f1c200s tina 驱动里面加了几行炸了 ...

[ubuntu]

                x = (int)(((float)x/235.00)*400);
                y = (int)(((float)y/316.00)*240);

  CC      init/version.o
  LD      init/built-in.o
drivers/built-in.o: In function `edt_ft5x06_ts_isr':
clk-sun3iw1.c:(.text+0xe1cc4): undefined reference to `__aeabi_i2f'
clk-sun3iw1.c:(.text+0xe1cc8): undefined reference to `__aeabi_f2d'
clk-sun3iw1.c:(.text+0xe1cd4): undefined reference to `__aeabi_ddiv'
clk-sun3iw1.c:(.text+0xe1ce0): undefined reference to `__aeabi_dmul'
clk-sun3iw1.c:(.text+0xe1cfc): undefined reference to `__aeabi_i2f'
clk-sun3iw1.c:(.text+0xe1d00): undefined reference to `__aeabi_f2d'
clk-sun3iw1.c:(.text+0xe1d0c): undefined reference to `__aeabi_ddiv'
clk-sun3iw1.c:(.text+0xe1d18): undefined reference to `__aeabi_dmul'
clk-sun3iw1.c:(.text+0xe1d2c): undefined reference to `__aeabi_d2iz'
clk-sun3iw1.c:(.text+0xe1d4c): undefined reference to `__aeabi_d2iz'
Makefile:783: recipe for target 'vmlinux' failed

[uuuuid]

https://blog.csdn.net/weixin_44019461/article/details/124433194

Linux内核空间无法调用C库函数并且禁用FPU，可以放弃了。

原因：内核这么设计有利于上下文切换和调度。
解决方法
尝试过手动实现某些三角函数到我的文件中。发现只要涉及浮点数，虽然编译时不会error，但有一些warning如下：

  MODPOST 1 modules
WARNING: "__aeabi_f2d" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_fcmplt" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_fmul" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_fdiv" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_f2iz" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_fcmple" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_fcmpge" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_fsub" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_d2f" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_dmul" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_i2f" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_fcmpgt" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!
WARNING: "__aeabi_fadd" [/work/coding/1_diy/22_dts_i2c_mpu6050/mpu6050.ko] undefined!

原因是：当前使用Linux内核版本不支持ARM平台的相关运算，相同的内核代码在X86平台是没有问题的。

[uuuuid]

@ubuntu

https://github.com/OP-TEE/optee_os/blob/master/lib/libutils/isoc/arch/arm/arm32_aeabi_softfloat.c

自己加吧