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tisenxu

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展讯平台一个由于printf函数引起的正常关机后无法正常开机故障原因分析与解决

分类： Android平台

2014-03-17 15:03:04

前段时间再开发一个展讯平台的android智能机项目，系统测试发现手机正常关机后第二天早上来长按POWER键无法开机，后来验证电池电压为2.1v, 此电压无法正常开机（关机前电池说与充满状态），但是还有另外一台机器也无法开机，测量电压也为3.9V，此机器重新拔掉电池后就能正常开机。以上故障机器手机中都没有这只自动开机和关机闹钟相关功能。

以上面的显现来判断，大致怀疑是手机在关机后又自动重启，但是在重启过程中没有重启成功，并以死机状态一直保持耗并最终电池电压降到无法维持正常开机电压。

基于以上的现象和大致分析，初步怀疑系统在boot过程中出现异常而导致死机。于是在平台的bootloader部分（展讯平台使用u-boot）打开uart log，进行复现问题并通过UART抓取log分析。

在不断的尝试后终于复现故障，并且在相连的稳压源上看到复现故障的时候手机端出现140MA大电流并保持，从此显现判定为异常机器死机。以下是通过uart log分析结果

1）正常关机后再起来大电流导致按电源键无法再开机问题原因分析：

         正常关机后手机收到了ANA_RTC_INT_RSTS，启动uboot后做了alarm_flag_check动作，在alarm_flag_check（）函数中做了如下动作（文件位置u-boot/property/alarm_mode.c  u-boot/property/cmd_cboot.c）:

a)u-boot启动代码中会check种种开机原因，其中需要check是否是alarm开机方式

点击(此处)折叠或打开

  1. int do_cboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  2. {
  3.     uint32_t key_mode = 0;
  4.     uint32_t key_code = 0;
  5.     volatile int i;

  7.     if(argc > 2)
  8.       goto usage;

  10. #ifdef CONFIG_AUTOBOOT
  11.     normal_mode();
  12. #endif

  14.     boot_pwr_check();
  15.     
  16. #ifdef CONFIG_SC8800G
  17.     CHG_ShutDown();
  18.     if(charger_connected()){
  19.         mdelay(10);
  20.         CHG_TurnOn();
  21.     }else{
  22.         if(is_bat_low()){
  23.             printf("shut down again for low battery\n");
  24.             power_down_devices();
  25.             while(1)
  26.               ;
  27.         }
  28.     }
  29. #else
  30.     CHG_Init();
  31. #ifndef CONFIG_MACH_CORI
  32.     if(is_bat_low()){
  33.                 printf("shut down again for low battery\n");
  34.                 mdelay(10000);
  35.                 power_down_devices();
  36.                 while(1)
  37.                  ;
  38.     }
  39. #endif
  40. #endif    

  42.     boot_pwr_check();
  43.     board_keypad_init();
  44. #if defined (CONFIG_SP8825C1)
  45.     hw_reboot_init();
  46. #endif
  47.     boot_pwr_check();

  49.     int recovery_init(void);
  50.     int ret =0;
  51.     ret = recovery_init();
  52.     if(ret == 1){
  53.         DBG("func: %s line: %d\n", __func__, __LINE__);
  54.         recovery_mode_without_update();
  55.     }else if(ret == 2){
  56.      try_update_modem(); //update img from mmc
  57.      normal_mode();
  58.     }

