Targets Evaluation¶

Evaluation criteria¶

Minimal requirements¶

List of the bare minimum requirements for a device to be ported to Replicant:

• The device must be supported by CyanogenMod officially (better) or via 3rd party repos
• There must be a way to flash images (via bootloader or recovery) using a free program
• The kernel must not be signed: the bootloader must not check the kernel signature
• The kernel sources must have been released
• The network type must be GSM, no CDMA phone can be supported for now

Good target¶

What makes a good target for Replicant:

• Bootloader must be ready to flash images, or be very easy to unlock
• Free user-space implementation for most of the hardware already available
• Standard or well-known protocols used in the hardware (V4L2/ALSA/NMEA, etc)
• Firmwares needed only for WiFi/Bluetooth, and not sound, screen, touchscreen, camera, etc
• Freedom-compliant hardware design: Modem isolation (no shared mem, GPS, audio)

Ideal target¶

An ideal target for Replicant would be:

• Free bootloaders that allow easy flashing for the user
• All the hardware using standard protocols, kernel-drivers and no user-space binary blobs
• Components that do not require loadable firmware
• Ways to update the internal firmwares of the chips (for instance to allow a free software modem implementation)
• Total modem isolation (doesn't control audio, nor GPS, mem, NAND, etc)
• SIM unlock

Known to be bad targets¶

Here is a list of the bad targets for Replicant and reasons why:

• MSM/QSD devices are known to have bad hardware design where the modem controls GPS, audio (including mic), RAM, NAND.
  However, some MSM/QSD SoCs don't ship with a modem embedded, so they may be good targets.
• Nvidia Tegra 2 devices are known to be too slow with Replicant, since there is no NEON nor any free hwcomposer/gralloc.
  Perhaps newer Tegra SoCs (which include NEON) would be faster on Replicant.
• Motorola devices manufactured after the Milestone (inclusive). These have non-free locked bootloaders that check kernel signatures. sbf_flash, a utility capable of flashing Motorola devices, is non-free.

Devices evaluation¶

Android devices¶

Device	Manufacturer	CyanogenMod port	Flash method	SoC	Graphics	Sound	Modem	WiFi/Bluetooth	Camera	GPS	Sensors	Notes	Freedom Issues
One	GeeksPhone	CM 7.2 (Android 2.3)	Recovery	MSM7K	Should be fast	Should work	Non-standard protocol but AT seems possible, bad design for freedom	WiFi is not the same as GTA02 and requires firmwares	MSM undocumented mechanism	Probably NMEA from modem, bad design for freedom	?	PaulK has one	Qualcomm => Hardware is BAD for freedom
Zero	GeeksPhone	CM 7.2 (Android 2.3)	Fastboot	MSM7227	Should be fast	May need firmwares	?	Need firmwares	MSM undocumented mechanism	Probably NMEA from modem, bad design for freedom	?		Qualcomm => Hardware is BAD for freedom
Galaxy Tab 8.9	Samsung	CM 9.0 (Android 4.0)	Heimdall/Recovery	Tegra 4	?	Free module	Samsung IPC, XMM6260	Need firmwares	Non-free tegra module, perhaps not even v4l2	BCM4751: secret protocol	?	PaulK had one but failed to port to it because of Tegra slowness issues.	?
Nexus 7	Asus	CM 10 (Android 4.1)	Fastboot	Tegra 4	?	Free module	3G version modem uses AT	Need firmwares	Non-free tegra module, perhaps not even v4l2	BCM4751: secret protocol	?		?
Nexus 10	Samsung	?	Fastboot	Exynos 5250	Free gralloc, hwcomposer, non-free 3d, beware: ultra high resolution(could be slow)	Free module	N/A (Has No Modem)	Need firmwares	Free module	BCM4751: secret protocol	Free module		?
Nexus 4	LG	CM 10.1 (Android 4.2)	Fastboot	Qualcomm Snapdragon S4 Pro APQ8064	?	?	Unknown protocol	Need firmware	?	?	?	?	Really BAD: has too much proprietary things and the hardware is bad for freedom: modem transport is over HSIC (high speed USB), but it controls the GPS (included in the modem chip), audio and perhaps NAND too
Defy	Motorola	CM 7.2 (Android 2.3)	Recovery, in-system recovery flash	OMAP 3630	Should work	?	?	?	Non-free	?	?	Bootloader is locked	Kernel is signed, making a Replicant port impossible

Other devices¶

Device	Manufacturer	Android port	Bootloader	SoC	Standardness	Blobs	Firmwares	Modem	Notes
Neo Freerunner	Openmoko	AoF	u-boot, flash with dfu-utils	Samsung S3C2442, CPU @400Mhz	Audio: ALSA, GPS: NMEA, Modem: AT	No	No	Total isolation	Hardware is too old to be support by Replicant, armv4t
N900	Nokia	Nitdroid	partially signed, chainloaded u-boot, flash with 0xff	OMAP3430, CPU @600Mhz	Voice calls depend on cmt_speech pulseaudio plugin, modem protocol is non-standard but implemented in ofono	Nitdroid uses blobs	Nitdroid uses firmwares (WiFi, bluetooth, camera)	GPS is controlled by the modem, modem transport is over high-speed serial	GNUtoo has one, Nitdroid is hard to build and undocumented
iPhone	Apple	iDroid	iDroid bootloader seems free	iPhone 3G: Similar to Samsung S5PC110	iPhone 3G: Audio: ALSA, Modem: AT, WiFi: libertas	Probably needs some	Probably needs some	Known to never sleep	already supported by the Idroid project ,however it has a really bad status : it can't suspend to ram...
FLOW G1.55	GizmoForYou	Stock	xloader + u-boot	OMAP3	Audio: ALSA, Modem: AT	?	WiFi/Bluetooth	Needs to be check, could be OK	Instructions to build Android 2.2 for it are provided: http://www.gizmoforyou.net/wiki/index.php/Building_G155_Android Unfortunately that phone isn’t cheap.
PengPod1000/700	PengPod	? Android development forum	u-boot	Allwinner A10	?	both 8192cu and rtl8188eu WiFi chips need firmware blob	Some have rtl8192cu WiFi, some have rtl8188eu	N/A	More focused on running GNU/Linux than Android. Wiki

There is a small number of Do-it-yourself phones where the user is expected to assemble his phone. Examples of this include the odroid phones with comes with android support.
However the issue is that not all users wants or are able to assemble their own phones.