imx6的mac地址总是固定的值，所以需要更改，采用的方法是在uboot中设置环境变量,之后在kernel中使用uboot中设置的mac地址的值。本文记录更改的过程。
参考链接：
http://www.cnblogs.com/zengjfgit/p/5711304.html
uboot
lib_arm/board.c void start_armboot (void)
{ ...eth_initialize(gd->bd); ---------------------------+... |
}; | | |
int eth_initialize(bd_t *bis) <-------------+
{ ....../* Try board-specific initialization first. If it fails or isn't * present, try the cpu-specific initialization */ if (board_eth_init(bis) < 0) cpu_eth_init(bis); -------------+ ...... |
} | |
int cpu_eth_init(bd_t *bis) <--------+
{ int rc = -ENODEV;
#if defined(CONFIG_MXC_FEC) rc = mxc_fec_initialize(bis); ------+ | /* Board level init */ | enet_board_init(); | |
#endif | return rc; |
} | |
int mxc_fec_initialize(bd_t *bis) <------+
{ ......if (fec_get_hwaddr(dev, ethaddr) == 0) { ------+ printf("got MAC address from IIM: %pM\n", ethaddr); | memcpy(dev->enetaddr, ethaddr, 6); | fec_set_hwaddr(dev); | } | } | | return 1; |
} | |
static int fec_get_hwaddr(struct eth_device *dev, unsigned char *mac)<--+
{
#ifdef CONFIG_GET_FEC_MAC_ADDR_FROM_IIM fec_get_mac_addr(mac); -------+ return 0; |
#else | return -1; |
#endif |
} | |
#ifdef CONFIG_GET_FEC_MAC_ADDR_FROM_IIM |
int fec_get_mac_addr(unsigned char *mac) <---- +
{
#if 0 unsigned int value; //不读取寄存器中的值 value = readl(OCOTP_BASE_ADDR + HW_OCOTP_MACn(0)); mac[5] = value & 0xff; mac[4] = (value >> 8) & 0xff; mac[3] = (value >> 16) & 0xff; mac[2] = (value >> 24) & 0xff; value = readl(OCOTP_BASE_ADDR + HW_OCOTP_MACn(1)); mac[1] = value & 0xff; mac[0] = (value >> 8) & 0xff;
#else eth_getenv_enetaddr("ethaddr", mac); //使用环境变量设置的mac地址
#endif return 0;
} kernel
1.设备
arch/arm/mach-mx6/board-mx6q_sabresd.c
MACHINE_START(MX6Q_SABRESD, "Freescale i.MX 6Quad/DualLite/Solo Sabre-SD Board")/* Maintainer: Freescale Semiconductor, Inc. */.boot_params = MX6_PHYS_OFFSET + 0x100,.fixup = fixup_mxc_board,.map_io = mx6_map_io,.init_irq = mx6_init_irq,.init_machine = mx6_sabresd_board_init,.timer = &mx6_sabresd_timer,.reserve = mx6q_sabresd_reserve,
MACHINE_ENDstatic void __init mx6_sabresd_board_init(void)
{......imx6_init_fec(fec_data);......
}arch/arm/mach-mx6/mx6_fec.c
void __init imx6_init_fec(struct fec_platform_data fec_data)
{//读取寄存器中的mac地址的值fec_get_mac_addr(fec_data.mac);//这里就已经随机生成了mac地址，在驱动中就不会再次设置，所以注释了//设备注册在驱动注册之前，先不要自动生成mac地址，由驱动来设置
// if (!is_valid_ether_addr(fec_data.mac))
// random_ether_addr(fec_data.mac);if (cpu_is_mx6sl())imx6sl_add_fec(&fec_data);elseimx6q_add_fec(&fec_data);
}2.驱动
drivers/net/fec.c
//驱动设置mac地址
static void __inline__ fec_get_mac(struct net_device *ndev)
{struct fec_enet_private *fep = netdev_priv(ndev);struct fec_platform_data *pdata = fep->pdev->dev.platform_data;unsigned char *iap, tmpaddr[ETH_ALEN];/** try to get mac address in following order:** 1) module parameter via kernel command line in form* fec.macaddr=0x00,0x04,0x9f,0x01,0x30,0xe0*/iap = macaddr;// 检查是否合法，不合法就通过flash设置/** 2) from flash or fuse (via platform data)*/if (!is_valid_ether_addr(iap)) {
#ifdef CONFIG_M5272if (FEC_FLASHMAC)iap = (unsigned char *)FEC_FLASHMAC;
#elseif (pdata)memcpy(iap, pdata->mac, ETH_ALEN);
#endif}// 检查是否合法，不合法就通过bootloader设置/** 3) FEC mac registers set by bootloader*/if (!is_valid_ether_addr(iap)) {*((unsigned long *) &tmpaddr[0]) =be32_to_cpu(readl(fep->hwp + FEC_ADDR_LOW));*((unsigned short *) &tmpaddr[4]) =be16_to_cpu(readl(fep->hwp + FEC_ADDR_HIGH) >> 16);iap = &tmpaddr[0];}// 随机生成/** 4) generate random mac */if (!is_valid_ether_addr(iap)) random_ether_addr(iap);memcpy(ndev->dev_addr, iap, ETH_ALEN);/* Adjust MAC if using macaddr */if (iap == macaddr)ndev->dev_addr[ETH_ALEN-1] = macaddr[ETH_ALEN-1] + fep->pdev->id;
}Tony Liu
2016-9-22, Shenzhen
的操作及一些比较常见的用法)
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