MTK nvram介绍

1. 开机后，加载nvram，围绕nvram_daemon.c中main函数进行

代码：

alps/vendor/mediatek/proprietary/external/libnvram/nvram_daemon/nvram_daemon.c

1）152  int main(void) {
153     intiMaxLidNum = 0;
154     intret_callback = -1;
155
156     iMaxLidNum = NVM_Init();--NVM_Init只在开机阶段init一次，init完成后会置init flag为1，后面过程就不再重复进行init，以免消耗资源
157     NVRAM_LOG("Total nvram Lid number is %d\n", iMaxLidNum);
158     umask(000);
159     if (iMaxLidNum <= 0) {
160         NVRAM_LOG("Total nvram Lid number is error !!!\n");
161         exit(EXIT_FAILURE);
162     }
163
164     if (nvram_emmc_support() || nvram_ufs_support()) {
165         if (!Check_UpdateStatus()) {
166             NVRAM_LOG("fail to check upgrade status in first boot\n");
167         }
168     }
169  #ifdef MTK_NVRAM_AUTO_BACKUP
170     if (!FileOp_CmpBackupFileNum()) {
171         FileOp_BackupToBinRegion_All();
172         FileOp_SetCleanBootFlag(true);
173     } else {
174  #endif
175         if (!FileOp_RecoveryData())
176             //if(!FileOp_RestoreFromBinRegionForDM())
177         {
178             NVRAM_LOG("Bin Region Restore to NvRam Fail\n");
179             //exit(EXIT_FAILURE);
180         }
181  #ifdef MTK_NVRAM_AUTO_BACKUP
182     }
183  #endif
184
185     if (!Check_FileVerinFirstBoot()) {
186         NVRAM_LOG("Check FILE_VER in first boot, and fail to generate FILE_VER\n");
187     }
188
189     //Add for product info feature
190     if (nvram_new_partition_support()) {
191         NVRAM_LOG("Begin excute customer callback!!!\n");
192         init_callback();
193         if (callback_for_nvram_daemon != NULL)
194             ret_callback = callback_for_nvram_daemon();
195         NVRAM_LOG("Callback return %d\n", ret_callback);
196     }
197     //end for product info feature
198
199     if (!Init_AllThreads_In_Nvram()) {
200         NVRAM_LOG("init all threads fail\n");
201     } else {
202         if (0 == property_set("vendor.service.nvram_init", "Ready")) {
203             NVRAM_LOG("Set Ready property success\n");
204         } else {
205             NVRAM_LOG("Set property failed, %s\n", (char*)strerror(errno));
206         }
207     }
208
209     NVRAM_LOG("NVRAM daemon sleep !\n");
210     sleep(10);
211     NVRAM_LOG("NVRAM daemon sync start !\n");
212     sync();
213     NVRAM_LOG("NVRAM daemon sync end !\n");
214     NVRAM_LOG("NVRAM daemon exits !\n");
215     exit(EXIT_SUCCESS);
216  }
217 2）函数Init_AllThreads_In_Nvram中遍历g_akNUData数组

98  boolInit_AllThreads_In_Nvram(void) {
99      inti,ret;
100     void*thread_result;
101     for (i = 0; i < NU_MAX; ++i) {
102         if (g_akNUData[i].start_routine) {
103             ret = pthread_create(&g_akNUData[i].kThread, NULL, g_akNUData[i].start_routine,
104                                  NULL);
105             if (ret != 0) {
106                 //NVRAM_LOG("%s Thread creation failed\n", g_akNUData[i].pcName);
107                 return false;
108             }
109         }
110     }
111     //NVRAM_LOG("Finish thread create\n");
112
113     for (i = NU_MAX - 1; i >= 0 ; --i) {
114         if (g_akNUData[i].start_routine) {
115             ret = pthread_join(g_akNUData[i].kThread, &thread_result);
116             if (ret != 0) {
117                 //NVRAM_LOG("%s Thread join failed\n", g_akNUData[i].pcName);
118                 return false;
119             }
120         }
121     }
122     //NVRAM_LOG("Finish thread joint\n");
123     return true;
124  }