  60.     unsigned check_reboot_mode(void);
  61.     unsigned rst_mode= check_reboot_mode();
  62.     if(rst_mode == RECOVERY_MODE){
  63.         DBG("func: %s line: %d\n", __func__, __LINE__);
  64.         recovery_mode();
  65.     }
  66.     else if(rst_mode == FASTBOOT_MODE){
  67.         DBG("func: %s line: %d\n", __func__, __LINE__);
  68.         fastboot_mode();
  69.     }else if(rst_mode == NORMAL_MODE){
  70.         normal_mode();
  71.     }else if(rst_mode == WATCHDOG_REBOOT){
  72.         watchdog_mode();
  73. #if defined (CONFIG_SP8825C1)
  74.     }else if(rst_mode == HWREBOOT_MODE){
  75.         hwreboot_mode();
  76. #endif
  77.     }else if(rst_mode == UNKNOW_REBOOT_MODE){
  78.         unknow_reboot_mode();
  79.     }else if(rst_mode == PANIC_REBOOT){
  80.         panic_reboot_mode();
  81.     }else if(rst_mode == ALARM_MODE){
  82.               int flag =alarm_flag_check();
  83.               if(flag == 1)
  84.             alarm_mode();
  85.               else if(flag == 2)
  86.             normal_mode();
  87.     }else if(rst_mode == SLEEP_MODE){
  88.         sleep_mode();
  89.     }else if(rst_mode == SPECIAL_MODE){
  90.         special_mode();
  91.     }
  92. #ifdef CONFIG_SC8810
  93. // normal_mode();
  94. #endif
  95.     DBG("func: %s line: %d\n", __func__, __LINE__);

  97.    if(charger_connected()){
  98.         DBG("%s: charger connected\n", __FUNCTION__);

  100. #if defined (CONFIG_SP8825C1)
  101.     calibration_detect(1);
  102. #endif

  104.         charge_mode();
  105.     }
  106.     //find the power up trigger
  107.     else if(boot_pwr_check() >= get_pwr_key_cnt()){
  108.         DBG("%s: power button press\n", __FUNCTION__);
  109.     DBG("boot_pwr_check=%d,get_pwr_key_cnt=%d\n",boot_pwr_check(),get_pwr_key_cnt());
  110.         //go on to check other keys
  111.         mdelay(50);
  112.         for(i=0; i<10;i++){
  113.             key_code = board_key_scan();
  114.             if(key_code != KEY_RESERVED)
  115.               break;
  116.         }
  117.         DBG("key_code %d\n", key_code);
  118.         key_mode = check_key_boot(key_code);

  120.         switch(key_mode){
  121.             case BOOT_FASTBOOT:
  122.                 fastboot_mode();
  123.                 break;
  124.             case BOOT_RECOVERY:
  125.                 recovery_mode();
  126.                 break;
  127.             case BOOT_CALIBRATE:
  128.                 engtest_mode();
  129.                 return 0; //back to normal boot
  130.                 break;
  131.             case BOOT_DLOADER:
  132.                 dloader_mode();
  133.                 break;
  134.             default:
  135.                 break;
  136.         }
  137.     }
  138.     else if(alarm_triggered() && alarm_flag_check()){
  139.         DBG("%s: alarm triggered\n", __FUNCTION__);
  140.         int flag =alarm_flag_check(); //此处判断是否是闹钟
  141.         if(flag == 1)
  142.         alarm_mode();
  143.         else if(flag == 2)
  144.               normal_mode();
  145.     }else{
  146. #if BOOT_NATIVE_LINUX_MODEM
  147.         *(volatile u32*)CALIBRATION_FLAG = 0xca;
  148. #endif

  150. #ifndef CONFIG_SP8825C1
  151.         calibration_detect(0);
  152. #endif

  154.         //if calibrate success, it will here
  155.         DBG("%s: power done again\n", __FUNCTION__);
  156.         power_down_devices();
  157.         while(1)
  158.           ;
  159.     }

  161.     if(argc == 1){
  162.     DBG("func: %s line: %d\n", __func__, __LINE__);
  163.         normal_mode();
  164.         return 1;
  165.     }

  167.     if(argc == 2){
  168.         DBG("func: %s line: %d\n", __func__, __LINE__);

  170.         if(strcmp(argv[1],"normal") == 0){
  171.             normal_mode();
  172.             return 1;
  173.         }
  174.         DBG("func: %s line: %d\n", __func__, __LINE__);

  176.         if(strcmp(argv[1],"recovery") == 0){
  177.             recovery_mode();
  178.             return 1;
  179.         }
  180.         DBG("func: %s line: %d\n", __func__, __LINE__);

  182.         if(strcmp(argv[1],"fastboot") == 0){
  183.             fastboot_mode();
  184.             return 1;
  185.         }
  186.         DBG("func: %s line: %d\n", __func__, __LINE__);

