Tow-Boot is a relatively new project for bringing some consistency to the way we boot Linux on ARM. This is both aimed at the Linux single board computers but also the new wave of Linux phones.
On these devices the most common platform firmware is U-Boot. In some cases the U-Boot provided with the device is a nice and clean mainline U-Boot, in other cases it’s the U-Boot build provided by the manufacturer of the SoC.
One big difference between x86 computers and the ARM ecosystem is functionality that you’d expect from the bios/uefi in the hardware is actually in most cases part of the operating system that’s installed. This means there’s no consistency at all.
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