怎样用rk3368的Chip ID去生成wifi或者以太网的mac地址呢

Platform: RK3368
OS: Android 6.0
Kernel: 3.10.0
rk3368的Chip ID是从芯片eFuse中读取出来的。然后赋值给system_serial_low和system_serial_high.
/proc/cpuinfo中的Serial字段就是用的这两个值。
arch/arm64/boot/dts/rk3368.dtsi
efuse_256@ffb00000 {
compatible = "rockchip,rk3368-efuse-256";
reg = <0x0 0xffb00000 0x0 0x8>;
};
arch/arm/mach-rockchip/efuse.c
static void __init rk3288_efuse_init(void)
{
int ret;
pr_err("%sn", __func__);
ret = rk3288_efuse_readregs(0, 32, efuse_buf);
if (ret == 32) {
if (efuse_buf[2] == 0x33 && efuse_buf[3] == 0x86)
efuse.get_leakage = rk3368_get_leakage;
else
efuse.get_leakage = rk3288_get_leakage;
efuse.efuse_version = rk3288_get_efuse_version();
efuse.process_version = rk3288_get_process_version();
rockchip_set_cpu_version((efuse_buf[6] >> 4) & 3);
rk3288_set_system_serial();
} else {
pr_err("failed to read eFuse, return %dn", ret);
}
}
static void __init rk3288_set_system_serial(void)
{
int i;
u8 buf[16];
for (i = 0; i < 8; i++) {
buf = efuse_buf[8 + (i << 1)];
buf[i + 8] = efuse_buf[7 + (i << 1)];
}
system_serial_low = crc32(0, buf, 8);
system_serial_high = crc32(system_serial_low, buf + 8, 8);
}
所以可以用Chip ID来生成wifi或者以太网的mac地址：
Wi-Fi:
net/rfkill/rfkill-wlan.c
static int create_wifi_addr_from_system_serial()
{
if (system_serial_low != 0 && system_serial_high != 0) {
wifi_custom_mac_addr[0] = (system_serial_high >> 8) & 0xfe;/* clear multicast bit */
wifi_custom_mac_addr[1] = system_serial_high | 0x02;/* set local assignment bit (IEEE802) */
wifi_custom_mac_addr[2] = system_serial_low >> 24;
wifi_custom_mac_addr[3] = system_serial_low >> 16;
wifi_custom_mac_addr[4] = system_serial_low >> 8;
wifi_custom_mac_addr[5] = system_serial_low;
}
return 0;
}
int rockchip_wifi_mac_addr(unsigned char *buf)
{
     char mac_buf[20] = {0};
@@ -620,6 +635,11 @@ int rockchip_wifi_mac_addr(unsigned char *buf)
     wifi_custom_mac_addr[2],wifi_custom_mac_addr[3],wifi_custom_mac_addr[4],wifi_custom_mac_addr[5]);
     LOG("falsh wifi_custom_mac_addr=[%s]n", mac_buf);
+       // from the system serial number
+       if (!is_valid_ether_addr(wifi_custom_mac_addr)) {
+               create_wifi_mac_from_system_serial(wifi_custom_mac_addr);
+       }
+
#ifdef ENABLE_WIFI_RAND_MAC
以太网:
drivers/net/ethernet/rockchip/eth_mac.c
int eth_mac_from_system_serial(u8 *addr)
{
if (system_serial_low != 0 && system_serial_high != 0) {
pr_info("[eth]Create an address from the system serial number.n");
addr[0] = (system_serial_high >> 24) & 0xfe;/* clear multicast bit */
addr[1] = (system_serial_high >> 16) | 0x02;/* set local assignment bit (IEEE802) */
addr[2] = system_serial_low >> 24;
addr[3] = system_serial_low >> 16;
addr[4] = system_serial_low >> 8;
addr[5] = system_serial_low;
}
return 0;
}
+++ b/drivers/net/ethernet/rockchip/gmac/stmmac_main.c
@@ -1691,6 +1691,8 @@ static void stmmac_check_ether_addr(struct stmmac_priv *priv)
                if (!is_valid_ether_addr(priv->dev->dev_addr))
                        eth_mac_idb(priv->dev->dev_addr);
                if (!is_valid_ether_addr(priv->dev->dev_addr))
+                       eth_mac_from_system_serial(priv->dev->dev_addr);
+               if (!is_valid_ether_addr(priv->dev->dev_addr))
                        eth_hw_addr_random(priv->dev);
        }

原作者：D00PING