Linux/PROCESSOR-SDK-AM437X: Rebuilt SDK Linux does not support dropbear

Phillip Holtzman

Tool/software: Linux

The AM437x EVM contains a default SDK Linux OS. If you send it the command "ps | grep dropbear" it responds with "/usr/sbin/dropbear - r /etc/dropbear/dropbear_rsa_host_key".

We need dropbear on the EVM so we can use scp to transfer files from host PC to EVM.

We downloaded the latest SDK Linux source code, rebuilt it, created an SD card, and booted the EVM from the SD card.

Afterwards, dropbear is no longer installed and the EVM no longer responds to scp and SSH commands.

We can ping the EVM, so we know the internet connection is still working.

How do we rebuild the AM437x SDK Linux with dropbear included?

over 6 years ago

0 Bin Liu over 6 years ago

TI__Guru**** 167611 points

Hi Phillip,

Any PC log when trying scp or ssh command?
What are the output of the following commands on the EVM?
# which dropbear
# ls -l /etc/init.d/dropbear
# systemctl status dropbear.service

0 Phillip Holtzman over 6 years ago in reply to Bin Liu

Intellectual 380 points

Default AM437x SDK Linux:
#which dropbear
/usr/sbin/dropbear
#ls -l /etc/init.d/dropbear
-rwxr-xr-x 1 root root 3002 Jul 6 20:09 /etc/init.d/dropbear
#systemctl status dropbear.service
-sh: systemctl: command not found

Rebuilt AM437x SDK Linux:
#which dropbear
which: no dropbear in (/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin)
#ls -l /etc/init.d/dropbear
ls: /etc/init.d/dropbear: No such file or directory
#systemctl status dropbear.service
Unit dropbear.service could not be found.

0 Bin Liu over 6 years ago in reply to Phillip Holtzman

TI__Guru**** 167611 points

Phillip Holtzman said:
Default AM437x SDK Linux:
...
#systemctl status dropbear.service
-sh: systemctl: command not found

Are you sure the 'systemctl' command doesn't exist on the default filesystem? This shouldn't happen.

Phillip Holtzman said:
Rebuilt AM437x SDK Linux:
#which dropbear
which: no dropbear in (/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin)

The rootfs doesn't have dropbear package. How did you rebuild the root filesystem?

0 Phillip Holtzman over 6 years ago in reply to Bin Liu

Intellectual 380 points

When a coworker tried to rebuild the full SDK Linux, he said there were errors which prevented the build, so he only built the "base" or "basic" install.
How do we get an SD card with the latest full version of AM437x SDK Linux? That would solve all of our problems on this project.

0 Bin Liu over 6 years ago in reply to Phillip Holtzman

TI__Guru**** 167611 points

Did you read the documents for the Processor SDK Linux?
software-dl.ti.com/.../Overview.html

Go to "Getting Started Guide", it explains how to use create-sdcard script to create a SD card from the Processor SDK Linux packageto boot the EVM.

0 Phillip Holtzman over 6 years ago in reply to Bin Liu

Intellectual 380 points

Yes, that "Getting Started Guide" is the source for all of our problems, so we're going in circles again.

0 Phillip Holtzman over 6 years ago in reply to Bin Liu

Intellectual 380 points

Following the "Getting Started Guide" is what caused the problem with the SDK Linux rebuild.

0 Bin Liu over 6 years ago in reply to Phillip Holtzman

TI__Guru**** 167611 points

Then what prevents you create the bootable SD card from the latest Processor SDK Linux package? You'd better to describe what the problem is, what you have tried to solve the problem and failed, along with all the logs.

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Linux/PROCESSOR-SDK-AM437X: Rebuilt SDK Linux does not support dropbear