output.
1.0
Internal release
1.1
Release
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