Project

General

Profile

PortingToAndroid10 » History » Version 275

dl lud, 06/29/2020 11:51 AM
Move TEMPORARY_DISABLE_PATH_RESTRICTIONS=true to "Fixing the build environment".

1 264 dl lud
h1. Porting Replicant to Android 10
2 1 Denis 'GNUtoo' Carikli
3 101 Denis 'GNUtoo' Carikli
{{>toc}}
4 1 Denis 'GNUtoo' Carikli
5 266 dl lud
Active development has moved towards LineageOS 17 (based on Android 10).
6 1 Denis 'GNUtoo' Carikli
7 267 dl lud
The basic features working on Replicant 9 have been confirmed to work on Replicant 10, but not everything has been tested yet on either version. Replicant 9 source code and build instruction have been kept to do regression tracking: [[DeprecatedPortingToAndroid9|Porting Replicant to Android 9]].
8
9 266 dl lud
h2. Building Replicant 10
10 256 Denis 'GNUtoo' Carikli
11 266 dl lud
h3. Source code
12 256 Denis 'GNUtoo' Carikli
13
<pre>
14 262 Denis 'GNUtoo' Carikli
$ repo init -u https://git.replicant.us/replicant-9/manifest.git -b replicant-10-dev
15 256 Denis 'GNUtoo' Carikli
$ repo sync
16
</pre>
17
18
Alternatively a shallow copy of the source tree can be fetched in order to save on disk space:
19
20
<pre>
21 262 Denis 'GNUtoo' Carikli
$ repo init -u https://git.replicant.us/replicant-9/manifest.git -b replicant-10-dev --depth=1
22 256 Denis 'GNUtoo' Carikli
$ repo sync -c
23 1 Denis 'GNUtoo' Carikli
</pre>
24 256 Denis 'GNUtoo' Carikli
25 269 dl lud
To unshallow a specific module:
26 256 Denis 'GNUtoo' Carikli
27
<pre>
28
$ cd path/to/module
29 1 Denis 'GNUtoo' Carikli
$ git fetch --unshallow <remote>
30 256 Denis 'GNUtoo' Carikli
</pre>
31 1 Denis 'GNUtoo' Carikli
32 267 dl lud
h3. Build dependencies
33 256 Denis 'GNUtoo' Carikli
34 267 dl lud
h4. For Trisquel 8
35
36 256 Denis 'GNUtoo' Carikli
<pre>
37 1 Denis 'GNUtoo' Carikli
sudo apt-get install bc bison build-essential bsdmainutils ccache curl flex g++-multilib gcc-multilib gettext git gnupg gperf imagemagick lib32ncurses5-dev lib32readline-dev lib32z1-dev liblz4-tool libncurses5-dev libsdl1.2-dev libssl-dev libwxgtk3.0-dev libxml2 libxml2-utils lzop python-mako pngcrush rsync schedtool squashfs-tools xsltproc zip zlib1g-dev
38 256 Denis 'GNUtoo' Carikli
sudo apt-get install gcc-5-arm-linux-gnueabi
39 1 Denis 'GNUtoo' Carikli
</pre>
40
41 267 dl lud
h3. Fixing the build environment
42 256 Denis 'GNUtoo' Carikli
43 274 dl lud
h4. Allow system binaries for building
44
45
By default, the Android 10 build system can only use the prebuilt binaries it ships. However, in Replicant's path to freedom, we would like to use the system binaries instead. Setting the following envrionment variable allows that:
46
47
<pre>
48
$ export TEMPORARY_DISABLE_PATH_RESTRICTIONS=true
49
</pre>
50
51
Note that setting this variable does not automatically make the build system use the system binaries, it just allows it. Prebuilts are still being used now. Lots of further effort must be put into transitioning to the system binaries.