  188.         if(strcmp(argv[1],"dloader") == 0){
  189.             dloader_mode();
  190.             return 1;
  191.         }
  192.         DBG("func: %s line: %d\n", __func__, __LINE__);

  194.         if(strcmp(argv[1],"charge") == 0){
  195.             charge_mode();
  196.             return 1;
  197.         }
  198.         DBG("func: %s line: %d\n", __func__, __LINE__);

  200.         if(strcmp(argv[1],"caliberation") == 0){
  201.             calibration_detect(1);
  202.             return 1;
  203.         }
  204.         DBG("func: %s line: %d\n", __func__, __LINE__);
  205.     }
  206.     DBG("func: %s line: %d\n", __func__, __LINE__);

  208. usage:
  209.     cmd_usage(cmdtp);
  210.     return 1;
  211. }

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  1. int alarm_flag_check(void)
  2. {

  4.     int ret = -1,ret1 = -1;
  5.     long time = 0;
  6.     long time1 = 0;
  7.     unsigned long time_rtc= 0;
  8.     unsigned long time_rtc1= 0;
  9.     unsigned long now_rtc = 0;
  10.     int time_lead = 0;

  12.     block_dev_desc_t *p_block_dev = NULL;

  14.     int factoryalarmret1 = 1, factoryalarmret2 = 1,factorypowerret1 = 1, factorypowerret2 = 1;
  15.     unsigned long factoryalarmcnt1, factoryalarmcnt2,factorypowercnt1, factorypowercnt2;
  16.     unsigned char factoryalarmarray1[PRODUCTINFO_SIZE + EMMC_SECTOR_SIZE];
  17.     unsigned char factoryalarmarray2[PRODUCTINFO_SIZE + EMMC_SECTOR_SIZE];
  18.     unsigned char factorypowerarray1[PRODUCTINFO_SIZE + EMMC_SECTOR_SIZE];
  19.     unsigned char factorypowerarray2[PRODUCTINFO_SIZE + EMMC_SECTOR_SIZE];
  20.     
  21.     p_block_dev = get_dev("mmc", 1);
  22.     if(NULL == p_block_dev)
  23.         ret = 0;
  24.     if (ret == -1) {
  25.         memset((unsigned char *)factoryalarmarray1, 0xff, PRODUCTINFO_SIZE + EMMC_SECTOR_SIZE);
  26.         factoryalarmret1 = prodinfo_read_partition(p_block_dev, PARTITION_PROD_INFO1, 8 * 1024, (char *)factoryalarmarray1, PRODUCTINFO_SIZE + 8);
  27.         memset((unsigned char *)factoryalarmarray2, 0xff, PRODUCTINFO_SIZE + EMMC_SECTOR_SIZE);
  28.         factoryalarmret2 = prodinfo_read_partition(p_block_dev, PARTITION_PROD_INFO2, 8 * 1024, (char *)factoryalarmarray2, PRODUCTINFO_SIZE + 8);

  30.         memset((unsigned char *)factorypowerarray1, 0xff, PRODUCTINFO_SIZE + EMMC_SECTOR_SIZE);
  31.         factorypowerret1 = prodinfo_read_partition(p_block_dev, PARTITION_PROD_INFO1, 12 * 1024, (char *)factorypowerarray1, PRODUCTINFO_SIZE + 8);
  32.         memset((unsigned char *)factorypowerarray2, 0xff, PRODUCTINFO_SIZE + EMMC_SECTOR_SIZE);
  33.         factorypowerret2 = prodinfo_read_partition(p_block_dev, PARTITION_PROD_INFO2, 12 * 1024, (char *)factorypowerarray2, PRODUCTINFO_SIZE + 8);
  34.     }

