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
", 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_END
static 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);
else
imx6q_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_M5272
if (FEC_FLASHMAC)
iap = (unsigned char *)FEC_FLASHMAC;
#else
if (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