I am using Debian 8.3 (BeagleBone, BeagleBone Black, Seeed BeagleBone 
Green, Arrow BeagleBone Black Industrial - 4GB SD) 2016-01-24 
<https://debian.beagleboard.org/images/bone-debian-8.3-lxqt-4gb-armhf-2016-01-24-4gb.img.xz>.
 
on BBG
I have notice that the kernel load ttyS1, ttyS2 at beginning of boot. How 
can I tell the kernel stop doing that ?

[    3.493238] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 158, 
base_baud = 3000000) is a 8250

[    4.355083] console [ttyS0] enabled

[    4.359739] 48022000.serial: ttyS1 at MMIO 0x48022000 (irq = 159, 
base_baud = 3000000) is a 8250

[    4.369593] 48024000.serial: ttyS2 at MMIO 0x48024000 (irq = 160, 
base_baud = 3000000) is a 8250

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