arm - gdb No such file or directory error -


update: found workaround - explained @ bottom

i'm trying remote debug program via serial port. on target machine (arm, linux) (connected host machine (windows) via serial-to-usb) connected via putty , looked ttys* in /dev directory, don't have any. have tty[num] (without s), , running:

dmesg | grep tty

as suggested here gives following:

# dmesg | grep tty kernel command line: mxc_hdmi.only_cea=0 console=ttymxc1,115200 vmalloc=400m consoleblank=0 rootwait fixrtc root=/dev/mmcblk1p1 2020000.serial: ttymxc0 @ mmio 0x2020000 (irq = 58, base_baud = 5000000) imx 21e8000.serial: ttymxc1 @ mmio 0x21e8000 (irq = 59, base_baud = 5000000) imx console [ttymxc1] enabled

so tried use ttymxc0 , ttymxc1:

gdbserver /dev/ttymxc0 ./test/main process ./test/main created; pid = 253 remote debugging using /dev/ttymxc0

and on host machine (windows 7): (edited following comments)

gdb path/on/host/main (gdb) target remote com15 com15: no such file or directory.

i see here serial broken @ gdb 6.6, have gdb 7.7.

why getting no such file or directory error?

edit 2:

although had tried renaming port com5 , didn't (same result), renamed port com2 , worked once , got out , stopped working:

(gdb) target remote com2 remote debugging using com2 ignoring packet error, continuing... malformed response offset query, qoffsets //got out (gdb) target remote com2 //tried again, didn't work com2: no such file or directory.

the difference between com2 , com15 (besides digits number) in windows device manager com2 appeared "used", , com15 (and com5) did not. when picked com2 new name, windows warned me it's being used accepted change anyway.

now cleared com ports , it's working alternately (haven't succeeded debugging yet, it's not falling on "no such file or directory" error anymore).

edit 3:

so target remote com2 responds "remote debugging using com2 , malformed response..." when i'm not connected target via putty. when connected via putty, says "com2: no such file or directory". it's port taken (by putty) , gdb can't log it.

i ended connecting tcp instead of serial line:

  • connect target internet ethernet cable
  • edit /etc/network/interfaces setup dhcp:

auto eth0

iface eth0 inet dhcp

  • run ifconfig or ip addr on target ip
  • run on target:

gdbserver [ip:port] ./path/to/executable/on/target

  • run on host:

gdb path/to/executable/on/host/compiled/to/target

(gdb) target remote [target's ip:port]

this sufficient workaround me.


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