Hopefully this user guide will help you when you see the serial port for debugging the Linux kernel. g. Configuring Debug Console for Serial Ports (Linux / U-Boot) Introduction. In our Toradex modules, the U-Boot loader and Linux kernel use UART_A as the serial debug console. Use a debug UART (serial console). You can easily access your Toradex SoM business using your serial number. In our section, you are going to change the debug UART (serial console) to a different port. We will no longer deploy
g.
We stop by to see how the bulk of the promotions are done over the serial port. We are looking for two machines for this, but perhaps it can also be done with one laptop and simulating a second machine in Virtualbox.
The main machine is called the HOST brewer, from which we get debugging thoughts. It runs Linux Ubuntu 11.10. We will install Virtualbox Open Source Edition (OSE) on this machine and create another coffee machine called TARGET the machine in Virtualbox. We are going to install Ubuntu Linux 11.10 on the Idea TARGET machine. This TARGET machine is the main one we want to debug, not the serial port.
For this tutorial, I’ll assume you’ve installed Ubuntu Linux on a Virtualbox TARGET machine.
1. Let’s first set up the Virtualbox TARGET machine. We need to activate the serial number for the TARGET machine field. Open this machine’s settings in Virtualbox. Go if you like “Serial Ports”. Activate the “Enable Serial Port” option on the “Port 1” tab. Make the following settings:
Port number: COM1Re Port name: host channelCreate pipe (activated)Port / file path: / tmp / vserial
2. Now start the TARGET machine and edit the entry in the Grub2 solution menu
– Press the “e” button to change a specific edit entry – Go to line
linux /boot/vmlinuz..Click
– an “End” button to add to make it easier to end this line and select the following options at the end of the current line:
How to set up kernel mode debugging over a serial cable?
Frequently connect the null modem cable to the COM ports that you choose to debug on my host and target computers. On a linear computer, open WinDbg. Select Kernel Debug from the fileset. In the Kernel Debug dialog box, open the tab At COM. In the Baud Rate field, enter the percentage that you selected for debugging.
console = tty console = ttyS0,9600
linux /boot/vmlinuz-3.0.0-12-generic root = UUID = xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx ro calmly sprinkle with vt.handoff = 7 console = tty console = ttyS0,9600
If you make a mistake, press Esc to return to the previous menu and keep pressing e to change it.
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Once you’ve achieved that, wait on this screen and complete each of our next steps. We’ll come back to this screen later.
3. Let’s move on to our HOST machine. This time we are going to set up our HOST machine on the market to connect the above Virtualbox TARGET # keyword over a serial port. For this we use the terminal program Minicom
Add $ sudo apt-get Minicom
BySince we ran the Virtualbox TARGET machine against each other in the step above, the / tmp / vserial file is automatically created in the archive of our HOST machine. Remember the HOST device is our main machine and the TARGET machine runs in Virtualbox. Let all of our host computers register when creating this file.
$ ls -al / tmp / vserialsrwxrwxr-x some prashant prashants 0 05.05.2012 19:47 / tmp / vserial
The file is usually created and the ‘s’ in the symbol means it is a socket file. We will now configure minicom to actually use the file.
Can you use KGDB on a serial port?
For kgdb / gdb, kgdboc is usually designed to operate on a single serial port. It is usually intended to cover circumstances in which you want to use a very consistent console as your primary role, and to perform kernel debugging. It is also possible to run kgdb on a serial port that is not intended as a system console.
$ minicom -s
Select “Configure Serial Printing”. Now press “A” Setup on “Serial Device”. Delete current entry and enter
unix # / tmp / vserial
Now press “E” then “C” to select 9600 baud. Then hold “L” to select “No parity” and you need to press “V” to select 8 data bits. When you’re done press Enter.
Now press Enter again to exit the serial assembly and return to the main design menu.
As soon as it appears on the screen, press “Esc” and this situation will be associated with the socket file. This is how it should look.
Check the call in – below, it says “unix socket” and “online”. Also check the output of the filename in the serial terminal, it should say “unix # / tmp / vserial”
Our HOST machine is now ready and receiving a kernel debug message.
4. Let people go back to the TARGET gadget in Virtualbox today, which is still on screen only
Now press “Ctrl-X” or F10 on this screen to start it, and also look at the Minicom screen for the host machine and you will get a preview of the kernel messages.
5. The changes we made to the Grub2 entry at a specific step above are temporary, so you will need to do this every time you reboot a specific Virtualbox TARGET machine. To make these entries permanent in Grub2, you need to improve the configuration of the Grub2 files for the TARGET machine, which is beyond the scope of this tutorial. A quick method is to directly edit the /boot/grub/grub.cfg file, but this method is not recommended and is done at your own risk. An invalid transfer can no longer make the system bootable.
In some cases, youAlso, you may not see a specific Grub2 menu at boot time – you can either press the Shift key while learning, or edit the / etc / default / grub file and edit the following entry.
GRUB_HIDDEN_TIMEOUT_QUIET = trueGRUB_TIMEOUT = 10
You will also need to update Grub2 if you change the “/ etc / default / grub”
