- 如何从私有分区获取mac地址？
从私有分区获取mac地址，需要利用到DragonSN工具烧写mac地址到私有分区，然后借助uboot以comdline的形式传递到内核，内核addr_mgt驱动解析。
这里简要描述一下上述过程：
1.lichee/brandy-2.0/u-boot-2018/board/sunxi/sunxi_bootargs.c - +int update_user_data_ali(void)
- +{
- + int data_len;
- + int ret;
- + char output[SST_WIFI_MAC_ADDR_LEN+1];
- + char *sst_info = NULL;
- + int sec_inited = !sunxi_secure_storage_init(); //分区初始化
- + memset(output, 0, SST_WIFI_MAC_ADDR_LEN+1); //获取存放mac地址的地址空间并初始化
- + if (sec_inited) {
- + sst_info = (char *)malloc(SST_INFO_KEY_VALUE_ACTUAL_LEN); //分配存放mac地址的空间并赋值给sst_info结构体
- + if (get_boot_work_mode() != WORK_MODE_BOOT) {
- + return 0;
- + }
- +
- + ret = sunxi_secure_object_read(SST_INFO_KEY_NAME, sst_info, SST_INFO_KEY_VALUE_ACTUAL_LEN, &data_len); //从flash secure storage读出
- + if (ret)
- + pr_msg("=========%s->%d sunxi_secure_object_read failed==============n", __func__, __LINE__);
- + memcpy(output, sst_info + SST_WIFI_MAC_ADDR_OFFSET, SST_WIFI_MAC_ADDR_LEN);
- + env_set("wifi_mac", output);
- + pr_msg("=========%s->%d fly test wifi_mac:%s==============n", __func__, __LINE__, output);
- + }else{
- + pr_msg("=========%s->%d sunxi_secure_storage_init failed==============n", __func__, __LINE__);
- + }
- +
- + free(sst_info);
- + return 0;
- +}
通过sunxi_secure_object_read()接口根据偏移量读取分区中已经烧好的mac地址，赋值给wifi_mac。在通过env_set()接口将获取到的mac地址传递到env。
2.device/config/chips/r818/configs/ailabs_dictpen/linux/env.cfg
- 27 #set kernel cmdline if boot.img or recovery.img has no cmdline we will use this
- 28 setargs_nand=setenv bootargs console=${console}...mac_addr=${mac} wifi_mac=${wifi_mac} bt_mac=${bt_mac}
- 29 setargs_mmc=setenv bootargs console=${console}...mac_addr=${mac} wifi_mac=${wifi_mac} bt_mac=${bt_mac}
- 内核读取env.cfg时再把wifi_mac取出来，通过addr-mgt驱动获取。
3.lichee/linux-4.9/drivers/misc/sunxi-addr-mgt/sunxi-addr-mgt.c - 83 int get_wifi_custom_mac_address(char *addr_str)
- 84 {
- 85 if (IS_TYPE_INVALID(info.type_cur_wifi) ||
- 86 addr_parse(info.addr_wifi, 1))
- 87 return -1;
- 88
- 89 strcpy(addr_str, info.addr_wifi); //直接拷贝info结构体的mac地址属性，最原始的就是uboot阶段的sst_info
- 90 return info.type_cur_wifi;
- 91 }
4.xr829驱动获取lichee/linux-4.9/drivers/net/wireless/xr829/wlan/main.c - 478 extern int get_wifi_custom_mac_address(char *addr_str);
- 479
- 480 #define MAC_FROM_CHIPID
- 481 static void xradio_get_mac_addrs(u8 *macaddr)
- 482 {
- 483 int ret = 0;
- 484 char addr_str[20];
- 485 SYS_BUG(!macaddr);
- 486 /* Check mac addrs param, if exsist, use it first.*/
- 487 #ifdef XRADIO_MACPARAM_HEX
- 488 memcpy(macaddr, xradio_macaddr_param, ETH_ALEN);
