board: amlogic: vim3: configure serial# from ethaddr

The Khadas VIM3 and VIM3L boards, which are supported in Android via
Yukawa [1] need a serial number for usb/fastboot enumeration.

Whenever the environment does not provide a serial#, use the eth mac
address as serial#.

[1] https://source.android.com/setup/build/devices#vim3_and_vim3l_boards

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20220119142400.127342-1-mkorpershoek@baylibre.com

diff --git a/board/amlogic/vim3/vim3.c b/board/amlogic/vim3/vim3.c
index 5d9ac64..fcd60ab 100644 (file)
--- a/board/amlogic/vim3/vim3.c
+++ b/board/amlogic/vim3/vim3.c
@@ -153,6 +153,7 @@ int misc_init_r(void)
 {
        u8 mac_addr[MAC_ADDR_LEN];
        char efuse_mac_addr[EFUSE_MAC_SIZE], tmp[3];
+       char serial_string[EFUSE_MAC_SIZE + 1];
        ssize_t len;
 
        if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
@@ -177,5 +178,13 @@ int misc_init_r(void)
                eth_env_get_enetaddr("ethaddr", mac_addr);
        }
 
+       if (!env_get("serial#")) {
+               eth_env_get_enetaddr("ethaddr", mac_addr);
+               sprintf(serial_string, "%02X%02X%02X%02X%02X%02X",
+                       mac_addr[0], mac_addr[1], mac_addr[2],
+                       mac_addr[3], mac_addr[4], mac_addr[5]);
+               env_set("serial#", serial_string);
+       }
+
        return 0;
 }