  36.     if ((factoryalarmret1 == 0) && (factoryalarmret2 == 0)) {
  37.         factoryalarmcnt1 = char2u32(factoryalarmarray1, 3 * 1024 + 4);
  38.         factoryalarmcnt2 = char2u32(factoryalarmarray2, 3 * 1024 + 4);
  39.         if (factoryalarmcnt2 >= factoryalarmcnt1)
  40.             ret = move2timebuf(factoryalarmarray2, (unsigned char *)time_buf);
  41.         else
  42.             ret = move2timebuf(factoryalarmarray1, (unsigned char *)time_buf);
  43.     } else if ((factoryalarmret1 == 0) && (factoryalarmret2 == 1)) {
  44.         ret = move2timebuf(factoryalarmarray1, (unsigned char *)time_buf);
  45.     } else if ((factoryalarmret1 == 1) && (factoryalarmret2 == 0)) {
  46.         ret = move2timebuf(factoryalarmarray2, (unsigned char *)time_buf);
  47.     } else if ((factoryalarmret1 == 1) && (factoryalarmret2 == 1)) {
  48.         printf("alarm_flag are all empty or wrong\n");
  49.         ret = -1;
  50.     }
  51.     if(ret > 0){
  52.         printf("file: alarm_flag exist\n");    
  53.         printf("time get %s", time_buf);
  54.         time = simple_strtol(time_buf, NULL, 10);
  55.         time_rtc = time;
  56.     }
  57.     if ((factorypowerret1 == 0) && (factorypowerret2 == 0)) {
  58.         factorypowercnt1 = char2u32(factorypowerarray1, 3 * 1024 + 4);
  59.         factorypowercnt2 = char2u32(factorypowerarray2, 3 * 1024 + 4);
  60.         if (factorypowercnt2 >= factorypowercnt1)
  61.             ret1 = move2timebuf(factorypowerarray2, (unsigned char *)time_buf1);
  62.         else
  63.             ret1 = move2timebuf(factorypowerarray1, (unsigned char *)time_buf1);
  64.     } else if ((factorypowerret1 == 0) && (factorypowerret2 == 1)) {
  65.         ret1 = move2timebuf(factorypowerarray1, (unsigned char *)time_buf1);
  66.     } else if ((factorypowerret1 == 1) && (factorypowerret2 == 0)) {
  67.         ret1 = move2timebuf(factorypowerarray2, (unsigned char *)time_buf1);
  68.     } else if ((factorypowerret1 == 1) && (factorypowerret2 == 1)) {
  69.         printf("poweron_timeinmillis are all empty or wrong\n");
  70.         ret1 = -1;
  71.     }

  73.     if(ret1 > 0){
  74.         printf("file: poweron_timeinmillis exist\n");     
  75.         printf("time get %s", time_buf1);
  76.         time1 = simple_strtol(time_buf1, NULL, 10);
  77.         time_rtc1 = time1;
  78.     }
  79.     sprd_rtc_init();
  80.     now_rtc = sprd_rtc_get_sec();
  81.     printf("now rtc %lu\n", now_rtc);
  82.     time_lead = get_alarm_lead_set();
  83.     time = time - now_rtc;
  84.     time1 = time1 - now_rtc;
  85.     if((time < time_lead +180) && (time > time_lead -10))
  86.     {
  87.         if((time1 < time_lead +180) && (time1 > time_lead -10)&& (time -time1>50))
  88.             ret = 2;
  89.         else
  90.             ret = 1;
  91.     }
  92.     else if((time1 < time_lead +180) && (time1 > time_lead -10))
  93.         ret =2;
  94.     else{
  95.         if (ret == -1&& ret1== -1) {
  96.             printf("file: all not found\n");
  97.         }else if(ret1== -1){
  98.             uboot_rtc_set_alarm_sec(time_rtc);
  99.         }else if(ret== -1){
  100.             uboot_rtc_set_alarm_sec(time_rtc1);
  101.         }else{
  102.             if(time_rtc1 > time_rtc){
  103.                 uboot_rtc_set_alarm_sec(time_rtc);
  104.             }else{
  105.                 uboot_rtc_set_alarm_sec(time_rtc1);
  106.             }
  107.         }
  108.         ret = 0;
  109.     }

