Getting Serial console Linux from RPI2

[ankur_r]

Hi All,

I have RPI2 Board with ubuntu linux hp laptop, I want to have its serial console for debugging purpose to move further with yocto, openwrt, uboot+kernel prompt coupling.

Can anybody help me to find out a way to get serial console on my laptop ?

In short I want an interface to debug and to see what going on in the board. The major issue with other methods like VNC and all, we need full setup. But serial console gives good facilities without even as operating system.

Pl help with maximum possible supportive documentation like weblinks, pdf, tutorial available if any..

Thanks & Regards.
Ankur

[klricks]

..But serial console gives good facilities without even as operating system.
...

I think you will at least need a kernal booted maybe more? Or do you really mean JTAG?
For serial you will need a RS232 adapter board with a MAX3232 chip (Not MAX232).
Look for help in the 'bare metal' forum.

[ankur_r]

Hi All,

The challenge is if kernel booted will be there then how the boot, bsp will be debugged ??

I want to debug a bootable chip for example , I have created a uboot+ kernel bootable image memory card and then I need to debug what is happening inside, how that memory card is reacting , from setiap console messages , till what stage the booting process is reached , the init has been loaded zindagi or rootfs has been created, of network has or not like that, additionally how much time it took to prompt etc etc...I need serial console after primary/secondary (minimum possible) boot loader loading ?? After which I can proceed...

Can anybody help me related to this ?? If someone having the idea, humble request you to come with detailed documentation ??

Please help...

Thanks and regards.
Ankur

[HawaiianPi]

Hi All,

I have RPI2 Board with ubuntu linux hp laptop, I want to have its serial console for debugging purpose to move further with yocto, openwrt, uboot+kernel prompt coupling.

Can anybody help me to find out a way to get serial console on my laptop ?

I use cheap CP2102 USB TTL adapters which you can get for less than 2 bucks on ebay (from China), or $6-$8 closer to home. They use 3.3V TTL so they are directly compatible with the Pi GPIO.



From Linux I install screen and use that to open a serial terminal. Lately I've been playing with the Windows Subsystem for Linux (WSL on Windows 10) and from that I enter the following to open a serial terminal (for some reason I have to use sudo with WSL).

Code: Select all

sudo screen /dev/ttyS3 115200

From Linux the device would be something like /dev/ttyUSB0.

Code: Select all

screen /dev/ttyUSB0 115200

Another popular option is minicom, and there are tons of others. This is one of those questions with too many answers.

In short I want an interface to debug and to see what going on in the board. The major issue with other methods like VNC and all, we need full setup. But serial console gives good facilities without even as operating system.

Pretty sure you need some software running, but I don't know much about the other end of the serial console, I just know how to connect to it.