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authorDavid Bauer <mail@david-bauer.net>2021-01-15 02:15:12 +0100
committerDavid Bauer <mail@david-bauer.net>2021-01-18 17:32:52 +0100
commita8a17fd22326f0d1aa7644556eea6010e0779afe (patch)
treeb2c59d0119808ea836f3baff62e7f4f7f37ea6b5
parentf559b89bd0341a0ab3979484ca4c52205343f090 (diff)
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rockchip: use stable MAC-address for NanoPi R2S
The NanoPi R2S does not have a board specific MAC address written inside e.g. an EEPROM, hence why it is randomly generated on first boot. The issue with that however is the lack of a driver for the PRNG. It often results to the same MAC address used on multiple boards by default, as urngd is not active at this early stage resulting in low available entropy. There is however a semi-unique identifier available to us, which is the CID of the used SD card. It is unique to each SD card, hence we can use it to generate the MAC address used for LAN and WAN. Signed-off-by: David Bauer <mail@david-bauer.net>
-rwxr-xr-xtarget/linux/rockchip/armv8/base-files/etc/board.d/02_network9
1 files changed, 8 insertions, 1 deletions
diff --git a/target/linux/rockchip/armv8/base-files/etc/board.d/02_network b/target/linux/rockchip/armv8/base-files/etc/board.d/02_network
index e129fd6a67..48133c81a1 100755
--- a/target/linux/rockchip/armv8/base-files/etc/board.d/02_network
+++ b/target/linux/rockchip/armv8/base-files/etc/board.d/02_network
@@ -17,6 +17,13 @@ rockchip_setup_interfaces()
esac
}
+nanopi_r2s_generate_mac()
+{
+ local sd_hash=$(sha256sum /sys/devices/platform/ff500000.dwmmc/mmc_host/mmc0/mmc0:*/cid)
+ local mac_base=$(macaddr_canonicalize "$(echo "${sd_hash}" | dd bs=1 count=12 2>/dev/null)")
+ echo "$(macaddr_unsetbit_mc "$(macaddr_setbit_la "${mac_base}")")"
+}
+
rockchip_setup_macs()
{
local board="$1"
@@ -26,7 +33,7 @@ rockchip_setup_macs()
case "$board" in
friendlyarm,nanopi-r2s)
- wan_mac=$(macaddr_random)
+ wan_mac=$(nanopi_r2s_generate_mac)
lan_mac=$(macaddr_add "$wan_mac" +1)
;;
esac