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board: samsung: e850-96: Set ethaddr

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Set the environment variable for Ethernet MAC address (ethaddr). Use the
SoC ID to make sure it's unique. It'll be formatted in a way that
follows the consecutive style of the serial number ("serial#" variable),
i.e.:

    OTP_CHIPID0   = 0xf51c8113
    OTP_CHIPID1   = 0x236
    get_chip_id() = 0x236f51c8113
    serial#       = 00000236f51c8113
    ethaddr       = 02:36:f5:1c:81:13

where corresponding bytes of the MAC address are:

    mac_addr[0]   = 0x02   // OTP_CHIPID1[15:8]
    mac_addr[1]   = 0x36   // OTP_CHIPID1[7:0]
    mac_addr[2]   = 0xf5   // OTP_CHIPID0[31:24]
    mac_addr[3]   = 0x1c   // OTP_CHIPID0[23:16]
    mac_addr[4]   = 0x81   // OTP_CHIPID0[15:8]
    mac_addr[5]   = 0x13   // OTP_CHIPID0[7:0]

because OTP_CHIPID1 has only 16 significant bits (with actual ID
values), and all 32 bits of OTP_CHIPID0 are significant.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Sam Protsenko
2025-08-06 17:27:02 -05:00
committed by Minkyu Kang
parent 3b36c242eb
commit cb64735bdd
1 changed files with 25 additions and 0 deletions
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25
board/samsung/e850-96/e850-96.c
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@@ -8,6 +8,7 @@
#include <env.h>
#include <init.h>
#include <mapmem.h>
#include <net.h>
#include <asm/io.h>
#include "fw.h"
@@ -92,11 +93,35 @@ static void setup_serial(void)
env_set("serial#", serial_str);
}
static void setup_ethaddr(void)
{
u64 serial_num;
u32 mac_hi, mac_lo;
u8 mac_addr[6];
if (env_get("ethaddr"))
return;
serial_num = get_chip_id();
mac_lo = (u32)serial_num; /* OTP_CHIPID0 */
mac_hi = (u32)(serial_num >> 32UL); /* OTP_CHIPID1 */
mac_addr[0] = (mac_hi >> 8) & 0xff;
mac_addr[1] = mac_hi & 0xff;
mac_addr[2] = (mac_lo >> 24) & 0xff;
mac_addr[3] = (mac_lo >> 16) & 0xff;
mac_addr[4] = (mac_lo >> 8) & 0xff;
mac_addr[5] = mac_lo & 0xff;
mac_addr[0] &= ~0x1; /* make sure it's not a multicast address */
if (is_valid_ethaddr(mac_addr))
eth_env_set_enetaddr("ethaddr", mac_addr);
}
int board_late_init(void)
{
int err;
setup_serial();
setup_ethaddr();
/*
* Do this in board_late_init() to make sure MMC is not probed before