Galaxy S II (GT-I9100)¶

• Table of contents
• Galaxy S II (GT-I9100)
  • Replicant status
  • Replicant installation
  • Replicant usage
  • Replicant build
  • Replicant development
  • Freedom and privacy/security issues
  • Research
    • Hardware table
    • Software Configuration
      • Partitions
      • RECOVERY
    • References

	Device	Galaxy S II (GT-I9100)
	Manufacturer	Samsung
	Release date	May 2011
	Codename	i9100
	Status	Maintained
	Variants	GSM: GT-I9100
	Latest images	Replicant 6.0 0003

Replicant status¶

Replicant 6.0 status

Replicant installation¶

To install Replicant on the Galaxy S II (GT-I9100), see the RecoveryInstallationWithHeimdall and MinorVersionUpgrade wiki pages.

Replicant usage¶

• Galaxy S 2 (I9100) compass calibration

Replicant build¶

Galaxy S 2 (I9100) build

Replicant development¶

• Galaxy S 2 (I9100) serial
• If you don't have the device and need a quick test, see the People page for a list of people having a Galaxy SII (GT-I9100)
• If you already have substantial Replicant contributions, and you need a Galaxy SII (GT-I9100), we could ship one to you

Freedom and privacy/security issues¶

• Proprietary hardware
• Proprietary firmwares, some of which are firmwares loaded by the system
• Proprietary modem system
• Proprietary bootrom
• Proprietary and signed bootloader

Galaxy S 2 (I9100) Privacy/security issues

Research¶

Hardware table¶

Software Configuration¶

• GalaxyS2I9100Pit: Galaxy SII (GT-I9100) PIT (a partition table)

Partitions¶

WARNING some content may not be the same on your device

RECOVERY¶

The RECOVERY partition is not used by the stock bootloader.

What happens with the stock OS and old versions of Android distributions is that both the boot kernel and the recovery are in the KERNEL partition.

• The boot.img is a zImage with an initramfs for both the recovery and the normal boot. That boot.img can be found inside the replicant-6.0 installation zip and it is installed to the KERNEL partition during the Replicant installation.
• The recovery-i9100.img boots directly into the recovery and probably doesn't have the standard boot initramfs

However as distributions like LineageOS tend to use recoveries like TWRP, it was a problem for such distributions.

So people from XDA came with a scheme called isorec which made it into LineageOS 13.

And Replicant 6.0 is based on LineageOS 13, that is probably in Replicant too, even if it's not used for the Replicant installation and recoveries.

So if the RECOVERY partition contains valid lzop-compressed data, which contains a valid cpio archive, then the image flashed in KERNEL will use that as an initramfs for the recovery.

References¶

• Galaxy S 2 (I9100) Service Manual and Schematics
• Exynos 4210 User Manual

These documents are the propriety of Samsung Electronics and are not hosted by the Replicant project.