Reply To: BerryGPS-IMU v4 No signal

[digitaltopo]

$ 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 bcm2708_fb.fbwidth=480 bcm2708_fb.fbheight=640 bcm2708_fb.fbswap=1 smsc95xx.macaddr=B8:27:EB:DB:94:CB vc_mem.mem_base=0x1ec00000 vc_mem.mem_size=0x20000000 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait fbcon=map:10 fbcon=font:ProFont6x11
[ 0.001264] printk: console [tty1] enabled
[ 3.237658] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 114, base_baud = 0) is a PL011 rev2
[ 3.255236] 3f215040.serial: ttyS0 at MMIO 0x3f215040 (irq = 86, base_baud = 50000000) is a 16550
[ 6.006399] systemd[1]: Created slice system-getty.slice.
[ 40.405065] input: Kano keyboard Keyboard as /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hci0/hci0:11/0005:0A5C:8502.0001/input/input1
[ 40.406484] input: Kano keyboard Mouse as /devices/platform/soc/3f201000.serial/tty/ttyAMA0/hci0/hci0:11/0005:0A5C:8502.0001/input/input2

$ stty -a -F /dev/serial0:

speed 9600 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
werase = ^W; lnext = ^V; discard = ^O; min = 1; time = 0;
-parenb -parodd -cmspar cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff
-iuclc -ixany -imaxbel -iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
echoctl echoke -flusho -extproc

$ grep uart /boot/config.txt:

enable_uart=1