# ARM-software/arm-trusted-firmware

Read-only mirror of Trusted Firmware-A

Repository: https://github.com/ARM-software/arm-trusted-firmware
Canonical: https://ross.abutalabs.com/products/arm-trusted-firmware
Homepage: https://www.trustedfirmware.org/projects/tf-a
Language: C
License: NOASSERTION
License Family: other
Last push: 2026-08-26T04:40:34+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 4699, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license, no_readme
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2251, forks 1580 (observed 2026-08-28T04:06:30.995315+00:00)

## What it is
Trusted Firmware-A (TF-A) is a reference implementation of secure world software (EL3 firmware, trusted boot, and a small trusted runtime) for Armv7-A, Armv8-A, and Armv9-A application processors. This repository is a read-only GitHub mirror of the official TrustedFirmware.org project, written in C.

## Use cases
- implement secure boot for an Arm SoC
- port EL3 secure monitor firmware to a new Arm platform
- build a Trusted Execution Environment foundation with TrustZone
- bring up a custom Armv8-A board with reference firmware
- comply with Arm security specifications for chip designs

## When to choose
- you are developing or porting firmware for Arm A-Profile processors
- you need a standards-compliant trusted boot and EL3 runtime
- you want the reference implementation of Arm security specifications

## When to avoid
- you need firmware for Cortex-M microcontrollers (use Trusted Firmware-M instead)
- you are looking for a general-purpose bootloader like U-Boot
- you need application-level software rather than low-level secure firmware

## Facets
- artifact type: library
- maturity: active
- function: security, cryptography, embedded
- domain: embedded-systems, security, operating-systems, hardware
- platform: embedded
- tags: firmware, trusted-boot, trustzone, el3, secure-monitor, arm, bootloader, tee

## Member repositories
- ARM-software/arm-trusted-firmware (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:30.995315+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:43:49.769464+00:00, confidence not recorded.
  - homepage: https://www.trustedfirmware.org/projects/tf-a (fetched 2026-08-29T10:23:54.649992+00:00, sha cdde93a5e9b4)
  - site_page: https://www.trustedfirmware.org/about (fetched 2026-08-29T10:23:54.687645+00:00, sha 82d8568dec62)
  - site_page: https://www.trustedfirmware.org/faq (fetched 2026-08-29T10:23:54.714403+00:00, sha bd51b1ab8cef)
  - site_page: https://www.trustedfirmware.org/blog/tf-m-v2-3-0_lts_etc (fetched 2026-08-29T10:23:54.746410+00:00, sha 22e34cf5ddb6)
- Data as of 2026-08-30T08:39:29.467469+00:00.