+static void setup_macaddr(void)
+{
+#if CONFIG_IS_ENABLED(CMD_NET)
+ int ret;
+ const char *cpuid = getenv("cpuid#");
+ u8 hash[SHA256_SUM_LEN];
+ int size = sizeof(hash);
+ u8 mac_addr[6];
+
+ /* Only generate a MAC address, if none is set in the environment */
+ if (getenv("ethaddr"))
+ return;
+
+ if (!cpuid) {
+ debug("%s: could not retrieve 'cpuid#'\n", __func__);
+ return;
+ }
+
+ ret = hash_block("sha256", (void *)cpuid, strlen(cpuid), hash, &size);
+ if (ret) {
+ debug("%s: failed to calculate SHA256\n", __func__);
+ return;
+ }
+
+ /* Copy 6 bytes of the hash to base the MAC address on */
+ memcpy(mac_addr, hash, 6);
+
+ /* Make this a valid MAC address and set it */
+ mac_addr[0] &= 0xfe; /* clear multicast bit */
+ mac_addr[0] |= 0x02; /* set local assignment bit (IEEE802) */
+ eth_setenv_enetaddr("ethaddr", mac_addr);
+#endif
+
+ return;
+}
+