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S5L8900
This is the Application Processor shared between the iPhone, iPod touch, and the iPhone 3G. Not much is known about it through official sources. This processor is not used in any of the newest devices, being replaced by the S5L8720, S5L8920, S5L8922 and S5L8930.
Contents
Firmware File Formats
Exploits
iBoot
- Restore Mode - Works up to iOS 1.0.2
- Ramdisk Hack - Works up to iOS 2.0 beta 3
- diags - Works up to iOS 2.0 beta 5
- iBoot Environment Variable Overflow - Works up to iOS 3.1 beta 3
- usb_control_msg(0x21, 2) Exploit - Works up to iOS 3.1.2
Bootrom
Kernel
- BPF STX Kernel Write Exploit - Works up to iOS 3.1.3
- IOSurface Kernel Exploit - Works up to iOS 4.0.1
Userland
- Symlinks - Works up to iOS 1.1.1
- LibTiff - Works up to iOS 1.1.1
- Mknod - Works up to iOS 1.1.2
- Dual Boot Exploit - Works up to iOS 2.0 beta 3
- MobileBackup Copy Exploit - Works up to iOS 3.1.3
- Malformed CFF Vulnerability - Works up to iOS 4.0.1
Boot Chain
VROM (S5L8900)->LLB->iBoot->Kernel->System Software
One of the iPhoneLinux goals are to replace that Boot Chain after iBoot:
VROM (S5L8900)->OpeniBoot->Linux Kernel->X Server->Window Manager
Upgrade Process
Restore Mode
The common upgrade process chain is VROM->DFU Mode->WTF->iBoot->Kernel->Ramdisk->Restore Mode.
DFU Mode
To flash an older version of the iPhone software you have to let your phone reside in DFU Mode. In iTunes you have to press the option key (Mac) or the shift key (Windows) when pressing 'Restore' to be able to manually chose an IPSW.
