Boot Order in Pinebook Pro

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I would avoid the SPI flash.  Having a good U-Boot on the eMMC works.  It won't let you boot multiple operating systems on the same media, but it will let you boot from any device.  You easily flash a good U-Boot over the Manjaru one without affecting Manjaru itself.

The one that I use which comes with NetBSD (and can probably be sourced other ways) doesn't have a "menu" but it does have a command interpreter that you can invoke by pressing a key when prompted.

See this: https://youtube.com/shorts/jVab9bcjM_I

That makes sense—keeping a solid U-Boot on eMMC gives flexibility without messing with SPI flash. I’ll check out the NetBSD one. Does it support booting from USB and NVMe smoothly?

Thanks for sharing. I saw this video. its very helpful for me.