  111.     return ret;
  112. }
如上面的alarm_flag_check()函数中有如下代码


    if (ret == -1) {

                   memset((unsigned char *)factoryalarmarray1, 0xff, PRODUCTINFO_SIZE +  EMMC_SECTOR_SIZE);

                   factoryalarmret1 = prodinfo_read_partition(p_block_dev, PARTITION_PROD_INFO1, 8 * 1024, (char *)factoryalarmarray1, PRODUCTINFO_SIZE + 8);

                   memset((unsigned char *)factoryalarmarray2, 0xff, PRODUCTINFO_SIZE +  EMMC_SECTOR_SIZE);

                   factoryalarmret2 = prodinfo_read_partition(p_block_dev, PARTITION_PROD_INFO2, 8 * 1024, (char *)factoryalarmarray2, PRODUCTINFO_SIZE + 8);

         }

b)

         然后通过move2timebuf(factoryalarmarray2, (unsigned char *)time_buf);将factoryalarmarray2中的数据放入到time_buf中，由于factoryalarmarray2中的数据全部是oxFF，直接导致time_buf[200]中200个字节的数据全部为0Xff, 这些数据可以从附件今天复现问题抓取Log中打印time_buf看出来。 


点击(此处)折叠或打开

  1. U-Boot 2010.12-svn (Oct 19 2013 - 14:03:13)



  5. DRAM: 256 MiB

  7. NAND: 00 00 00 00 00

  9. No NAND device

  11. 0 MiB

  13. Using default environment



  17. [sc8810fb_probe]

  19. [lcdc_mcu_init] LCDC_CTRL: 0x13

  21. [lcdc_calc_lcm_timing] ahb_clk: 0xfa

  23. [lcdc_calc_lcm_timing] ahb_clk: 0xfa

  25. [lcdc_lcm_configure] LCM_CTRL: 0x11600

  27. [lcdc_update_lcm_timing] LCM_PARAMETER1: 0x4ff0398

  29. [lcdc_calc_lcm_timing] ahb_clk: 0xfa

  31. [lcdc_calc_lcm_timing] ahb_clk: 0xfa

  33. [lcdc_lcm_configure] LCM_CTRL: 0x11600

  35. [lcdc_update_lcm_timing] LCM_PARAMETER1: 0x4ff0398

  37. [set_lcdc_layers] LCDC_OSD1_CTRL: 0x12d

  39. [set_lcdc_layers] LCDC_OSD1_ALPHA: 0xff

  41. [set_lcdc_layers] LCDC_OSD1_SIZE_XY: 0x1e00140

  43. [set_lcdc_layers] LCDC_OSD1_DISP_XY: 0x0

  45. [set_lcdc_layers] LCDC_OSD1_PITCH: 0x140

  47. [set_lcdsize] LCDC_DISP_SIZE: 0x1e00140

  49. [set_lcmrect] LCDC_LCM_START: 0x0

  51. [set_lcmrect] LCDC_LCM_SIZE: 0x1e00140

  53. In: serial

  55. Out: serial

  57. Err: serial

  59. sci_efuse_calibration data:0

  61. is_bat_low adc_value:843,comp_vbat:3500

  63. mingwei uboot vol:3814,adc4200:928,adc3600:796

  65. GEN0 1d382360

  67. func: do_cboot line: 101

  69. Device nand0 not

  71. mtdparts init error 1

  73. ANA_RTC_INT_RSTS is 0x820000b4

  75. value of it 0x11

  77. alarm_flag_check factoryalarmret1 = 0,factoryalarmret2=0alarm_flag file is exist

