[U-Boot] [PATCH] rockchip: derive ethaddr from cpuid

[Kever Yang]

Hi Rohan,

     The code change looks good to me, but could you help to separate

the rock pi config update into another patch?


Thanks,

- Kever

On 2019/7/9 下午6:37, Rohan Garg wrote:
> Generate a MAC address based on the cpuid available in the efuse
> block: Use the first 6 byte of the cpuid's SHA256 hash and set the
> locally administered bits. Also ensure that the multicast bit is
> cleared.
>
> The MAC address is only generated and set if there is no ethaddr
> present in the saved environment.
>
> This is based off of Klaus Goger's work in 8adc9d
>
> Signed-off-by: Rohan Garg <rohan.garg at collabora.com>
>
> ---
>
>   board/rockchip/evb_rk3399/evb-rk3399.c | 98 ++++++++++++++++++++++++++
>   configs/rock-pi-4-rk3399_defconfig     |  1 +
>   2 files changed, 99 insertions(+)
>
> diff --git a/board/rockchip/evb_rk3399/evb-rk3399.c b/board/rockchip/evb_rk3399/evb-rk3399.c
> index eb1b832274..af57cd86a5 100644
> --- a/board/rockchip/evb_rk3399/evb-rk3399.c
> +++ b/board/rockchip/evb_rk3399/evb-rk3399.c
> @@ -6,8 +6,11 @@
>   #include <common.h>
>   #include <dm.h>
>   #include <dm/pinctrl.h>
> +#include <environment.h>
> +#include <misc.h>
>   #include <asm/arch-rockchip/periph.h>
>   #include <power/regulator.h>
> +#include <u-boot/sha256.h>
>   
>   int board_init(void)
>   {
> @@ -33,3 +36,98 @@ int board_init(void)
>   out:
>   	return 0;
>   }
> +
> +static void setup_macaddr(void)
> +{
> +#if CONFIG_IS_ENABLED(CMD_NET)
> +	int ret;
> +	const char *cpuid = env_get("cpuid#");
> +	u8 hash[SHA256_SUM_LEN];
> +	int size = sizeof(hash);
> +	u8 mac_addr[6];
> +
> +	/* Only generate a MAC address, if none is set in the environment */
> +	if (env_get("ethaddr"))
> +		return;
> +
> +	if (!cpuid) {
> +		debug("%s: could not retrieve 'cpuid#'\n", __func__);
> +		return;
> +	}
> +
> +	ret = hash_block("sha256", (void *)cpuid, strlen(cpuid), hash, &size);
> +	if (ret) {
> +		debug("%s: failed to calculate SHA256\n", __func__);
> +		return;
> +	}
> +
> +	/* Copy 6 bytes of the hash to base the MAC address on */
> +	memcpy(mac_addr, hash, 6);
> +
> +	/* Make this a valid MAC address and set it */
> +	mac_addr[0] &= 0xfe;  /* clear multicast bit */
> +	mac_addr[0] |= 0x02;  /* set local assignment bit (IEEE802) */
> +	eth_env_set_enetaddr("ethaddr", mac_addr);
> +#endif
> +}
> +
> +static void setup_serial(void)
> +{
> +#if CONFIG_IS_ENABLED(ROCKCHIP_EFUSE)
> +	const u32 cpuid_offset = 0x7;
> +	const u32 cpuid_length = 0x10;
> +
> +	struct udevice *dev;
> +	int ret, i;
> +	u8 cpuid[cpuid_length];
> +	u8 low[cpuid_length/2], high[cpuid_length/2];
> +	char cpuid_str[cpuid_length * 2 + 1];
> +	u64 serialno;
> +	char serialno_str[17];
> +
> +	/* retrieve the device */
> +	ret = uclass_get_device_by_driver(UCLASS_MISC,
> +					  DM_GET_DRIVER(rockchip_efuse), &dev);
> +	if (ret) {
> +		debug("%s: could not find efuse device\n", __func__);
> +		return;
> +	}
> +
> +	/* read the cpu_id range from the efuses */
> +	ret = misc_read(dev, cpuid_offset, &cpuid, sizeof(cpuid));
> +	if (ret) {
> +		debug("%s: reading cpuid from the efuses failed\n",
> +		      __func__);
> +		return;
> +	}
> +
> +	memset(cpuid_str, 0, sizeof(cpuid_str));
> +	for (i = 0; i < 16; i++)
> +		sprintf(&cpuid_str[i * 2], "%02x", cpuid[i]);
> +
> +	debug("cpuid: %s\n", cpuid_str);
> +
> +	/*
> +	 * Mix the cpuid bytes using the same rules as in
> +	 *   ${linux}/drivers/soc/rockchip/rockchip-cpuinfo.c
> +	 */
> +	for (i = 0; i < 8; i++) {
> +		low[i] = cpuid[1 + (i << 1)];
> +		high[i] = cpuid[i << 1];
> +	}
> +
> +	serialno = crc32_no_comp(0, low, 8);
> +	serialno |= (u64)crc32_no_comp(serialno, high, 8) << 32;
> +	snprintf(serialno_str, sizeof(serialno_str), "%016llx", serialno);
> +
> +	env_set("cpuid#", cpuid_str);
> +	env_set("serial#", serialno_str);
> +#endif
> +}
> +
> +int misc_init_r(void)
> +{
> +	setup_serial();
> +	setup_macaddr();
> +	return 0;
> +}
> diff --git a/configs/rock-pi-4-rk3399_defconfig b/configs/rock-pi-4-rk3399_defconfig
> index be670df23f..dc84ded86c 100644
> --- a/configs/rock-pi-4-rk3399_defconfig
> +++ b/configs/rock-pi-4-rk3399_defconfig
> @@ -58,3 +58,4 @@ CONFIG_USB_ETHER_SMSC95XX=y
>   CONFIG_USE_TINY_PRINTF=y
>   CONFIG_SPL_TINY_MEMSET=y
>   CONFIG_ERRNO_STR=y
> +CONFIG_MISC_INIT_R=y