52
53 267 dl lud
h4. Certificates
54
55 260 Denis 'GNUtoo' Carikli
Not 100% sure if this is still needed:
56 256 Denis 'GNUtoo' Carikli
<pre>
57
$ subject='/C=US/ST=California/L=Mountain View/O=Android/OU=Android/CN=Android/emailAddress=android@android.com'
58
$ mkdir .android-certs
59
$ for x in releasekey platform shared media testkey; do \
60 1 Denis 'GNUtoo' Carikli
  ./development/tools/make_key .android-certs/$x "$subject"; \
61
  done
62 256 Denis 'GNUtoo' Carikli
</pre>
63
64 273 dl lud
h4. Mako (Python) for Mesa
65 267 dl lud
66 260 Denis 'GNUtoo' Carikli
To avoid the following error:
67
<pre>
68
16:20:13 See https://android.googlesource.com/platform/build/+/master/Changes.md#PATH_Tools for more information.
69
[  3% 2585/70375] build out/target/product/i9305/gen/STATIC_LIBRARIES/libmesa_nir_intermediates/nir/nir_builder_opcodes.h
70
FAILED: out/target/product/i9305/gen/STATIC_LIBRARIES/libmesa_nir_intermediates/nir/nir_builder_opcodes.h
71
/bin/bash -c "python external/mesa3d/src/compiler/nir/nir_builder_opcodes_h.py external/mesa3d/src/compiler/nir/nir_opcodes.py > out/target/product/i9305/gen/STATIC_LIBRARIES/libmesa_nir_intermediates/nir/nir_builder_opcodes.h"
72
Traceback (most recent call last):
73
  File "external/mesa3d/src/compiler/nir/nir_builder_opcodes_h.py", line 106, in <module>
74
    from mako.template import Template
75
ImportError: No module named mako.template
76
16:20:20 ninja failed with: exit status 1
77
</pre>
78
79
You need to run the following command:
80 1 Denis 'GNUtoo' Carikli
<pre>
81
$ cd prebuilts/build-tools/path/linux-x86/
82
$ rm python && ln -s /usr/bin/python python
83 260 Denis 'GNUtoo' Carikli
</pre>
84
85 270 dl lud
h4. Java heap space
86
87
The Java heap size is automatically set according to the available system memory. On machines with 8 GB or less RAM, it is set to a value which is too low, and will result in the following error during the build:
88
89
<pre>
90
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
91
</pre>
92
93
The heap size can be "increased with an envirnoment variable":https://stackoverflow.com/a/60474592/1313087:
94
95
<pre>
96
$ export _JAVA_OPTIONS="-Xmx4g"
97
</pre>
98
99 267 dl lud
h3. Launching the build
100
101 256 Denis 'GNUtoo' Carikli
<pre>
102 1 Denis 'GNUtoo' Carikli
$ source build/envsetup.sh
103
$ lunch lineage_i9305-eng
104 265 dl lud
$ make bacon
105 256 Denis 'GNUtoo' Carikli
</pre>
106
107 266 dl lud
h3. Install the images
108 256 Denis 'GNUtoo' Carikli
109 268 dl lud
<pre>
110 271 dl lud
$ cd out/target/product/i9305/obj/PACKAGING/target_files_intermediates/lineage_i9305-target_files-eng.<username>/IMAGES
111
$ sudo heimdall flash --BOOT boot.img --USERDATA userdata.img --SYSTEM system.img 
112 268 dl lud
</pre>
113 256 Denis 'GNUtoo' Carikli
114 266 dl lud
h3. Get adb
115 256 Denis 'GNUtoo' Carikli
116
As the device IDs are the ones given by the Linux kernel, they are not in the adb udev rules, so for now it requires to run adb as root:
117
<pre>
118
$ sudo adb shell
119
* daemon not running; starting now at tcp:5037
120
* daemon started successfully
121
i9305:/ #                                 
122 1 Denis 'GNUtoo' Carikli
$ sudo adb kill-server
123
$ adb shell
124
* daemon not running; starting now at tcp:5037
125
* daemon started successfully
126
error: no devices/emulators found
127
</pre>
128
So make sure to kill the adb-server and run it as root:
129
<pre>
130
$ adb kill-server
131
$ sudo adb shell
132
* daemon not running; starting now at tcp:5037
133
* daemon started successfully
134
i9305:/ # 
135 256 Denis 'GNUtoo' Carikli
</pre>
136
137 272 dl lud
h3. Boot progress
138
139
You can also follow the boot progress with adb:
140
<pre>
141
adb logcat
142
adb logcat -b main
143
</pre>
144
145
Note that the device can go into suspend at any time, so adb might be interrupted. That looks like that:
146
First you get a shell
147
<pre>
148
$ sudo adb shell
149
i9305:/ #
150
</pre>
151
152
Then the connection is interrupted:
153
<pre>
154
$ adb shell
155
i9305:/ # [randomdev@fullyfreelaptop ]$                                                                                                     
156
</pre>
157
158
The effect with adb logcat is similar.
