Last time we've talked about how to Manually UEFI Boot Linux and Windows 10 USB from Grub, today we'd like to talk about creating a multi-boot usb stick with grub 2.

Sometimes we need to create multiple linux distribution installation media or bootable usb stick. However, it is always so annoying to re-flush the usb stick again and again.

However, grub actually enables us to boot most of the linux distributions through loop format or iso image files. The iso image format is known for its original design for CD disks or DVD disks so that the distributions are bootable through your CD-ROM drivers. If the distribution is bootable through the CD-ROM drivers and the CD or DVD media is not writable, which it effectively means that we can actually boot from the non-writable iso image file as well.

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When porting drivers on a specific board for a comparatively new linux kernel, it is common to edit the linux device tree files to put together all the device configurations with register values, working modes and pin control offsets set to expected values.

Here in this post we focus on the exact steps one needs to find the correct pin control offset for specific devices. Here we'd take TI's AM4379 (AM437x) chip as an example for this tutorial.

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