1，配置,后面补充
2，挂死后串口抓取日志，分析日志查看打印：
3.341914\] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 \[ 3.350363\] mmc0: SDHCI controller on fe310000.sdhci \[fe310000.sdhci\] using ADMA \[ 3.376962\] Mem abort info: \[ 3.377859\] ESR = 0x96000005 \[ 3.378136\] EC = 0x25: DABT (current EL), IL = 32 bits \[ 3.378615\] SET = 0, FnV = 0 \[ 3.378891\] EA = 0, S1PTW = 0 \[ 3.379167\] Data abort info: \[ 3.379421\] ISV = 0, ISS = 0x00000005 \[ 3.379765\] CM = 0, WnR = 0 \[ 3.380030\] \[0000000000000008\] user address but active_mm is swapper \[ 3.380592\] Internal error: Oops: 96000005 \[#1\] SMP \[ 3.381028\] Modules linked in: \[ 3.381310\] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.10.160 #10 \[ 3.381857\] Hardware name: Rockchip RK3568 KICKPI K1B Board (DT) \[ 3.382384\] pstate: 60c00009 (nZCv daif +PAN +UAO -TCO BTYPE=--) \[ 3.382918\] pc : rfkill_wlan_probe+0x518/0x63c \[ 3.383309\] lr : rfkill_wlan_probe+0x514/0x63c \[ 3.383699\] sp : ffffffc00a74bb20 \[ 3.383998\] x29: ffffffc00a74bb20 x28: 0000000000000000 \[ 3.384468\] x27: ffffffc0097bf648 x26: ffffffc0097bf648 \[ 3.384939\] x25: ffffffc009ae6b90 x24: ffffffc00a5c05b0 \[ 3.385410\] x23: ffffffc00a713000 x22: ffffff8003a1fb00 \[ 3.385880\] x21: ffffffc0097bf4c8 x20: 0000000000000000 \[ 3.386351\] x19: ffffff8003435c00 x18: 0000000000000030 \[ 3.386822\] x17: 0000000000800d0f x16: 00000000000050ba \[ 3.387292\] x15: ffffffffffffffff x14: ffffffc08a74b817 \[ 3.387763\] x13: 0000000000000006 x12: ffffffc00a74b81f \[ 3.388233\] x11: fffffffffffca178 x10: ffffffc00a3a6a30 \[ 3.388704\] x9 : ffffffc0080bec14 x8 : ffffffc00a2f6a30 \[ 3.389174\] x7 : ffffffc00a3a6a30 x6 : 0000000000000000 \[ 3.389645\] x5 : 0000000000017ff4 x4 : 0000000000000000 \[ 3.390115\] x3 : 0000000000000000 x2 : 0000000000000000 \[ 3.390586\] x1 : ffffff8002f38000 x0 : 0000000000000000 \[ 3.391057\] Call trace: \[ 3.391279\] rfkill_wlan_probe+0x518/0x63c \[ 3.391649\] platform_drv_probe+0x58/0xac \[ 3.392005\] really_probe+0x10c/0x510 \[ 3.392328\] driver_probe_device+0x74/0x15c \[ 3.392696\] device_driver_attach+0xbc/0xcc \[ 3.393064\] __driver_attach+0x118/0x190 \[ 3.393409\] bus_for_each_dev+0x74/0xd0 \[ 3.393754\] driver_attach+0x28/0x30 \[ 3.394076\] bus_add_driver+0x124/0x240 \[ 3.394421\] driver_register+0x7c/0x124 \[ 3.394765\] __platform_driver_register+0x4c/0x54 \[ 3.395181\] rfkill_wlan_init+0x3c/0x44 \[ 3.395525\] rfkill_rk_init+0x2c/0x48 \[ 3.395849\] do_one_initcall+0x60/0x26c \[ 3.396195\] kernel_init_freeable+0x270/0x2e0 \[ 3.396585\] kernel_init+0x18/0x114 \[ 3.396897\] ret_from_fork+0x10/0x24
2，查看PC指针
查看rfkill_wlan_probe+0x518/0x63c处挂死，可以看出具体问题哦在rfkill_wlan_probe函数
3，查看代码符号表地址 nm vmlinux | grep rfkill_wlan_probe
ffffffc0094bc5c8 t rfkill_wlan_probe
4，分析代码，查看挂死在哪一行代码
lark@ubuntu:~/Public/rk356x-linux/rk356x-linux/prebuilts/gcc/linux-x86/aarch64/gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu/bin$ ./aarch64-none-linux-gnu-addr2line -e ../../../../../../../rk356x-linux/kernel/vmlinux ffffffc0094bc5c8 -f -C
生成结果
rfkill_wlan_probe
rfkill-wlan.c:861
可以查看到
pdata = NULL;
if (!pdata->mregulator.power_ctrl_by_pmu)
可以看到代码pdata为空指针后继续使用。
补充：addr2line 没有抓到相应的符号表，如果查看符号表
(1) gcc/aarch64-none-linux-gnu-gcc编译的时候加上-g
(2) strip 命令从 XCOFF 对象文件中有选择地除去行号信息、重定位信息、调试段、typchk 段、注释段、文件头以及所有或部分符号表。
strip // Discard symbols from object files.
--strip-all //Remove all symbols.
--strip-debug //Remove debugging symbols only.
makefile举例说明：
package: $(EXECUTABLE)
保留调试信息
objcopy --only-keep-debug (EXECUTABLE)(DEBUGFILE)
剥离可执行文件中的符号信息
strip --strip-debug --strip-unneeded $(EXECUTABLE)
添加调试链接到可执行文件
objcopy --add-gnu-debuglink=(DEBUGFILE)(EXECUTABLE)