The topic of Embedded Linux Development – Part 5 is currently the subject of lively debate — readers and analysts are keeping a close eye on developments.
This is taking place in a dynamic environment: companies’ decisions and competitors’ reactions can quickly change the picture.
Until here, I’ve talked about the embedded Linux development in four stage: toolchain, bootloader, Linux kernel, rootfs. In this tutorial, I will create a SD card image including these and then run it in BeagleBone Black.
Firstly, I need to create two partitions, one for booting and second for rootfs. So plugin the SD card into the PC (I’m on Ubuntu) and create the partitions:
In here, I created the “boot” partition which was formatted with FAT32 and “rootfs” partition with ext4. Why did I create two distinct partitions? The first reason is that the kernel loads and runs the rootfs. So the bootloader cannot reside in the rootfs because of the bootloader runs before the kernel. Second reason is that the bootloader works with FAT32 better (even if the FAT32 size is much bigger).
After that, copy the MLO, u-boot.img, uEnv.txt, zImage, am335x-boneblack.dtb into the “boot” partition. Also copy the your rootfs content into the “rootfs” partition.
That’s it. The SD card is ready to run the BeagleBone Black. So plugin the SD card and then power up the board. Well how to enter into the Debian rootfs? There is a J1 header besides the P9. It’s the serial port. Pin 1 is GND, 4 is RX and 5 is TX. Use FT232R converter to connect these pins to PC.
Reboot the BeagleBone Black and then you will see the u-boot and the kernel messages. Lastly, you will see the login session:
Type the “root” and the password (you set it in previous tutorial). That’s it. You are in the BeagleBone Black terminal.
In the next tutorial, I will show that how to use ssh command so that you can easily make connection over USB cable, not needing to J1 header.
Simmonds C., Mastering Embedded Linux Programming, Packt Publishing, 2015
Embedded Linux system development training, Bootlin, 2024
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Why it matters
News like this often changes audience expectations and competitors’ plans.
When one player makes a move, others usually react — it is worth reading the event in context.
What to look out for next
The full picture will become clear in time, but the headline already shows the dynamics of the industry.
Further statements and user reactions will add to the story.