p-boot is one of the smallest and fastest GUI featuring smartphone bootloaders ever written. One can never know for sure, because there are no official competitions in this niche space that I know of, but given the low-powered nature of PinePhone, p-boot is bound to impress in a any case.
In 32 KiB binary p-boot will give you:
See the README file for detailed description of all features.
Showcase of p-boot in a video:
The major downside to p-boot is that you can't pronounce its name aloud without a chuckle. ;-)
Keep yourself in the loop about new releases and features via RSS. The latest news:
p-boot is free and opensource software released under GPLv3. It is an independent personal project not backed by any comapny or commercial interests. You can contribute by writing code, helping improve documentation, spreading the word, and/or by donating.
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At the moment, all documentation is in the form of a README file in the p-boot's git repository.
There are no versioned releases, yet. Pre-built binaries of p-boot and ATF/Crust firmware are available in p-boot git repository in the dist/ directory. You don't need to build anything, unless you really want to.
Installation consists of creating a configuration file with boot menu options, writing p-boot binary to eMMC or SD card, and creating a specially crafted boot partition (MBR partition format) using a special tool provided along with p-boot.
Details are available in the README file in the p-boot's git repository. If you have any trouble installing or using p-boot, let me know. It only means that documentation can be improved. :-)
Please report bugs via email:
Project status: p-boot is maintained and actively developed by the original author.
You can join development of p-boot by sending questions, ideas, bugreports and patches to the above mailing address.
GIT repository is available at: https://megous.com/git/p-boot.