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¶

Galaxy S 2 (I9100) freedom 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¶

Component	Name	Source	Status
SoC	Samsung Exynos 4210	Linux kernel	Linux kernel support
GPU	Mali 400	https://secure.wikimedia.org/wikipedia/en/wiki/Exynos	Linux kernel support, proprietary userspace
Audio Codec	Yamaha MC1N2	Linux kernel	Linux kernel support (ALSA), free userspace: Yamaha-MC1N2-Audio/Tinyalsa-Audio
Modem	XMM6260	Linux kernel	Free userspace implementation: Samsung-RIL/libsamsung-ipc
Wi-Fi	BCM4330	Linux kernel	Linux kernel support, proprietary loaded firmware
Bluetooth	BCM4330	Linux kernel	Linux kernel support, proprietary loaded firmware
NFC	PN544	Linux kernel	Linux kernel support
GPS	GSD4t	http://www.csr.com/news/pr/release/455/en	Proprietary userspace, no free implementation: GSD4t
Accelerometer	K3DH	Linux kernel	Linux kernel support, free userspace
Compass	AKM8975	Kernel sources	Linux kernel support, free userspace
Light	Capella CM3663	Linux kernel support, free userspace
Proximity	Capella CM3663	Linux kernel support, free userspace
FM Radio	SI4709	Linux kernel	Linux kernel support
Camera (back)	Fujitsu M5MO	Linux kernel support, free userspace
Camera (front)	Samsung S5K5BAFX	Linux kernel support, free userspace
Touchscreen	Atmel MXT224	Linux kernel support
Display	LD9040	Linux kernel support
Power Management IC (PMIC)	Maxim MAX8997	Kernel sources	Linux kernel support

Software Configuration¶

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

Partitions¶

WARNING some content may not be the same on your device

PIT	Linux name	mount point	partition type	block device	Description
GANG
BOOT
EFS	EFS	/efs	ext4	mmcblk0p1	modem data partition
SBL1
SBL2
PARAM
KERNEL	KERNEL	None	zImage	mmcblk0p5	boot partition, See GalaxySIIGTI9100 for more details
RECOVERY	RECOVERY	None	zImage	mmcblk0p6	recovery partition, See GalaxySIIGTI9100 for more details
CACHE
MODEM
FACTORYFS	FACTORYFS	/system	ext4	mmcblk0p9	system partition
DATAFS
UMS
HIDDEN
USERDATA	USERDATA	/data	ext4	mmcblk0p12	data partition

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.

In practice in Replicant 6.0:

• 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.