Developers rip apart iPad iOS 4.3, find A5 processor == S5L8940
Some interesting news is coming out of the development community as developers take apart the newly released iOS 4.3 software (or really just publish stuff they've been under NDA about until now).
Context & Ripple Effects
Apple's custom-silicon story has been built on this kind of forensic work before: iFixit's A4 teardown and Ars Technica's analysis of the A4 as a derivative of Samsung's A8 design established in 2010 that Apple's 'A-series' chips are internally tracked under conventional part numbers. With iOS 4.3 now released — per relationships confirmed the same day, alongside syndicated pickups at The Loop — developers are free to publish what they had learned under NDA, and they have done exactly that with the next chip in line.
The finding is narrow but useful: the A5 carries the internal designation S5L8940, meaning the chip is already baked into shipped software builds even though the hardware carrying it has barely reached reviewers' hands.
First-order effects
- Toolmakers and jailbreak-adjacent developers gain a stable identifier for the A5 (S5L8940), letting them target the chip in builds and compatibility work before broad device availability.
Second-order effects
- The teardown-and-analysis ecosystem that documented the A4 gets its roadmap confirmed early, priming benchmark and disassembly coverage for when A5 hardware ships in volume.
Third-order effects
- If the pattern holds, each point iOS release functions as an unofficial registry of Apple's silicon roadmap — software builds leaking the existence and part numbers of chips before any product announcement does.
The trend: Apple's custom A-series silicon is increasingly surfaced through firmware forensics first, with software updates outpacing hardware launches as the public record of its chip roadmap.