I have cubieboard2 nand chinese usb-modbus stik with ch340 chip.
when I connet ch340 chip to usb cubieboard is freezed, ttyS0 is blocked. cubieboard is work but is very very slow, ssh is not disconnected but don't answer by my command.
when I disconnect ch340 chip cubieboard will bee unfrozen but ttyS0 is blocked until I don't make hard (power) reset. Software reset is not unfroze ttyS0.
I cannot found src for ch340 chip diver. Driver from china web is not compiling.
uname -a
Linux cubieboard2 4.14.18-sunxi #31 SMP Fri Feb 9 11:11:15 CET 2018 armv7l GNU/Linux
dmesg
[ 1129.203974] usb 4-1: new full-speed USB device number 4 using ohci-platform
[ 1129.478105] usb 4-1: New USB device found, idVendor=1a86, idProduct=7523
[ 1129.478120] usb 4-1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 1129.478126] usb 4-1: Product: USB2.0-Serial
[ 1129.480407] ch341 4-1:1.0: ch341-uart converter detected
[ 1129.493385] usb 4-1: ch341-uart converter now attached to ttyUSB0
[ 1210.401005] usb 4-1: USB disconnect, device number 4
[ 1210.402338] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
[ 1210.402462] ch341 4-1:1.0: device disconnected
lsmod
odule Size Used by
cfg80211 376832 0
rfkill 20480 2 cfg80211
sun4i_gpadc_iio 16384 0
8188eu 589824 0
sun4i_ts 16384 0
sun4i_codec 32768 3
ch341 16384 0
snd_soc_core 118784 1 sun4i_codec
usbserial 24576 1 ch341
ir_lirc_codec 16384 0
evdev 20480 1
lirc_dev 16384 1 ir_lirc_codec
snd_pcm_dmaengine 16384 1 snd_soc_core
snd_pcm 65536 2 snd_pcm_dmaengine,snd_soc_core
snd_timer 24576 1 snd_pcm
snd 45056 3 snd_timer,snd_soc_core,snd_pcm
soundcore 16384 1 snd
sun4i_gpadc 16384 0
nvmem_sunxi_sid 16384 0
sunxi_cir 16384 0
sun4i_ss 24576 0
uio_pdrv_genirq 16384 0
uio 16384 1 uio_pdrv_genirq
bonding 94208 0
fuse 73728 1
Any help or suggestion?
Thanks,
Vlad
