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)