# How to debug linux boot process

**URL:** <https://mangoh.discourse.group/t/how-to-debug-linux-boot-process/252>\
**Category:** Uncategorized\
**Created:** [October 19, 2016, 6:17am UTC](https://mangoh.discourse.group/t/how-to-debug-linux-boot-process/252 "2016-10-19T06:17:44Z")\
**Posts on this page:** 1\
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**Author:** ![Wavefront\_yk](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/wavefront_yk/32/176_2.png) [@Wavefront\_yk](https://mangoh.discourse.group/u/Wavefront_yk)\
**Post date:** [April 28, 2017, 11:44pm UTC](https://mangoh.discourse.group/t/how-to-debug-linux-boot-process/252/14 "2017-04-28T23:44:43Z")

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I am using the blue one (PL2303-Prolific) as well and from what I found from the net, there is issue with driver. I am not able to make it work on windows. However it works well on Ubuntu 16.04, here are the instructions:

1. connect the serial adaptor to usb port of the Ubuntu machine.
2. install minicom in linux machine:

> sudo apt-get install minicom

1. find the usb port that serial connect to:

> dmesg | grep pl2303

1. the output of step3 would indicate which usb port

> [6.804403] usb 1-1.3: pl2303 converter now attached to **ttyUSB0**

1. change file permission to allow minicom to save config using ttyUSB0 as an example

> sudo chmod 755 /dev/ttyUSB0  
> 6.run minicom  
> mnicom -s

1. from the config menu, select “Serial port setup”.
2. press “A”; update A-Serial Device: to what you see in step4. It would look like  
A-Serial Device: /dev/ttyUSB0
3. hit “enter” and then press “E” to select “E-bps/par/Bits: 115200 8N1”
4. hit “enter” and select “save setup as dfl” and select “Exit”

If everything goes well, you will see  
“Welcome to minicom 2.7  
Port /dev/ttyUSB1”

type your user name and password to login to your mangOH board.

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