Design for Debuggability

There is a part of writing a Linux BSP that I dread profoundly, and it’s among the most trivial ones. Specifically, I’m talking about that part where you’ve written a new device driver, or modified something in an old one, or you just need to configure it. You’ve added the right incantation in the device tree, you boot, and nothing happens. The module isn’t probed, or your changes are silently ignored.

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