XMMBoot » History » Revision 72
Revision 71 (Denis 'GNUtoo' Carikli, 03/25/2020 04:36 AM) → Revision 72/213 (Denis 'GNUtoo' Carikli, 03/25/2020 05:03 PM)
h1. XMMBoot
{{toc}}
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.
h2. Abstraction
* hci_power -> link_power
TODO:
* Find the difference between power_on and boot_power_on
** Look at the GPIOs and understand what they do
** Just read the code that use the GPIOs
** Diff both procedures
* Look which device has which XMM626X
* Add XMM6210 devices too
h2. GPIOs
h3. Devices GPIOs assignement and drivers
|_. Variant |_. SOC |_. Modem |_. GPIO usage |_. GPIO assignement |
| GT-I9300 | Exynos 4412 | XMM6262 | "CONFIG_UMTS_MODEM_XMM6262=y":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/configs/lineageos_i9300_defconfig#n1350
"Makefile":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/drivers/misc/modem_if/Makefile#n10
"modem_modemctl_device_xmm6262.c":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/drivers/misc/modem_if/modem_modemctl_device_xmm6262.c | "CONFIG_SEC_MODEM_M0=y":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/configs/lineageos_i9300_defconfig#n541
"Makefile":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/mach-exynos/Makefile#n320
"board-m0-modems.c":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/mach-exynos/board-m0-modems.c
"CONFIG_MACH_M0=y":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/configs/lineageos_i9300_defconfig#n455
"gpio-midas.h":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/mach-exynos/include/mach/gpio-midas.h#n28
"gpio-rev00-m0.h":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/mach-exynos/include/mach/gpio-rev00-m0.h |
h3. GPIOs usage
TODO: make sure to mention what applies to what device
* Start with I9300. Assume I9300 if device is not mentioned. Mention device when not I9300
* Add more devices and mention them
|_. gpio platform data name |_. present |_. absent |_. Implementation |_. comments |
| gpio_cp_on | | | | powers on the modem? in which state (PMIC?, CPU?)
* On GT-I9100 it's connected to the ON1 modem pin and ON2 is not connected. |
| gpio_cp_reset | | | | Resets the modem CPU? PMIC?:
* "''check the reset timming with C2C connection''":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/drivers/misc/modem_if/modem_modemctl_device_xmm6262.c#n106 : Here C2C probably means chip to chip
Can also read the modem CPU? and/or PMIC? reset state?
* "Reads from the GPIO and ''CP not ready, Active State low'' comment":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/mach-exynos/board-m0-modems.c#n287 |
| gpio_reset_req_n | | | |
| gpio_pda_active | | | | Tell the modem if the SOC CPUs are sleeping/active or not?
* "PDA == Application processor":https://android.stackexchange.com/questions/176515/what-do-the-terms-bl-ap-cp-and-csc-mean-in-odin
* "''PDA_ACTIVE, let cp know AP sleep'' comment in status gc1-gpio.c":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/mach-exynos/gc1-gpio.c#n213
* "PDA_ACTIVE set to 0 right after cpu_pm_enter()":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/mach-exynos/cpuidle-exynos4.c#n701
* "PDA_ACTIVE set to 1 right before cpu_pm_exit()":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/arch/arm/mach-exynos/cpuidle-exynos4.c#n796
* GPIO direction is output on AP side and input on BP side, which is also confirmed by the "pinout table in XDA":https://forum.xda-developers.com/galaxy-s2/help/how-to-talk-to-modem-commands-t1471241/page4 |
| gpio_phone_active | | | | |
| gpio_cp_dump_int | | | | cp: baseband processor |
| gpio_flm_uart_sel |\2. Only used for the Galaxy Nexus in libsamsung-ipc | | 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 ? |
h3. Libsamsung-ipc
|/2. ioctl / function |\6. Devices |
| GT-I9250 (maguro) | GT-I9100 | GT-I9300 | GT-N5100 | GT-N7100 | GT-P3100 / GT-P5100 (piranah) |
| open, close, read, write
fmt/rfs
gprs
power |\6. Yes |
| boot_power
status_online_wait | Yes |\5. No |
| hci_power
link_control_enable
link_control_active
link_control_wait
link_get_hostwake_wait | No |\4. Yes | No |
TODO:
* Don't use abbreviated function names
h3. libsamsung-ipc <-> kernel functions <-> gpios
|_. libsamsung-ipc |_\3. Kernel |
|_. Function using the ioctl |_. ioctl name |_. function pointer name |_. GPIO used |
| xmm626_kernel_smdk4412_power | IOCTL_MODEM_ON
IOCTL_MODEM_OFF | modem_on
modem_off | gpio_cp_on
gpio_cp_reset
gpio_reset_req_n
gpio_pda_active |
| | | | gpio_phone_active |
| | | | gpio_cp_dump_int |
| xmm626_kernel_smdk4412_boot_power | IOCTL_MODEM_BOOT_ON
IOCTL_MODEM_BOOT_OFF | modem_boot_on
modem_boot_off | gpio_flm_uart_sel |
| | | | gpio_cp_warm_reset |
| | | | gpio_revers_bias_clear |
| | | | gpio_revers_bias_restore |
| | | | gpio_sim_detect |
h3. Glossary
Terms for the modem CPU: modem:
* BP: Baseband processor
* CP: Cellular? processor
Term for the CPU of the system on a chip running Replicant:
* AP: Application processor
TODO: move in its own page and point to it
h3. 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.
