S5L8920

Samsung S5L8920

Application Processor
Designer	Samsung
Manufacturer	Samsung
Clock speed	600 MHz
Instruction set	ARMv7
Core design	65 nm Cortex-A8
Cache	L1: 32 KiB (instructions), 32 KiB (data) L2: 256 KiB
Memory (RAM)	256 MiB LPDDR-400
GPU	PowerVR SGX535, 200 MHz

The Samsung S5L8920 is a system-on-a-chip used in the iPhone 3GS. It is a significant upgrade from its predecessors, with many of its specifications doubled compared to the S5L8900.

S5L8920 is also the first to use the ARMv7 family of instructions, with later versions of the architecture using armv7f/armv7s. It uses the THUMB-2 instruction set, in addition to ARM and THUMB. Binaries included in iOS for the iPhone 3GS and later are compiled only for ARMv7, and are not compatible with older CPUs. However, ARMv6 binaries can still be run on the ARMv7 CPU.

The CPU clock speed is 600 MHz, underclocked from its native 833 MHz.

The iPod touch (3rd generation) uses the S5L8922, a die-shrink from 65 nm to 45 nm.

Bootrom

Bootrom Version: 359.3

Units produced after 2009 week 40 have 359.3 and not vulnerable to the 0x24000 Segment Overflow.

Bootrom Exploits

• 0x24000 Segment Overflow - only in 359.3
• Limera1n Exploit
• alloc8 Exploit

Boot Chain

Bootrom→LLB→iBoot→Kernel→System Software

See also

• Bootrom
• S5L8920 (Hardware)

External Links

• Technical Reference Manual: Cortex A8

Preceded by S5L8720

"A" Series SoCs S5L8920 S5L8922

Succeeded by A4