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First steps in bare-metal programming using UEFI

What HN thinks

A thread that came to learn UEFI and stayed to litigate UTF-16 and FAT like it was 1998.

UEFI inherited Windows' bad choices
Many criticize UEFI's UTF-16 strings, FAT/VFAT and PE32+ formats as Windows baggage that made firmware programming needlessly painful.
Great guide, plenty of prior art
Readers praised the series as clear and human-written, while others pointed to earlier tutorials and additional libraries, languages and tooling for UEFI work.
Debating what counts as bare metal
Some question whether code running atop UEFI firmware is truly bare metal; others say it qualifies since you touch hardware directly once in control.

Consensus: Most agree the article is a useful introduction but that UEFI itself is a weird, Windows-flavoured environment full of sharp edges.

Recommended in the comments

EDK II LibC ↗ (library): Fills the missing C standard library gap in UEFI programming.
uefi-rs ↗ (library): Powers projects like a UEFI IRC client and makes Rust UEFI development practical.
LLVM libc ↗ (library): Offered as another libc option for UEFI programs.
zerosharp ↗ (library): Shows you can write UEFI apps in C#.
Multiboot2 ↗ (other): A simpler alternative to building a UEFI PE32+ image that still allows calling UEFI services.
coreboot (product): Suggested as a saner alternative to UEFI firmware.

Summarised by Claude from the comment thread 6 days ago.

Points: 242
Comments: 48
Best rank: #3
Posted: 2026-11-06 by LaSombra
Category: Programming

uefi bare-metal linux firmware bootloader tutorial-series

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