h3. TODO
* check gpio_flm_uart_sel in smdk4412 kernel too
h2. Modem partitions
h3. GT-I9300, GT-N7100
|_. Location |_. Name |_. Content |
| [ 0x0 -> 0xfff ] | ? | Partition table ? |
| [ 0x1000 -> 0xefff ] | PSIRAM | First stage bootloader ? |
| [ 0xF000 -> 0x27fff ] | EBL | Second stage bootloader ? |
| [ 0x28000 -> 0x9ff7ff ] | MAIN | ? |
| [ 0x9ff800 -> 0x9fffff ] | SECPACK | ? |
| [ 0xa00000 -> 0xbfffff ] | NV | nvdata default values?
TODO: find the place in libsamsung-ipc source mentioning that |
References for the table:
* https://git.replicant.us/replicant/external_libsamsung-ipc/tree/samsung-ipc/devices/i9300/i9300.h?id=9ff9785a7f48e32f107ca7fb2e298b1320ad4cbc
* https://git.replicant.us/replicant/external_libsamsung-ipc/tree/samsung-ipc/devices/n7100/n7100.h?id=9ff9785a7f48e32f107ca7fb2e298b1320ad4cbc
* Verified on GT-I9300 and GT-N7100 modem partition table
h4. GT-I9300 and GT-N7100 modem partition table dump
TODO:
* Send patch for the "modem-partition-tool#n33":https://git.replicant.us/contrib/GNUtoo/hardware_replicant_libsamsung-ipc/tree/tools/modem-image-tool.c?h=patches-todo/modem-partition-tool#n33
* Make sure that we know the device from the command line
* Understand the field depths along the way when supporting more devices
* Document all other devices that don't have this partition table
* Find the name of this partition table
<pre>
$ hexdump -C RADIO.img
00000000 50 53 49 52 41 4d 00 00 00 00 00 00 00 10 00 00 |PSIRAM..........|
00000010 00 00 00 00 00 e0 00 00 00 00 00 00 00 00 00 00 |................|
00000020 45 42 4c 00 00 00 00 00 00 00 00 00 00 f0 00 00 |EBL.............|
00000030 00 00 00 60 00 90 01 00 00 00 00 00 00 00 00 00 |...`............|
00000040 4d 41 49 4e 00 00 00 00 00 00 00 00 00 80 02 00 |MAIN............|
00000050 00 00 30 60 00 78 9d 00 00 00 00 00 00 00 00 00 |..0`.x..........|
00000060 53 45 43 50 41 43 4b 00 00 00 00 00 00 f8 9f 00 |SECPACK.........|
00000070 00 00 00 00 00 08 00 00 00 00 00 00 00 00 00 00 |................|
00000080 4e 56 00 00 00 00 00 00 00 00 00 00 00 00 a0 00 |NV..............|
00000090 00 00 e8 60 00 00 20 00 00 00 00 00 00 00 00 00 |...`.. .........|
000000a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
[...]
</pre>
h3. Devices without a partition table or with a different one
* GT-I9100, GT-I9250, GT-N7000, GT-P3100
* Probably GT-P5100 as well, as it's similar to GT-P3100
* All the devices with Qualcomm modems (GT-I9305, GT-N7105)
Unknown:
* Galaxy Note 8.0
h2. Links
* "modem_modemctl_device_xmm6262.c":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/drivers/misc/modem_if/modem_modemctl_device_xmm6262.c
* https://forum.xda-developers.com/galaxy-s2/help/how-to-talk-to-modem-commands-t1471241/page4
* http://www.arteris.com/blog/bid/59433/Interchip-Connectivity-HSIC-UniPro-HSI-C2C-LLI-oh-my
** TODO: move this link somewhere where it's more useful