159
160 269 dl lud
h3. Getting the latest changes
161
162
* The repositories are being constantly modified with @git push --force@ as we are trying things out, and don't want to make the commits history look too dirty, so be sure to backup your local changes.
163
* Sometimes the manifest repository is also modified with @git push --force@. In that case the following commands will loose all the work you did locally but will make the repository consistent with upstream repositories again:
164
<pre>
165
$ rm -rf .repo/manifests/ # This enables me to force push and rebase the manifest repository as well
166
$ repo init -u https://git.replicant.us/replicant-9/manifest.git -b replicant-10-dev
167
$ repo sync --force-sync
168
</pre>
169
* The following command might also be necessary to make the state consistent with upstream repositories again, when the manifest history wasn't rewritten, but it will also loose all the work you did locally: 
170
<pre>
171
$ repo sync --force-sync
172
</pre>
173 199 Kurtis Hanna
174 267 dl lud
h3. Build VM
175 199 Kurtis Hanna
176
If you use Parabola, you may be interested in running Trisquel 8 in LXC.
177
178
To do that first debootstrap a Trisquel 8 rootfs. 
179
180
Parabola's debootstrap does support Trisquel 8 and its manual has an example on how to do that:
181
<pre>
182
$ man debootstrap
183
[...]
184
# debootstrap flidas flidas-root http://archive.trisquel.info/trisquel
185
</pre>
186 1 Denis 'GNUtoo' Carikli
187
Then you can use virt-manager to setup the LXC instance.
188 199 Kurtis Hanna
189
The advantages of this solution are that:
190
* The LXC guest and host shares their resources (CPU, RAM) with almost no penalty
191
* Trisquel 8 is not a rolling release distribution
192
193
The disadvantage of this solution are that:
194 267 dl lud
* you need to configure the Trisquel 8 LXC instance (vimrc, sshd_config, etc)
195 199 Kurtis Hanna
* It's more complicated to setup
196 267 dl lud
* The Android build system outputs a warning message about not being able to use namespaces which may become mandatory in newer Android versions
197 272 dl lud
198
h2. cleanups to be done
199
200
* Make adb work as user by using the right USB IDs, and make userspace do the USB setup.
201
* -Make the kernel not use hardcoded CMDLINE_FORCE- Not possible unless the bootloader is changed or Linux is very heavily patched.
202
* Make the kernel not use hardcoded partitions if possible (though we use system as root)
203
* Make a clean Gatekeeper HAL module implementation instead of using the same hack than goldfish
204
* Look at "init.rc":https://android.googlesource.com/platform/system/core/+/master/init/README.md documentation to see if init.rc can be overriden clearly with the override statement to see if it's possible to keep the serial console patch for -eng
205 172 Joonas Kylmälä
206 153 Denis 'GNUtoo' Carikli
h2. Upstreaming status
207
208 261 Denis 'GNUtoo' Carikli
* The stock bootloader is incompatible with Linux, see [[BootloadersIncompatibleWithLinux#Devices-with-the-Exynos-4412]] for more information. So we maintain patches to enable the Galaxy SIII, and Galaxy Note II to boot with the stock bootloader. In the long run we need to look into using u-boot in the kernel partition as using u-boot instead of the stock bootloader currently require nonfree and non-redistributable software (BL1).
