CODEWITHSUNDEEP
linuxputtyraspberry-pi2uart
john s.
john s.

Reputation: 517

Trouble using TTL serial USB converter with CP2102

I bought a serial TTL to USB converter for monitoring my raspberry, but got stuck while booting. My OS is Ubuntu 14.04 with kernel 4.4.6

http://www.amazon.de/USB-TTL-Konverter-Modul-mit-eingebautem-CP2102/dp/B00AFRXKFU?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00

(RaspberryPi with raspbian)

nano /boot/cmdline.txt
dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 rootflags=commit=120  elevator=deadline noatime nodiratime fsck.repair=yes data=writeback rootwait

Driver is working fine.

lsusb
Bus 002 Device 006: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x UART Bridge / myAVR mySmartUSB light

logging:

dmsg
[19265.407597] usb 2-1.2: New USB device found, idVendor=10c4, idProduct=ea60
[19265.407603] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[19265.407606] usb 2-1.2: Product: CP2102 USB to UART Bridge Controller
[19265.407609] usb 2-1.2: Manufacturer: Silicon Labs
[19265.407612] usb 2-1.2: SerialNumber: 0001
[19265.408610] cp210x 2-1.2:1.0: cp210x converter detected
[19265.408791] usb 2-1.2: cp210x converter now attached to ttyUSB1

connecting wires:

starting putty: sudo putty settings:

Serial terminal shows only one line and get stops working:

Uncompressing Linux... done, booting the kernel.

No more text.. and I can not press any key.

Any suggestion, how to fix this?

Upvotes: 1

Views: 3094

Answers (1)

krb
krb

Reputation: 16325

Try using console=ttyAMA0,115200 instead. Assuming your serial adapter is connected correctly (judging from the early lines, it is), you have just configured the console bootarg incorrectly.

To elaborate, the reason you get that one line is because the early bootcode doesn't care about the console bootarg, it'll write that line using a small UART driver embedded in the decompressor routine.

Upvotes: 2

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