bootloader中添加emergency download mode

来源：互联网发布：golang template 编辑：程序博客网时间：2024/06/05 20:38

硬件平台：高通8x10

基线版本：QRD8x12_KK_1903411

在完成了寄存器初始化、display 设备初始化之后，系统准备开始启动，在aboot.c文件中

void aboot_init(const struct app_descriptor *app){unsigned reboot_mode = 0;bool boot_into_fastboot = false;/* Setup page size information for nand/emmc reads */if (target_is_emmc_boot()){page_size = 2048;page_mask = page_size - 1;}else{page_size = flash_page_size();page_mask = page_size - 1;}ASSERT((MEMBASE + MEMSIZE) > MEMBASE);read_device_info(&device);target_serialno((unsigned char *) sn_buf);dprintf(SPEW,"serial number: %s\n",sn_buf);memset(display_panel_buf, '\0', MAX_PANEL_BUF_SIZE);/* Check if we should do something other than booting up */<span style="color:#000099;">if (keys_get_state(KEY_VOLUMEUP) && keys_get_state(KEY_VOLUMEDOWN))   //音量上下键选择进入emergency download mode,但在此之前需要配置这两个GPIO{dprintf(ALWAYS,"dload mode key sequence detected\n");if (set_download_mode(EMERGENCY_DLOAD)){dprintf(CRITICAL,"dload mode not supported by target\n");}else{reboot_device(0);dprintf(CRITICAL,"Failed to reboot into dload mode\n");}boot_into_fastboot = true;}</span>if (!boot_into_fastboot){if (keys_get_state(KEY_HOME) || keys_get_state(KEY_VOLUMEUP))boot_into_recovery = 1;if (!boot_into_recovery &&(keys_get_state(KEY_BACK) || keys_get_state(KEY_VOLUMEDOWN)))boot_into_fastboot = true;}

在target/msm8610/init.c中配置这两个音量键

#if MSM8610_C199#define TLMM_VOL_UP_BTN_GPIO    72#define TLMM_VOL_DOWN_BTN_GPIO  73#else#define TLMM_VOL_UP_BTN_GPIO    -1#define TLMM_VOL_DOWN_BTN_GPIO  -1

/* Return 1 if vol_up pressed */static int target_volume_up(){uint8_t status = 0;gpio_tlmm_config(TLMM_VOL_UP_BTN_GPIO, 0, GPIO_INPUT, GPIO_PULL_UP, GPIO_2MA, GPIO_ENABLE);/* Wait for the configuration to complete.*/thread_sleep(1);/* Get status of GPIO */status = gpio_status(TLMM_VOL_UP_BTN_GPIO);/* Active low signal. */return !status;}/* Return 1 if vol_down pressed */uint32_t target_volume_down(){#if 1uint8_t status = 0;if(TLMM_VOL_DOWN_BTN_GPIO == -1)return 0;gpio_tlmm_config(TLMM_VOL_DOWN_BTN_GPIO, 0, GPIO_INPUT, GPIO_PULL_UP, GPIO_2MA, GPIO_ENABLE);/* Wait for the configuration to complete.*/thread_sleep(1);/* Get status of GPIO */status = gpio_status(TLMM_VOL_DOWN_BTN_GPIO);/* Active low signal. */return !status;#else/* Volume down button tied in with PMIC RESIN. */return pm8x41_resin_status();#endif}

int set_download_mode(enum dload_mode mode)   //这个函数在这个文件中是没有的，可以参考别的文件中{dload_util_write_cookie(mode == NORMAL_DLOAD ?DLOAD_MODE_ADDR : EMERGENCY_DLOAD_MODE_ADDR, mode);pm8x41_clear_pmic_watchdog();return 0;}

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