Replicant

h1. XMMBoot

h2.  Introduction

For both libsamsung-ipc and the Linux driver it's interesting to understand better the boot of the modem in order to come with good names for the abstraction.

|_. gpio platform data name |_. present |_. absent |_. comments |

| gpio_cp_on | | | cp == baseband processor |

| gpio_reset_req_n | |

| gpio_cp_reset | | | cp == baseband processor |

| gpio_pda_active | |

| gpio_phone_active | |

| gpio_cp_dump_int | | | cp == baseband processor |

| gpio_flm_uart_sel | Galaxy Nexus | Not used in libsamsung-ipc for other Replicant compatible devices | Modem download mode ? |

| gpio_cp_warm_reset | | |  cp == baseband processor  |

| gpio_revers_bias_clear | | | |

| gpio_revers_bias_restore | | | |

| gpio_sim_detect | | | Detect SIM card presence ? |

h2. SIM card presence detection

Do we really want to check the SIM card presence?

Would it be possible not to for privacy reasons?

Example:

* Boot a modem with a SIM

* Take away the SIM card

* Go to a protest with only the SIM card and a phone with no data on it to be able to call if necessary.

h2. TODO

* check gpio_flm_uart_sel in smdk4412 kernel too

h2. Links

* https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/drivers/misc/modem_if/modem_modemctl_device_xmm6260.c

* https://forum.xda-developers.com/galaxy-s2/help/how-to-talk-to-modem-commands-t1471241/page4