3)g_akNUData数组中跑到NVRAM_WIFI，由此进入到wifi moudle nv操作

80  static NVRAM_USER_DATAg_akNUData[NU_MAX] = {
81      {"Battery", 0, NVRAM_BATTERY},
82  #ifdef NVRAM_HAVE_WIFI_BT
83      {"Bluetooth", 0, NVRAM_BT},
84      {"WIFI", 0, NVRAM_WIFI},
85  #endif

2. 下面进入到nvram_wifi.c中，开始进行wifi模块的nvram动作

63  /* Just tell NVRAM to create wifi default record */
64  void*NVRAM_WIFI(void*arg) {
65      F_IDwifi_nvram_fd,wifi_custom_nvram_fd;
66      intrec_size = 0;
67      intrec_num = 0;
68  #ifdef WIFI_MULTI_NVRAM_SUPPORT
69      WIFI_CFG_PARAM_STRUCTwifi_nvram,zero;
70      unsigned intchipId = 0;
71      intchipId_ready_retry = 0;
72      charready_val[PROPERTY_VALUE_MAX] = {0};
73      charchipId_val[PROPERTY_VALUE_MAX] = {0};
74      charhwboardid[PROPERTY_VALUE_MAX] = {0};
75  #endif
76      //NVRAM_LOG("[NVRAM Daemon]wifi lid %d ++\n",AP_CFG_RDEB_FILE_WIFI_LID);
77      NVRAM_LOG("[NVRAM Daemon]wifi lid %d ++\n", iFileWIFILID);
78      //wifi_nvram_fd = NVM_GetFileDesc(AP_CFG_RDEB_FILE_WIFI_LID, &rec_size, &rec_num, true);
79      wifi_nvram_fd = NVM_GetFileDesc(iFileWIFILID, &rec_size, &rec_num, ISWRITE);
80      NVRAM_LOG("[wifi] wifi FD %d rec_size %d rec_num %d\n", wifi_nvram_fd.iFileDesc, rec_size, rec_num);
81
82  #ifdef WIFI_MULTI_NVRAM_SUPPORT
83      do {
84          if (property_get("vendor.connsys.driver.ready", ready_val, NULL) &&
85                  0 == strcmp(ready_val, "yes")) {
86              property_get("vendor.connsys.adie.chipid", chipId_val, NULL);
87              chipId = (unsigned int)strtoul(chipId_val, NULL, 16);
88              break;
89          } else {
90              chipId_ready_retry ++;
91              usleep(500000);
92          }
93      } while (chipId_ready_retry < 100);
94
95      NVRAM_LOG("[wifi] chipId = %x chipId_ready_retry = %d\n", chipId, chipId_ready_retry);
96      if (rec_num != 1) {
97          NVRAM_LOG("Unexpected record num %d", rec_num);
98          NVM_CloseFileDesc(wifi_nvram_fd);
99          return NULL;
100     }
101
102     if (read(wifi_nvram_fd.iFileDesc, &wifi_nvram, rec_num * rec_size) < 0) {
103         NVRAM_LOG("Read NVRAM fails %d\n", errno);
104         return NULL;
105     }
106
107     memset(&zero, 0, sizeof(WIFI_CFG_PARAM_STRUCT));
108
109     lseek(wifi_nvram_fd.iFileDesc, 0, 0);
110     if (0 == memcmp(&wifi_nvram, &zero, sizeof(WIFI_CFG_PARAM_STRUCT))) {
111         if (chipId == 0x6631) {
112

第一个主要动作在NVM_GetFileDesc中

先open WIFI文件，检查WIFI file是否存在

4832   if (IsRead) {
4833        iFileDesc = open(pCfgFielTable[iRealFileLid].cFileName, O_RDONLY);
4834    } else {
4835        iFileDesc = open(pCfgFielTable[iRealFileLid].cFileName, O_RDWR);
4836    }

