XMMBoot¶

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.

GPIOs¶

The GPIO platform data names were taken from the modem_modemctl_device_xmm6260.c file

ioctl name	function pointer name	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
IOCTL_MODEM_BOOT_ON IOCTL_MODEM_BOOT_OFF	modem_boot_on modem_boot_off	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 ?

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.

TODO¶

• check gpio_flm_uart_sel in smdk4412 kernel too

Modem partitions¶

GT-I9300¶

Links¶

• modem_modemctl_device_xmm6260.c
• https://forum.xda-developers.com/galaxy-s2/help/how-to-talk-to-modem-commands-t1471241/page4