- 489 #else
- 490 if (xradio_macaddr_param) {
- 491 ret = xradio_macaddr_char2val(macaddr, xradio_macaddr_param);
- 492 }
- 493 #endif
- 494 if (ret < 0 || !MACADDR_VAILID(macaddr)) {
- 495 ret = get_wifi_custom_mac_address(addr_str); //直接调用addr_mgt驱动的接口，即从分区读的方式获取mac地址。
- 496 if (ret != -1) {
- 497 sscanf(addr_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
- 498 &macaddr[0], &macaddr[1], &macaddr[2],
- 499 &macaddr[3], &macaddr[4], &macaddr[5]);
- 500 }
- 501 }
- 502
- 503 /* Use random value to set mac addr for the first time,
- 504 * and save it in wifi config file. TODO: read from product ID*/
- 505 if (ret < 0 || !MACADDR_VAILID(macaddr)) {
- 506 #ifdef XRADIO_MACPARAM_HEX
- 507 ret = access_file(WIFI_CONF_PATH, macaddr, ETH_ALEN, 1); //自定义mac地址写入文件后，从文件获取mac地址
- 508 #else
- 509 char c_mac[XRADIO_MAC_CHARLEN+2] = {0};
- 510 ret = access_file(WIFI_CONF_PATH, c_mac, XRADIO_MAC_CHARLEN, 1);
- 511 if (ret >= 0) {
- 512 ret = xradio_macaddr_char2val(macaddr, c_mac);
- 513 }
- 514 #endif
- 515
- 516 if (ret < 0 || !MACADDR_VAILID(macaddr)) {
- 517 #if defined(MAC_FROM_CHIPID)
- 518 u32 databuf[4] = {0};
- 519
- 520 sunxi_get_soc_chipid((u8 *)databuf); //获取chipid后定制mac地址的方式
- 521 macaddr[0] = (((databuf[1] >> 28) & 0x0f) | ((databuf[2] & 0x0f) << 4)) & 0xff;
- 522 macaddr[1] = (databuf[2] >> 4) & 0xff;
- 523 macaddr[2] = (databuf[2] >> 12) & 0xff;
- 524 macaddr[3] = (databuf[3] >> 6) & 0xff;
- 525 macaddr[4] = (databuf[3] >> 16) & 0xff;
- 526 macaddr[5] = (databuf[3] >> 26) & 0xff;
- 527 #else
- 528 get_random_bytes(macaddr, 6); //随机生成mac地址的方式
- 529 #endif
- 530 macaddr[0] &= 0xFC;
- 531 #ifdef XRADIO_MACPARAM_HEX
- 532 ret = access_file(WIFI_CONF_PATH, macaddr, ETH_ALEN, 0);
- 533 #else
- 534 ret = xradio_macaddr_val2char(c_mac, macaddr);
- 535 ret = access_file(WIFI_CONF_PATH, c_mac, ret, 0);
- 536 #endif
- 537 if (ret < 0)
- 538 xradio_dbg(XRADIO_DBG_ERROR, "Access_file failed, path:%s!n",
- 539 WIFI_CONF_PATH);
- 540 if (!MACADDR_VAILID(macaddr)) {
- 541 xradio_dbg(XRADIO_DBG_WARN, "Use default Mac addr!n"); //驱动默认可以写死一个mac地址。
- 542 macaddr[0] = 0xDC;
- 543 macaddr[1] = 0x44;
- 544 macaddr[2] = 0x6D;
- 545 } else {
- 546 xradio_dbg(XRADIO_DBG_NIY, "Use random Mac addr!n");
- 547 }
- 548 } else {
- 549 xradio_dbg(XRADIO_DBG_NIY, "Use Mac addr in file!n");
- 550 }
- 551 }
- 552 xradio_dbg(XRADIO_DBG_NIY, "MACADDR=%02x:%02x:%02x:%02x:%02x:%02xn",
- 553 macaddr[0], macaddr[1], macaddr[2],
- 554 macaddr[3], macaddr[4], macaddr[5]);
- 555 }
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