209
* For the patches that are not merged yet, see the "issues of the redmine upstreaming sub-project":https://redmine.replicant.us/projects/upstreaming/issues
210 153 Denis 'GNUtoo' Carikli
211 227 Denis 'GNUtoo' Carikli
h2. Modem status
212
213 228 Denis 'GNUtoo' Carikli
*libsamsung-ipc:* 
214
* Fully tested under GNU/Linux only
215 235 Denis 'GNUtoo' Carikli
* Can initialize completely the modem and receive messages (see the #1954 bug report for the logs)
216 228 Denis 'GNUtoo' Carikli
* Needs more cleanup but there is now a better abstraction
217 229 Denis 'GNUtoo' Carikli
218 228 Denis 'GNUtoo' Carikli
*libsamsung-ril:* 
219
* Ported to Replicant 9 using a wrapper for the API >=12 in libsamsung-ril source code that needs to be removed
220
* Tested under Replicant 9 without up to date libsamsung-ipc (no modem init)
221
* Tested and validated under Replicant 6 (doesn't break telephony)
222
223
h3. Modem status TODO
224
225 227 Denis 'GNUtoo' Carikli
* Implement the missing part to shut down the modem, close the interfaces and such, in order to need to reboot after each test.
226
* Continue to clean up the libsamsung-ipc and libsamsung-ril patches, test the patches in Replicant 6 when applicable, and merge them in the upstream repositories.
227
* Convert the firmware loading driver to the upstream API and then adapt libsamsung-ipc for that. This should also benefit other devices like the Galaxy SIII 4G, and the Galaxy Note II 4G which probably don't need much more to get their modem supported by upstream Linux.
228
* Cleanup and convert the rest of the drivers to look like the ones for the Nokia N900 and adapt the userspace in libsamsung-ipc, and merge libsamsung-ipc support for that once the kernel API is stable.
229
* Test the code under Replicant 9 when the graphics status will enable to have decent enough speed to do some testing through human interaction.
230
231 87 Denis 'GNUtoo' Carikli
h2. TODO
232 51 Denis 'GNUtoo' Carikli
233 74 Denis 'GNUtoo' Carikli
First month of full time equivalent work:
234 81 Denis 'GNUtoo' Carikli
235 127 Denis 'GNUtoo' Carikli
|_. Time estimation  |_.Task |_. Comments |
236
| DONE | -boot a device under AOSP9- | Only boots with graphics, not much more |
237
| -7h- DONE | -build it under a "FSDG compliant distribution":https://www.gnu.org/distros/free-distros.html like Trisquel8- | -WIP for AOSP, It's difficult to do precise time estimations as it could work out of the box or require one full time month of work depending on how much issues are encountered- 
238 59 Denis 'GNUtoo' Carikli
Builds under Trisquel8|
239 213 Denis 'GNUtoo' Carikli
| -21h- DONE | * -port the changes from AOSP9 to LineageOS 16-
240 155 Denis 'GNUtoo' Carikli
* -cleanup the code-
241 151 Joonas Kylmälä
* -build the kernel from the Android build system-
242 125 Denis 'GNUtoo' Carikli
* -make sure it builds with an FSDG compliant distribution-
243 143 Denis 'GNUtoo' Carikli
* -document the build procedure- |
244
Status:
245 155 Denis 'GNUtoo' Carikli
* Boots with adb.
