S5L8930

A ("System on a Chip") developed by Apple's in-house chip design department. It is currently used in iPad, both models of the iPhone 4 (GSM and CDMA), Apple TV 2G and the iPod touch 4G. Publicly, Apple refers to this chip as the A4.

Bootrom

 * limera1n
 * SHAtter

iBoot

 * Unreleased Untethered iBoot Exploit

Kernel

 * BPF STX Kernel Write Exploit - Works up to iOS 3.2
 * IOSurface Kernel Exploit - Works up to iOS 4.0.1 (excluding iOS 3.2.2)
 * Packet Filter Kernel Exploit - Works up to iOS 4.1
 * HFS Legacy Volume Name Stack Buffer Overflow - Works up to iOS 4.2.8
 * ndrv_setspec Integer Overflow - Works up to iOS 4.3.3

Userland

 * MobileBackup Copy Exploit - Works up to iOS 3.2
 * Malformed CFF Vulnerability - Works up to iOS 4.0.1 (excluding iOS 3.2.2)
 * T1 Font Integer Overflow- Works up to iOS 4.3.3 (excluding 4.2.9 and 4.2.10)

Boot Chain
Bootrom->LLB->iBoot->Kernel->System Software

Specifications

 * CPU: ARM Cortex-A8
 * GPU: PowerVR SGX 535
 * A/V Playback: PowerVR VXD
 * RAM: 256 MB (Apple TV 2G, iPad, and iPod touch 4G) or 512 MB (iPhone 4)

Aside from the iPhone 4's additional RAM and an overall higher clock speed, these are the same specifications as the S5L8920 and S5L8922.

Links

 * http://www.apple.com/ipad/specs/
 * http://www.brightsideofnews.com/news/2010/1/27/apple-a4-soc-unveiled---its-an-arm-cpu-and-the-gpu!.aspx