  79. time_buf[0]=255

  81. time_buf[1]=255

  83. time_buf[2]=255

  85. time_buf[3]=255

  87. time_buf[4]=255

  89. time_buf[5]=255

  91. time_buf[6]=255

  93. time_buf[7]=255

  95. time_buf[8]=255

  97. time_buf[9]=255

  99. time_buf[10]=255

  101. time_buf[11]=255

  103. time_buf[12]=255

  105. time_buf[13]=255

  107. time_buf[14]=255

  109. time_buf[15]=255

  111. time_buf[16]=255

  113. time_buf[17]=255

  115. time_buf[18]=255

  117. time_buf[19]=255

  119. time_buf[20]=255

  121. time_buf[21]=255

  123. time_buf[22]=255

  125. time_buf[23]=255

  127. time_buf[24]=255

  129. time_buf[25]=255

  131. time_buf[26]=255

  133. time_buf[27]=255

  135. time_buf[28]=255

  137. time_buf[29]=255

  139. time_buf[30]=255

  141. time_buf[31]=255

  143. time_buf[32]=255

  145. time_buf[33]=255

  147. time_buf[34]=255

  149. time_buf[35]=255

  151. time_buf[36]=255

  153. time_buf[37]=255

  155. time_buf[38]=255

  157. time_buf[39]=255

  159. time_buf[40]=255

  161. time_buf[41]=255

  163. time_buf[42]=255

  165. time_buf[43]=255

  167. time_buf[44]=255

  169. time_buf[45]=255

  171. time_buf[46]=255

  173. time_buf[47]=255

  175. time_buf[48]=255

  177. time_buf[49]=255

  179. time_buf[50]=255

  181. time_buf[51]=255

  183. time_buf[52]=255

  185. time_buf[53]=255

  187. time_buf[54]=255

  189. time_buf[55]=255

  191. time_buf[56]=255

  193. time_buf[57]=255

  195. time_buf[58]=255

  197. time_buf[59]=255

  199. time_buf[60]=255

  201. time_buf[61]=255

  203. time_buf[62]=255

  205. time_buf[63]=255

  207. time_buf[64]=255

  209. time_buf[65]=255

  211. time_buf[66]=255

  213. time_buf[67]=255

  215. time_buf[68]=255

  217. time_buf[69]=255

  219. time_buf[70]=255

  221. time_buf[71]=255

  223. time_buf[72]=255

  225. time_buf[73]=255

  227. time_buf[74]=255

  229. time_buf[75]=255

  231. time_buf[76]=255

  233. time_buf[77]=255

  235. time_buf[78]=255

  237. time_buf[79]=255

  239. time_buf[80]=255

  241. time_buf[81]=255

  243. time_buf[82]=255

  245. time_buf[83]=255

  247. time_buf[84]=255

  249. time_buf[85]=255

  251. time_buf[86]=255

  253. time_buf[87]=255

  255. time_buf[88]=255

  257. time_buf[89]=255

  259. time_buf[90]=255

  261. time_buf[91]=255

  263. time_buf[92]=255

  265. time_buf[93]=255

  267. time_buf[94]=255

  269. time_buf[95]=255

  271. time_buf[96]=255

  273. time_buf[97]=255

  275. time_buf[98]=255

  277. time_buf[99]=255

  279. time_buf[100]=255

  281. time_buf[101]=255

  283. time_buf[102]=255

  285. time_buf[103]=255

  287. time_buf[104]=255

  289. time_buf[105]=255

  291. time_buf[106]=255

  293. time_buf[107]=255

  295. time_buf[108]=255

  297. time_buf[109]=255

  299. time_buf[110]=255

  301. time_buf[111]=255

  303. time_buf[112]=255

  305. time_buf[113]=255

  307. time_buf[114]=255

  309. time_buf[115]=255

  311. time_buf[116]=255

  313. time_buf[117]=255

  315. time_buf[118]=255

  317. time_buf[119]=255

  319. time_buf[120]=255

  321. time_buf[121]=255

  323. time_buf[122]=255

  325. time_buf[123]=255

  327. time_buf[124]=255

  329. time_buf[125]=255

  331. time_buf[126]=255

  333. time_buf[127]=255

  335. time_buf[128]=255

  337. time_buf[129]=255

  339. time_buf[130]=255

  341. time_buf[131]=255

  343. time_buf[132]=255

  345. time_buf[133]=255