246 143 Denis 'GNUtoo' Carikli
* Has ultra slow graphics |
247 127 Denis 'GNUtoo' Carikli
| 14h | find, remove and document proprietary software in LineageOS 16 | |
248
| 21h | find, remove and document privacy issues in LineageOS 16 | |
249 241 Denis 'GNUtoo' Carikli
| 7h | -Add support for the touch keys driver in the  galaxy-s3 dts- | "applied":https://lists.infradead.org/pipermail/linux-arm-kernel/2019-November/694100.html |
250 240 Denis 'GNUtoo' Carikli
| 7h | -upstream the AAT1290 flash led Linux dts for the galaxy-s3 boards- | "Now in 5.3":https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.3&id=4e4dfcb2a425cccc6dd1fb7d46e060cd57999afc |
251 127 Denis 'GNUtoo' Carikli
| 7h | rebrand LineageOS as Replicant | |
252 234 Denis 'GNUtoo' Carikli
| 70h | -port and- cleanup the the Galaxy SIII (i9300) "modem":https://github.com/fourkbomb/linux/tree/modem Linux driver from 4.16 to 5.0| See the [[PortingToAndroid9/#Modem-status|modem status]] for more details |
253 127 Denis 'GNUtoo' Carikli
|_\3. Total: 147h (~1 month) |
254 95 Denis 'GNUtoo' Carikli
255 1 Denis 'GNUtoo' Carikli
Second month of full time equivalent work:
256 216 Denis 'GNUtoo' Carikli
| * port  libsamsung-ril and libsamsung-ipc to Android 9
257 234 Denis 'GNUtoo' Carikli
* Make the modem driver and libsamsung-ipc work together | 157h | See the [[PortingToAndroid9/#Modem-status|modem status]] for more details |
258 1 Denis 'GNUtoo' Carikli
|_. Total |_. 157h | ~1 month |
259
260
Third month of full time equivalent work:
261
|_. Task |_. Time estimation |_. Comments |
262 213 Denis 'GNUtoo' Carikli
| -port the sensors libraries and other device specific libraries-
263
Look which sensor libraries can be used | 70h | Already done by the unofficial LineageOS port of the Galaxy SIII (i9300), needs testing |
264 255 Denis 'GNUtoo' Carikli
| add support for Audio with the upstream kernel driver | 70h | Might be way faster, depending on what Android 9 uses
265
                                                               See also "this bugreport":https://github.com/CustomROMs/android_local_manifests_i9300/issues/1 |
266 212 Denis 'GNUtoo' Carikli
| -add partial (no modem) support for the Galaxy SIII 4G (i9305) and- factorize the code with i9300 | 14h | * The source code on which the work was based changed from AOSP to an unofficial LineageOS port to a port of i9305 support for AOSP by Joonas to the official LineageOS so it's now supported by default
267
* The work to factorize the code between the i9300 and i9305 still need to be done |
268
 |
269 1 Denis 'GNUtoo' Carikli
|_. Total |_. 154h | ~1 month |
270 67 Denis 'GNUtoo' Carikli
271 71 Denis 'GNUtoo' Carikli
|_. Task |_. Time estimation |_. Comments |
272 96 Denis 'GNUtoo' Carikli
| create a recovery | 21h | |
273 74 Denis 'GNUtoo' Carikli
| add internal WiFi support and validate the functionality | 6h | |
274 71 Denis 'GNUtoo' Carikli
| add external WiFi dongles support | 20h | External dongles support might be tricky |
275 125 Denis 'GNUtoo' Carikli
| -create new- update the install and upgrade instructions | -35h- | -Our current install instructions don't scale as we have one copy for each device.-
276
-We also created generic instructions but they tend to be harder to follow[1] than the device specific ones.-
277
-This will be made in a modular format (for instance in LaTeX) that enables to generate per device install instructions without requiring to have multiples copy of the same text.-
278 214 Denis 'GNUtoo' Carikli
-The instructions will need to be able to be modified and compiled on an FSDG compliant distribution.-
279
Mostly done: 
280
* The installation instructions are now generic enough. 
281
* Some long standing TODO were also done along the way like adding backup instructions for the EFS.
