CellularModem » History » Revision 8
Revision 7 (Denis 'GNUtoo' Carikli, 02/15/2020 12:46 AM) → Revision 8/26 (Denis 'GNUtoo' Carikli, 02/15/2020 01:00 AM)
h1. CellularModem
If you are new to modems, or to the hardware and software architecture used in smartphones and tablets, it's a good idea to start from the "freedom-privacy-security-issues article":https://replicant.us/freedom-privacy-security-issues.php .
Once this is done, there are more documentation on various aspects of the Cellular modem, from the protocol to implementations details.
* [[BackupTheEFS]]: The EFS is a partition that contains modem data like the IMEI. If that partition is lost or corrupted, the modem doesn't work anymore, so be sure to backup it.
* [[QMI]]: This modem protocol is used at least in the [[GalaxyS3I9305|Galaxy S 3 4G (GT-I9305)]] and the [[GalaxyNote2N7105|Galaxy Note II 4G (GT-N7105)]]. These devices need an implementation of the [[QMI]] protocol to add support for them in Replicant.
** [[QMI-RIL]]: An attempt to implement the [[QMI]] protocol. The code can initialize the modem.
** [[oFono-RIL]] also has an implementation of the [[QMI]] protocol that can be used on Replicant. This is now the route chosen by the Replicant project.
* [[Samsung-ipc]]: This modem protocol is used in all the smartphones (and some of the tablets) supported by Replicant.
** [[libsamsung-ipc]]: The library that implements the [[Samsung-ipc]] protocol.
** [[libsamsung-ril]]: The library that interfaces [[libsamsung-ipc]] with Android.
** [[ModemDisable]]: Documentation on how to disable the modem. Currently applies to devices with the [[Samsung-ipc]]. This is needed because the flight mode doesn't disable the modem at all.
** [[SamsungGalaxyBackdoor]]: A backdoor found in the nonfree Samsung implementation of the samsung-ipc protocol.
** [[SIMnotRecognized]]: A bug in libsamsung-ipc that affected Replicant 6.0, which resulted in SIM cards not being recognized.
** [[OtherModemProtocols]]: A list of other modem protocols and their implementations
TODO: This list child pages but it doesn't have any explanation of the pages
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