dmesg | grep tty
[    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 snd_bcm2835.enable_headphones=1 bcm2708_fb.fbwidth=0 bcm2708_fb.fbhe
ight=0 bcm2708_fb.fbswap=1 smsc95xx.macaddr=DC:A6:32:98:D1:5D vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  console=/dev/ttyS0 root=PARTUUID=97709164-02 rootfstype=ext4 elevator=deadline
fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
[    0.602392] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 29, base_baud = 0) is a PL011 rev2
[    0.606816] fe215040.serial: ttyS0 at MMIO 0x0 (irq = 30, base_baud = 62500000) is a 16550
[    2.973642] usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB0