Controlling LEDs on Alpine Linux using the command line

By Maximilian Batz | 2020-11-06

We have developed an embedded Raspberry Pi Compute Module carrier board for industrial use: the PCCB. As you can see, there are three (directly) user programmable LEDs on the PCCB: USER / INFO / ACT. These are defined in the device tree. For example, we can define the following in our device tree overlay: //LEDs…

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Debugging the Alpine boot process

By Maximilian Batz | 2019-01-22

As discussed in my previous post, Alpine Linux goes through several stages when it boots. Just after mounting the boot media, and scanning it for apkovl’s (with nlplug-findfs), there is an option for you to get a console, by setting $SINGLEMODE to yes. Setting SINGLEMODE to yes is easy, you simply add the word “single”…

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Alpine boot process on the Raspberry Pi

By Maximilian Batz | 2019-01-10

Today we will have a look at the Alpine Linux boot process on a Raspberry Pi in some detail. The picture shows the contents of a “virgin” SD card with the Alpine image, which has not been booted yet. This picture shows the contents of the boot folder. Initial boot Stages on the Raspberry Pi…

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nlplug-findfs documentation

By Maximilian Batz | 2019-01-09

nlplugfs-findfs usage: %s [options] DEVICE options: -a OUTFILE add paths to found apkovls to OUTFILE -b OUTFILE add found boot repositories to OUTFILE -c CRYPTDEVICE run cryptsetup luksOpen when CRYPTDEVICE is found -h show this help -H HEADERDEVICE use HEADERDEVICE as the LUKS header -k CRYPTKEY path to keyfile -m CRYPTNAME use CRYPTNAME name for…

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