[PATCH] rk3399: r4s: Derive local MAC address if EEPROM is missing

[Christian Kohlschütter]

Some RK3399 boards, such as newer revisions of NanoPi R4S, do not
provide an EEPROM chip containing a globally unique MAC address.

Currently, this means that a randomly generated temporary MAC address
may be generated each time the device is rebooted, leading to ARP cache
issues and other confusing bugs.

Since RK3399 CPUs provide a built-in unique serial number, we can
reliably derive a locally MAC address from it by reading the
corresponding bits from the non-secure efuse block.

Enable configuration options that allow deriving a local MAC address
from the CPU serial number.
---
 configs/nanopi-r4s-rk3399_defconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configs/nanopi-r4s-rk3399_defconfig b/configs/nanopi-r4s-rk3399_defconfig
index 46ba07f4d5..aa89ac5854 100644
--- a/configs/nanopi-r4s-rk3399_defconfig
+++ b/configs/nanopi-r4s-rk3399_defconfig
@@ -63,3 +63,7 @@ CONFIG_VIDEO_ROCKCHIP=y
 CONFIG_DISPLAY_ROCKCHIP_HDMI=y
 CONFIG_SPL_TINY_MEMSET=y
 CONFIG_ERRNO_STR=y
+CONFIG_MISC=y
+CONFIG_MISC_INIT_R=y
+CONFIG_ROCKCHIP_EFUSE=y
+CONFIG_ROCKCHIP_OTP=y
-- 
2.36.2