cat /proc/cpuinfo两个板卡一致1.原因分析先说结论这个 Serial 不是芯片真实 ID是 U-Boot 塞进设备树的一个固定值内核里真正按芯片唯一 ID 计算序列号的代码被一个永远不成立的宏编译掉了。 原因分析/proc/cpuinfo 的 Serial 有两个来源优先级如下 设备树根节点的 serial-number 属性U-Boot 启动时注入—— setup.c#L959-L970 优先使用它。你们的 U-Boot 是预编译的 uboot.img它读不到有效的每芯片 ID 时会用固定回退值生成 serial#于是两块板都是437255c32d0716be。 内核从 OTP 芯片唯一 ID 算出的 CRC 序列号 —— rockchip-cpuinfo.c 会读 OTP 里16字节的芯片 ID每颗芯片出厂唯一并算出序列号但这段代码被 #ifdef CONFIG_NO_GKI 包住而整个内核树里根本不存在 NO_GKI 这个 Kconfig 符号所以从未生效。 前提条件其实都齐了rk3506_emmc_defconfig 已有 CONFIG_ROCKCHIP_CPUINFOy、CONFIG_NVMEM_ROCKCHIP_OTPyrk3502.dtsi 里也有 otp 和 cpuinfo 节点otp_id:ida。 已做的修改 rockchip-cpuinfo.c去掉 #ifdef CONFIG_NO_GKI 保护让驱动始终从 OTP 芯片 ID 计算 system_serial_high/low。 setup.c/proc/cpuinfo 输出时优先使用 OTP 派生的序列号仅当其为0时才回退到 U-Boot 注入的 serial-number这样也不受驱动 probe 时序影响。2.修改patchmodified:SMH-STD3506/sdk_linux/linux-6.1/arch/arm/kernel/setup.c modified:SMH-STD3506/sdk_linux/linux-6.1/drivers/soc/rockchip/rockchip-cpuinfo.c no changes added tocommit(usegit addand/orgit commit -a)roota4694c04b1a9:/home/cyzhangep/workspace/3506_130version/std_v3_0319/code/device/board/hhwl# git diff SMH-STD3506/sdk_linux/linux-6.1/arch/arm/kernel/setup.c diff--git a/SMH-STD3506/sdk_linux/linux-6.1/arch/arm/kernel/setup.c b/SMH-STD3506/sdk_linux/linux-6.1/arch/arm/kernel/setup.c index cb88c6e69..d6dca0a7e100644---a/SMH-STD3506/sdk_linux/linux-6.1/arch/arm/kernel/setup.cb/SMH-STD3506/sdk_linux/linux-6.1/arch/arm/kernel/setup.c -1322,71322,15staticintc_show(structseq_file*m,void*v)seq_printf(m,Hardware\t: %s\n,machine_name);seq_printf(m,Revision\t: %04x\n,system_rev);-seq_printf(m,Serial\t\t: %s\n,system_serial);/* prefer the serial derived from the SoC unique chip id over the * bootloader-provided serial-number DT property, which may be a * fixed fallback value identical across boards */if(system_serial_high||system_serial_low)seq_printf(m,Serial\t\t: %08x%08x\n,system_serial_high,system_serial_low);elseseq_printf(m,Serial\t\t: %s\n,system_serial);return0;}roota4694c04b1a9:/home/cyzhangep/workspace/3506_130version/std_v3_0319/code/device/board/hhwl# roota4694c04b1a9:/home/cyzhangep/workspace/3506_130version/std_v3_0319/code/device/board/hhwl# roota4694c04b1a9:/home/cyzhangep/workspace/3506_130version/std_v3_0319/code/device/board/hhwl# git diff SMH-STD3506/sdk_linux/linux-6.1/drivers/soc/rockchip/rockchip-cpuinfo.c diff--git a/SMH-STD3506/sdk_linux/linux-6.1/drivers/soc/rockchip/rockchip-cpuinfo.c b/SMH-STD3506/sdk_linux/linux-6.1/drivers/soc/rockchip/rockchip-cpuinfo.c index02befb165..74f19902c100644---a/SMH-STD3506/sdk_linux/linux-6.1/drivers/soc/rockchip/rockchip-cpuinfo.cb/SMH-STD3506/sdk_linux/linux-6.1/drivers/soc/rockchip/rockchip-cpuinfo.c -80,1380,12staticintrockchip_cpuinfo_probe(structplatform_device*pdev)dev_info(dev,SoC\t\t: %lx\n,rockchip_soc_id);-#ifdef CONFIG_NO_GKI/* derive a per-chip serial from the OTP chip id (unique per die) */system_serial_lowcrc32(0,buf,8);system_serial_highcrc32(system_serial_low,buf8,8);dev_info(dev,Serial\t\t: %08x%08x\n,system_serial_high,system_serial_low);-#endifreturn0;}