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CellularModem » ModemProtocols » Samsung-ipc »

XMMBoot » History » Version 26

Denis 'GNUtoo' Carikli, 03/16/2020 03:45 AM

1 1 Denis 'GNUtoo' Carikli 
h1. XMMBoot
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h2.  Introduction





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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.





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h2. GPIOs





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The GPIO platform data names were taken from the "modem_modemctl_device_xmm6260.c":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/drivers/misc/modem_if/modem_modemctl_device_xmm6260.c file





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|_. ioctl name |_. function pointer name |_. gpio platform data name |_. present |_. absent |_. comments |





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| | | gpio_cp_on | | | cp == baseband processor |





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| | | gpio_reset_req_n | |





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| | | gpio_cp_reset | | | cp == baseband processor |





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| | | gpio_pda_active | |





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| | | gpio_phone_active | |





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| | | gpio_cp_dump_int | | | cp == baseband processor |





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| IOCTL_MODEM_BOOT_ON





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IOCTL_MODEM_BOOT_OFF | modem_boot_on





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





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| | | gpio_cp_warm_reset | | |  cp == baseband processor  |





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| | | gpio_revers_bias_clear | | | |





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| | | gpio_revers_bias_restore | | | |





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| | | gpio_sim_detect | | | Detect SIM card presence ? |





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h3. SIM card presence detection





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Do we really want to check the SIM card presence?





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Would it be possible not to for privacy reasons?





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Example:





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* Boot a modem with a SIM





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* Take away the SIM card





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





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h3. TODO





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* check gpio_flm_uart_sel in smdk4412 kernel too





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h2. Modem partitions





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h3. GT-I9300





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|_. Location |_. Name |_. Content |





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| [ 0x0 -> 0xfff ] | ? | Partition table? |





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| "[ 0x1000 -> 0xefff]":https://git.replicant.us/replicant/external_libsamsung-ipc/tree/samsung-ipc/devices/i9300/i9300.h?id=9ff9785a7f48e32f107ca7fb2e298b1320ad4cbc#n24 | PSIRAM | First stage bootloader? |





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| "[ 0xF000 -> 0x27fff ]":https://git.replicant.us/replicant/external_libsamsung-ipc/tree/samsung-ipc/devices/i9300/i9300.h?id=9ff9785a7f48e32f107ca7fb2e298b1320ad4cbc#n26 | EBL | Second stage bootloader ? |





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h4. Partition table ?





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<pre>





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$ hexdump -C RADIO.img





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00000000  50 53 49 52 41 4d 00 00  00 00 00 00 00 10 00 00  |PSIRAM..........|





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00000010  00 00 00 00 00 e0 00 00  00 00 00 00 00 00 00 00  |................|





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00000020  45 42 4c 00 00 00 00 00  00 00 00 00 00 f0 00 00  |EBL.............|





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00000030  00 00 00 60 00 90 01 00  00 00 00 00 00 00 00 00  |...`............|





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00000040  4d 41 49 4e 00 00 00 00  00 00 00 00 00 80 02 00  |MAIN............|





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00000050  00 00 30 60 00 78 9d 00  00 00 00 00 00 00 00 00  |..0`.x..........|





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00000060  53 45 43 50 41 43 4b 00  00 00 00 00 00 f8 9f 00  |SECPACK.........|





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00000070  00 00 00 00 00 08 00 00  00 00 00 00 00 00 00 00  |................|





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00000080  4e 56 00 00 00 00 00 00  00 00 00 00 00 00 a0 00  |NV..............|





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00000090  00 00 e8 60 00 00 20 00  00 00 00 00 00 00 00 00  |...`.. .........|





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000000a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|





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*





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[...]





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</pre>





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h2. Links





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





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