From 8adc9d18a8344cba01bcaa13318ca8cf1afac312 Mon Sep 17 00:00:00 2001 From: Klaus Goger Date: Fri, 5 May 2017 19:21:40 +0200 Subject: [PATCH] rockchip: board: puma_rk3399: derive ethaddr from cpuid Generate a MAC address based on the cpuid available in the efuse block: Use the first 6 byte of the cpuid's SHA256 hash and set the locally administered bits. Also ensure that the multicast bit is cleared. The MAC address is only generated and set if there is no ethaddr present in the saved environment. Signed-off-by: Klaus Goger Signed-off-by: Philipp Tomsich Reviewed-by: Simon Glass --- .../puma_rk3399/puma-rk3399.c | 42 ++++++++++++++++++- 1 file changed, 40 insertions(+), 2 deletions(-) diff --git a/board/theobroma-systems/puma_rk3399/puma-rk3399.c b/board/theobroma-systems/puma_rk3399/puma-rk3399.c index ea6d256814..6fff3e1ae6 100644 --- a/board/theobroma-systems/puma_rk3399/puma-rk3399.c +++ b/board/theobroma-systems/puma_rk3399/puma-rk3399.c @@ -68,6 +68,42 @@ out: return 0; } +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; +} + static void setup_serial(void) { #if CONFIG_IS_ENABLED(ROCKCHIP_EFUSE) @@ -79,8 +115,9 @@ static void setup_serial(void) u64 serialno; char serialno_str[16]; - /* the first misc device will be used */ - ret = uclass_get_device(UCLASS_MISC, 0, &dev); + /* retrieve the device */ + ret = uclass_get_device_by_driver(UCLASS_MISC, + DM_GET_DRIVER(rockchip_efuse), &dev); if (ret) { debug("%s: could not find efuse device\n", __func__); return; @@ -123,6 +160,7 @@ static void setup_serial(void) int misc_init_r(void) { setup_serial(); + setup_macaddr(); return 0; } -- 2.25.1