如果不存在，Create the dir path，并NVM_ResetFileToDefault

4842   if (iFileDesc == -1) { //if file doesn't exist
4843        if (access(g_pcNVM_Flag, F_OK) == 0) {
4844            NVRAM_LOG("File is not exist, try to restore from binregion!!!");
4845            for (i = 0; i < (int)g_Backup_File_Count; i++) {
4846                if ((unsigned int)file_lid == aBackupToBinRegion[i].iLID) {
4847                    if (NVM_RestoreFromBinRegion_OneFile(file_lid, NULL)) {
4848                        NVRAM_LOG("successfully restore.\n");
4849                        goto ProtectData;
4850                    }
4851                    break;
4852                }
4853            }
4854        }
4855        NVRAM_LOG("Create the dir path of %s\n", pCfgFielTable[iRealFileLid].cFileName);
4856        iFileDesc = open_file_with_dirs(pCfgFielTable[iRealFileLid].cFileName,
4857                                        O_CREAT | O_RDWR, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); //create the file
4858        if (iFileDesc == -1) {
4859            NVRAM_LOG("Error Num %s\n", (char*)strerror(errno));
4860            NVRAM_LOG("Error NVM_GetFileDesc open_file_with_dirs file fail: %s\n",
4861                      pCfgFielTable[iRealFileLid].cFileName);
4862            } else {
4863        close(iFileDesc);
4864            }
4865        if (!NVM_ResetFileToDefault(file_lid)) {
4866            NVRAM_LOG("ResetFileToDefault Failed\n");
4867            return FileID;
4868        }
4869    }

需要关注 NVM_ResetFileToDefault中的switch (pCfgFielTable[iRealFileLid].stDefualType，与CFG_file_info_custom.h中的参数设置：DEFAULT_ZERO

106              "/mnt/vendor/nvdata/APCFG/APRDEB/WIFI",         VER(AP_CFG_RDEB_FILE_WIFI_LID),         CFG_FILE_WIFI_REC_SIZE,
107              CFG_FILE_WIFI_REC_TOTAL,               DEFAULT_ZERO,                   0, DataConvert , WIFI_ConvertFunc_wifimac
108          },
109

如果存在，则比较前后版本的wifi LID version值并决定是否进行覆盖

4869   } else {
4870        close(iFileDesc);//avoid the bug of re-open file
4871        if (!NVM_CmpFileVerNo(file_lid)) {
4872            // if file version is not same, convert it.
4873            if (pCfgFielTable[iRealFileLid].bDataProcessingType == DataReset) { //Reset Data
4874                NVRAM_LOG("NVM_ReadFileVerInfo NVM_CheckFileInfo Fail: Reset!!! \n");
4875                iFileDesc = open(pCfgFielTable[iRealFileLid].cFileName, O_TRUNC);
4876                if (iFileDesc == -1) {
4877                    NVRAM_LOG("NVM_Clear File Content Fail_Get File Desc \n");
4878                    return FileID;
4879                }
4880                close(iFileDesc);
4881                if (!NVM_ResetFileToDefault(file_lid))
4882                    return FileID;
4883            } else {
4884                NVRAM_LOG("NVM_ReadFileVerInfo NVM_CheckFileInfo Fail: Convert!!! \n");
4885                //only for test
4886                iResult = NVM_DataVerConvert(file_lid);
4887                if (iResult == 0) {
4888                    iFileDesc = open(pCfgFielTable[iRealFileLid].cFileName, O_TRUNC);
4889                    if (iFileDesc == -1) {
4890                        NVRAM_LOG("NVM_Clear File Content Fail_Get File Desc \n");
4891                        return FileID;
4892                    }
4893                    close(iFileDesc);
4894                    if (!NVM_ResetFileToDefault(file_lid))
4895                        return FileID;
4896                }
4897            }
4898        }
4899
4900    }

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