  347. time_buf[134]=255

  349. time_buf[135]=255

  351. time_buf[136]=255

  353. time_buf[137]=255

  355. time_buf[138]=255

  357. time_buf[139]=255

  359. time_buf[140]=255

  361. time_buf[141]=255

  363. time_buf[142]=255

  365. time_buf[143]=255

  367. time_buf[144]=255

  369. time_buf[145]=255

  371. time_buf[146]=255

  373. time_buf[147]=255

  375. time_buf[148]=255

  377. time_buf[149]=255

  379. time_buf[150]=255

  381. time_buf[151]=255

  383. time_buf[152]=255

  385. time_buf[153]=255

  387. time_buf[154]=255

  389. time_buf[155]=255

  391. time_buf[156]=255

  393. time_buf[157]=255

  395. time_buf[158]=255

  397. time_buf[159]=255

  399. time_buf[160]=255

  401. time_buf[161]=255

  403. time_buf[162]=255

  405. time_buf[163]=255

  407. time_buf[164]=255

  409. time_buf[165]=255

  411. time_buf[166]=255

  413. time_buf[167]=255

  415. time_buf[168]=255

  417. time_buf[169]=255

  419. time_buf[170]=255

  421. time_buf[171]=255

  423. time_buf[172]=255

  425. time_buf[173]=255

  427. time_buf[174]=255

  429. time_buf[175]=255

  431. time_buf[176]=255

  433. time_buf[177]=255

  435. time_buf[178]=255

  437. time_buf[179]=255

  439. time_buf[180]=255

  441. time_buf[181]=255

  443. time_buf[182]=255

  445. time_buf[183]=255

  447. time_buf[184]=255

  449. time_buf[185]=255

  451. time_buf[186]=255

  453. time_buf[187]=255

  455. time_buf[188]=255

  457. time_buf[189]=255

  459. time_buf[190]=255

  461. time_buf[191]=255

  463. time_buf[192]=255

  465. time_buf[193]=255

  467. time_buf[194]=255

  469. time_buf[195]=255

  471. time_buf[196]=255

  473. time_buf[197]=255

  475. time_buf[198]=255

  477. time_buf[199]=255

  479. alarm_flag_check,sprd_rtc_init() enter

  481. sprd_rtc_get_sec insprd_rtc_get_sec,sec=20 get_sec() oksprd_rtc_get_sec,min=39 get_min() oksprd_rtc_get_sec,hour=6 get_hour() okspr_rtc_get_sec,day=292 get_day() ok sprd_rtc_get_sec insprd_rtc_get_sec,sec=20 get_sec() oksprd_rtc_get_sec,min=39 get_min() oksprd_rtc_get_sec,hour=6 get_hour() okspr_rtc_get_sec,day=292 get_day() ok now rtc 25252760

  483. usb calibrate detecting

  485. usb calibrate configuration timeout

  487. do_cboot: power done again


c)

         然后

         if (ret == -1) {

        printf("alarm_flag file is  not found\n");

        ret = 0;

    } else {

        printf("alarm_flag file is exist\n");

        printf("time get %s", time_buf); //通过该函数将time_buf中的数据打印出来，问题就是出在这里导致手机一直处于140MA的电流不下去，其实是printf出现问题，很明显printf函数的time_buf[200]全部都是0xFF,没有作为字符串的结束符的“\0”。

 

         解决问题途径：

在printf("time get %s", time_buf);语句之前，直接将time_buf最后加入"\0"结束符。

 

         直接将printf("time get %s", time_buf);语句取消，或者直接将time_buf[199]=0;加在printf("time get %s", time_buf);前面就可以了  或者将前面a)中代码给factoryalarmarray1/ factoryalarmarray2赋值为0而不是0XFF

 

2）正常关机后偶现电流再起来，但是过一段时间后电流又重新回到0，再按电源键也能开机。但是为什么关机电流降到0后，有时候还会再有起来又降下去的情况？也就是为什么会上来ANA_RTC_INT_RSTS，仍然没有查出原因，不解决该问题，仍然会留有后患。从do_cboot()函数中打印的log可以产出出现ANA_RTC_INT_RSTS时开机原因rst_mode并不是ALARM_MODE,所以可以判定不是因为设置了alarm关机后再由于alarm时间到而触发开机。

 

3）问题2）复现概率比较高的操作条件：正常开机，设置一个闹钟，闹钟时间到响铃后关闭闹钟（或者选择延时再响，等到再响铃的时候后关闭闹钟），然后正常关机，等待关机电流到0后再起来到120ma左右然后又降到0的现象

 

 

遗留隐患问题：

2）中提到的问题，正常关机电流到0后，为什么过一段时间还会有电流起来然后又降到0的动作，也就是查明ANA_RTC_INT_RSTS（value = 0x11）上来的原因,如何触发的，这还需要深入研究

 

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