282
* The current instructions are still for Replicant 6.0 and will need to be updated for Replicant 9.0 |
283 92 Denis 'GNUtoo' Carikli
284 71 Denis 'GNUtoo' Carikli
|_. Task |_. Time estimation |_. Comments |
285
| Estimate the amount of work to Reduce the attack surface | ? | |
286 1 Denis 'GNUtoo' Carikli
| Estimate the amount of work to add in-system upgrades | ? | |
287
288 82 Denis 'GNUtoo' Carikli
fn1. The generic instructions were tested at Install parties in Paris 
289 1 Denis 'GNUtoo' Carikli
290 85 Denis 'GNUtoo' Carikli
h3. Devices support:
291 1 Denis 'GNUtoo' Carikli
292 77 Denis 'GNUtoo' Carikli
h4. Easy, because it's similar enough to the Galaxy SIII (I9300)
293 97 Denis 'GNUtoo' Carikli
294
|_\3. Galaxy Note II (N7100) |
295 94 Denis 'GNUtoo' Carikli
|_. Task |_. Time estimation |_. Comments |
296 86 Denis 'GNUtoo' Carikli
| port the EA8061 LCD Linux driver | 35h | |
297
| port the S6EVR02 LCD Linux driver | 35h | |
298
| port the MAX77693 flash led Linux driver | 7h | |
299
| android: add support for the Note II (N7100) and factorize the code with Galaxy SIII (i9300) and Galaxy SIII 4G (i9305) | 14h | Should be similar to the Galaxy SIII |
300
| port the sensors libraries and other device specific libraries | 70h | It's difficult to evaluate how much time it could take |
301 125 Denis 'GNUtoo' Carikli
| add support for Audio with the upstream kernel driver | 14h | Should be similar to the Galaxy SIII |
302 86 Denis 'GNUtoo' Carikli
303 1 Denis 'GNUtoo' Carikli
|_\3. Galaxy Note 8.0 (N5100) and 8.0 WiFi (N5110) |
304 70 Denis 'GNUtoo' Carikli
|_. Task |_. Time estimation |_. Comments |
305
| Evaluate the time required to do the port | 14h | TODO |
306 69 Denis 'GNUtoo' Carikli
307 94 Denis 'GNUtoo' Carikli
h4. Needs more work and unknown upstream Linux status
308
309 54 Denis 'GNUtoo' Carikli
|_. Device |_. Time estimation |_. Comments |
310
| Galaxy S II (i9100) | | Linux: devboard dts upstream? unknown status |
311
| Galaxy Note (N7000) | | unknown Linux upstream status |
312 254 Jens Korte
| Galaxy Nexus (I9250) | |/2. OMAP4, no dts upstream |
313 34 Denis 'GNUtoo' Carikli
| Galaxy Tab 2 7.0 (P3100), 7.0 WiFi (P3110), 10.1 (P5100), 10.1 WiFi (P5110) | |
314 2 Denis 'GNUtoo' Carikli
| GTA04 >= A4 | | TODO: a RIL needs to be written, userspace GPS support is missing, audio scenarios, etc |
315 4 Denis 'GNUtoo' Carikli
316 128 Denis 'GNUtoo' Carikli
h2. Documentation
317 1 Denis 'GNUtoo' Carikli
318 128 Denis 'GNUtoo' Carikli
h3. Replicant 6.0 changes
319
320 252 Denis 'GNUtoo' Carikli
See [[Replican6Changes]].
321 128 Denis 'GNUtoo' Carikli
322 193 Denis 'GNUtoo' Carikli
h3. Other rebases
323
324 253 Denis 'GNUtoo' Carikli
See the [[Samsung-ipc]] page.
325 193 Denis 'GNUtoo' Carikli
326 217 Denis 'GNUtoo' Carikli
h2. Other attempts
327
328 218 Denis 'GNUtoo' Carikli
* It might be interesting to contact the people doing ports once we have something working well enough.
329
* It is also interesting to look at other attempts to understand if a given device is powerful enough to run Android 9 and what configuration was used to achieve it.
