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| 1 | 2.5 Commercial release configurations | |
| 2 | Some features are intended for use only during the development and debugging stages. These features must be | |
| 3 | disabled prior to commercial release to improve performance and user experience. | |
| 4 | Disabling kernel debug feature to optimize HLOS performance | |
| 5 | By default, the kernel configuration file includes many settings that are useful during the development and | |
| 6 | debugging phase but may affect performance. | |
| 7 | To disable the default kernel debugging settings, use LINUX/android/kernel/arch/arm/configs/msm8226- | |
| 8 | perf_defconfig instead of msm8226_defconfig. | |
| 9 | Enabling Subsystem Restart (SSR) | |
| 10 | When a subsystem (mode, wifi, video core, etc.) crashes, the subsystem can be configured to automatically notify | |
| 11 | the AP. The AP then restarts the applicable subsystem. This provides a better user experience. | |
| 12 | 1. To enable subsystem restart prior to commercial release, open the | |
| 13 | android/device/qcom/msmXXXX/system.prop file. | |
| 14 | 2. Modify the persist.sys.ssr.restart_level property as follows: | |
| 15 | persist.sys.ssr.restart_level=modem,wcnss,adsp,venus or 1 | |
| 16 | This enables subsystem restart for modem, wifi, adsp, and video subsystems. This is the recommended setting | |
| 17 | for commercial release. | |
| 18 | During engineering development, this property should be set to 1 as shown below. This enables subsystem panic | |
| 19 | which is useful for engineering releases. | |
| 20 | persist.sys.ssr.restart_level=1 | |
| 21 | Subsystem panic means that when each subsystem encounters a problem which triggers a reset, the AP will catch | |
| 22 | this event and will call kernel panic. As a result, the device can enter download mode to capture ramdump. | |
| 23 | Disabling Download Mode | |
| 24 | During development and debugging, Download mode is used to get memory dump for crash analysis. For a | |
| 25 | production device, Download mode is not needed since the device should just reboot. | |
| 26 | 80-NP616-2 A | |
| 27 | 16 | |
| 28 | Confidential and Proprietary – Qualcomm Technologies, Inc. | |
| 29 | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATIONSoftware Customization Guidelines | |
| 30 | Use one of the following methods to disable download mode: | |
| 31 | | |
| 32 | Modify the arch/arm/mach-msm/restart.c file as follows: | |
| 33 | static int download_mode = 1; | |
| 34 | change 1 -> 0 | |
| 35 | Modifying the download_mode value is the preferred method because you have the ability to dynamically | |
| 36 | obtain a memory dump for a launched phone. Download mode can be enabled from the shell: | |
| 37 | echo 1 > /sys/module/restart/parameters/download_mode | |
| 38 | | |
| 39 | Remove CONFIG_MSM_DLOAD_MODE=y from | |
| 40 | LINUX/android/kernel/arch/arm/configs/msm8226_defconfig | |
| 41 | Using this method, Download mode is completely disabled. It cannot be enabled dynamically so you will not | |
| 42 | be able to switch to Download mode for image programming. | |
| 43 | If needed, Firehose can be used for image programming. QFIL (QPST 2.7 Build 416 or later) supports Firehose. | |
| 44 | QFIL uses adb reboot edl to switch to emergency download mode. |
