On Mon, Sep 26, 2022 at 7:53 PM Christian Kohlschütter christian@kohlschutter.com wrote:
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.
Port from uboot-rockchip 0c294d0, fix compilation issues and adjust coding style.
rockchip: board: puma_rk3399: derive ethaddr from cpuid rockchip: board: puma_rk3399: add support for serial# and cpuid# rockchip: efuse: add (misc) driver for RK3399 non-secure efuse block via efuses
Signed-off-by: Christian Kohlschütter christian@kohlschutter.com
board/rockchip/evb_rk3399/evb-rk3399.c | 120 +++++++++++++++++++++++++ configs/nanopi-r4s-rk3399_defconfig | 4 + drivers/misc/Makefile | 2 +-
There's already code in arch/arm/mach-rockchip/misc.c that does pretty much the same thing.
IIRC all you need to do is enable MISC_INIT_R and ROCKCHIP_EFUSE or ROCKCHIP_OTP.
ChenYu