Hi. So this two devices is 3.3 volts tolerance. The Jetson I2C-1 bus already haves pull-ups resistors. If you use DS3231 and bmp180 assembled on PCB modules, these modules also can have i2c-bus pull-ups resistors and that can cause an i2c issue. If yes, simply desolder pull-up resistors from DS3231 and bmp180 modules boards.
If you luck in " ls /dev", in this directory must be present 6 i2c buses “i2c-0, i2c-1…”. If this files is missing, you need to reconfigure and reflash the kernel.
As I already wrote, the hardware modules and their drivers work fine (I wrote my own iio driver for the pressure sensor bmp180), but I’m searching for a way to start them without the ‘echo’ command. For example as parameters 'i2c_bus=1 addr=0x0068" to the module “rtc_ds3232”, if the driver is compiled as module or as parameters to the kernel.