330
331 217 Denis 'GNUtoo' Carikli
|_. Device(s) |_. Repository |_. status |_. Comments |
332 238 Kurtis Hanna
| i9300 | "CustomROMs":https://github.com/CustomROMs/android_local_manifests_i9300 | * "March 3 2019 release":https://forum.xda-developers.com/galaxy-s3/development/rom-lineageos-16-0-t3875899 | |
333
| i9300 | "Team InFusion":https://github.com/team-infusion-developers/android_local_manifests_i9300 | * "August 20 2019 release":https://forum.xda-developers.com/galaxy-s3/development/rom-optimized-lineageos-16-0-team-t3940142 | Issues: * Uses a Samsung kernel
334
* Uses too many nonfree libraries
335 237 Kurtis Hanna
=> Probably nothing we could reuse from its code |
336
| N7100 | "ComicoTeam":https://github.com/ComicoTeam/android_device_samsung_n7100 | * "September 13 2019 release":https://forum.xda-developers.com/galaxy-note-2/development/rom-lineageos-16-0-20190112-comico-t3889281 | |
337 236 Kurtis Hanna
| I9100 | | "XDA":https://forum.xda-developers.com/galaxy-s2/development-derivatives/pie-i9100-t3850588 | |
338 217 Denis 'GNUtoo' Carikli
339 220 Denis 'GNUtoo' Carikli
h3. Links for other attempts
340
341
* https://www.xda-developers.com/android-pie-android-9-port-custom-roms/
342
343 128 Denis 'GNUtoo' Carikli
h3. CustomROMs i9300 components
344
345 131 Denis 'GNUtoo' Carikli
|_. Repository |_. Tree path |_. Dependencies |_. Function |_. Comments |
346
|/8. https://github.com/CustomROMs/android_hardware_samsung
347
lineage-16.0 branch | hardware/samsung/macloader | | Loads the MAC Address of the WiFi network interface | Might be useful |
348
| hardware/samsung/wifiloader | | Loads the wifi kernel module (like modprobe) and setup firmware filesystems permissions | May be useful |
349
| hardware/samsung/audio | | seems to contains ril related stuff as well | Look if the ril stuff is required, go for standard audio |
350
| hardware/samsung/lineagehw/hidl/livedisplay | | livedisplay is a feature similar to what redshift does on GNU/Linux | Not sure if it works with mainline |
351
| hardware/samsung/exynos/multimedia/utils/ | seem meant for audio/video decoding offload | assembly obtimized color conversion and resize code | check assembly code license, not sure if useful |
352
| all other directories in hardware/samsung/exynos/ | nonfree firmwares, nonfree software?, smdk kernel? | audio/video decoding offload | Avoid using that |
353
| hardware/samsung/exynos3 |/2. nonfree firmwares?, nonfree software?, smdk kernel? |/2. some light libraries, display stuff (gralloc, etc), 2D acceleration (FIMG), camera (FIMC), 3D acceleration, etc |/2. Avoid using that for now |
354 202 Kurtis Hanna
| hardware/samsung/exynos4 |
355 1 Denis 'GNUtoo' Carikli
356
h2. Links 
357 205 dl lud
358
* "Android build requirements - hardware and software":https://source.android.com/setup/build/requirements
359
* "Why LineageOS Developers are building Android Go-optimized custom ROMs":https://www.xda-developers.com/android-go-old-android-8-1-oreo/
360
* "Android Go recommended default values for propreties for optimization":https://android.googlesource.com/platform/build/+/master/target/product/go_defaults_common.mk
361
* "Team InFusion i9300 optimized system.prop":https://github.com/team-infusion-developers/android_device_samsung_i9300/blob/lineage-16.0/system.prop#L23
362
* "Hack to fix high CPU usage caused by logd":https://github.com/team-infusion-developers/android_device_samsung_smdk4412-common/commit/c66015514fc9779edfed2665f67e841f3620c71e
363
* "Use low-end video codecs":https://github.com/team-infusion-developers/android_device_samsung_smdk4412-common/commit/adc919f04b981a4fe005fab2cf443596a22992b2
364
* "Optimize ActivityManager cached apps":https://github.com/team-infusion-developers/android_device_samsung_smdk4412-common/commit/24bc62970d35eb5a7a257463e7dbfe873ceb5779
365
* "Use 1Gb Dalvik config":https://github.com/team-infusion-developers/android_device_samsung_smdk4412-common/commit/8a7cebc5af772a2949420ac4a383f5f75236c65c