hello alpyildirim97,
it’s register during kernel initial stage, you might see below from dmesg
for example,
nvidia@nvidia-desktop:~$ dmesg | grep UART
[ 1.042539] 70006040.serial: ttyTHS1 at MMIO 0x70006040 (irq = 64, base_baud = 0) is a TEGRA_UART
[ 1.042933] 70006200.serial: ttyTHS2 at MMIO 0x70006200 (irq = 65, base_baud = 0) is a TEGRA_UART
here’s a similar discussion thread you may also check, Topic 153941 for reference.
thanks