李晓刚的博客

Ubuntu22 Linux 开发环境配置

T113-S3

git.buildroot.org 全志哪吒D1开发板代码下载编译与调试(基于ubuntu22.04) 依赖安装 sudo apt install libncurses5-dev openssl libssl-dev build-essential pkg-config libc6-dev bison flex libelf-dev zlibc minizip libidn11-dev...

Posted by LXG on August 15, 2023

Android 系统定制

配置项修改

默认支持的语言列表 frameworks/base/core/res/res/values/locale_config.xml 源码 frameworks/base/core/java/com/android/internal/app/LocalePickerWithRegion.java frameworks/base/core/java/com/android/internal/...

Posted by LXG on August 15, 2023

A133 冻屏问题

android 10 内核死锁

冻屏日志-1 已经关闭app硬件加速的情况【FAQ1575】 RCU stall [ 476.654262] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 476.660702] 3-...: (1 GPs behind) idle=e89/140000000000000/0 softirq=20754/20755 fq...

Posted by LXG on August 5, 2023

Android 多网卡机制

android 12

ifconfig rk3588_s:/ $ ifconfig lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope: Host UP LOOPBACK RUNNING MTU:65...

Posted by LXG on August 3, 2023

网络基础

Android

图解互联网通信图解TCPIP 交换机由于交换机本身没有 MAC 地址，所以数量超过一定时，每台交换机维护的 MAC 地址表将会变得无法维护，事实上也无法存储这么大数据的 MAC 地址表。所以我们需要一种拥有独立 MAC 地址，帮助我们做转发的设备——路由器由此诞生路由器网关局域网的入口和出口，不同局域网之间沟通必须经过网关通俗一点的讲：网关就是要去...

Posted by LXG on August 2, 2023

A133 异常关机问题

过流

现象 21寸屏幕安卓设备偶现黑屏，黑屏时电源指示灯不亮电源检查电源适配器进来后分成了两路DC, 分别为VCC-USB, 和 VCC-SYS VCC-SYS 5.1V 3A, 顺时电流超过3A会出现过流的情况原因猜测： VCC-SYS 接风扇瞬时过流导致 VCC-LED PWR_LED: 主控的GPIO引脚控制，不亮时说明主控异常，需要检查主控供电 VCC_I...

Posted by LXG on July 17, 2023

A133 Pinctrl

Android Q(10)

A133_Datasheet_V1.4 The documentation describes features of each module, pin/signal characteristics, current consumption, the interface timing, thermal and package, and part reliability of the A13...

Posted by LXG on July 13, 2023

Android SystemUI

Android 7.1(N)

下拉栏 systemui_qspanel 架构图 SystemServer public final class SystemServer { private void startOtherServices() { mActivityManagerService.systemReady(new Runnable() { @Ov...

Posted by LXG on July 11, 2023

A133 Thermal

芯片温度控制

概念 Thermal 俗称热控制系统，其功能是通过 temperature sensor 测量当前 CPU、GPU 等设备的温度值，然后根据此温度值，影响 CPU、GPU 等设备的调频策略，对 CPU、GPU 等设备的最大频率进行限制，最终实现对 CPU、GPU 等设备温度的闭环控制，避免 SOC 温度过高。 IPA(Intelligent Power allocator) 温控策略：...

Posted by LXG on July 5, 2023

Rockchip 系统日志收集

rk3399 rk3288 rk3588

Firefly-Log 系统日志收集 android 7 开发者选项-系统日志收集器 src/com/android/settings/DevelopmentSettings.java public class DevelopmentSettings extends RestrictedSettingsFragment { private static final St...

Posted by LXG on June 27, 2023

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