I can't see the output using the minicom when flash on STM32F429IGT6

[guanyuqian]

I flash zephyr on STM32F429IGT6 follow the zephyr document ST STM32F4DISCOVERY
using the ninja flash the output on pc is

[0/1] Flashing stm32f4_disco
Using runner: openocd
Open On-Chip Debugger 0.10.0-g7852ae77-dirty (2018-05-11-23:26)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
adapter speed: 2000 kHz
adapter_nsrst_delay: 100
none separate
srst_only separate srst_nogate srst_open_drain connect_deassert_srst
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
Info : clock speed 1800 kHz
Info : STLINK v2 JTAG v28 API v2 SWIM v6 VID 0x0483 PID 0x3748
Info : using stlink api v2
Info : Target voltage: 3.163279
Info : stm32f4x.cpu: hardware has 0 breakpoints, 0 watchpoints
    TargetName         Type       Endian TapName            State       
--  ------------------ ---------- ------ ------------------ ------------
 0* stm32f4x.cpu       hla_target little stm32f4x.cpu       running
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
adapter speed: 1800 kHz
target halted due to debug-request, current mode: Thread 
xPSR: 0x01000000 pc: 0x08001884 msp: 0x20000698
auto erase enabled
Info : device id = 0x20016419
Info : flash size = 1024kbytes
Info : Single Bank 1024 kiB STM32F42x/43x/469/479 found
target halted due to breakpoint, current mode: Thread 
xPSR: 0x61000000 pc: 0x20000046 msp: 0x20000698
wrote 16384 bytes from file /home/the_sam/github/zephyr/samples/hello_world/build/zephyr/zephyr.bin in 1.083493s (14.767 KiB/s)
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
adapter speed: 1800 kHz
target halted due to debug-request, current mode: Thread 
xPSR: 0x01000000 pc: 0x08001884 msp: 0x20000698
verified 11892 bytes in 0.177110s (65.571 KiB/s)
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
adapter speed: 1800 kHz
shutdown command invoked

Is it show success?

but when I use the minicon to observed the "hello world" output ,I found nothing
$ minicom -D /dev/ttyACM0

I flash other program (ucos3) on my board , the result will show in the mincon console.

I use ninja debug,the terminal show

Using runner: openocd
Open On-Chip Debugger 0.10.0-g7852ae77-dirty (2018-05-11-23:26)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
adapter speed: 2000 kHz
adapter_nsrst_delay: 100
none separate
srst_only separate srst_nogate srst_open_drain connect_deassert_srst
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
Info : Unable to match requested speed 2000 kHz, using 1800 kHz
Info : clock speed 1800 kHz
Info : STLINK v2 JTAG v28 API v2 SWIM v6 VID 0x0483 PID 0x3748
Info : using stlink api v2
Info : Target voltage: 3.168000
GNU gdb (GDB) 7.11.0.20160511-git
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
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Type "apropos word" to search for commands related to "word"...
Reading symbols from /home/the_sam/github/zephyr/samples/hello_world/build/zephyr/zephyr.elf...done.
Info : stm32f4x.cpu: hardware has 0 breakpoints, 4 watchpoints
    TargetName         Type       Endian TapName            State       
--  ------------------ ---------- ------ ------------------ ------------
 0* stm32f4x.cpu       hla_target little stm32f4x.cpu       running
Remote debugging using :3333
Info : Halt timed out, wake up GDB.
Error: timed out while waiting for target halted

Remote communication error.  Target disconnected.: Connection reset by peer.
(gdb) 

why I can't debug and see the output,anyone can help me ?thx

[guanyuqian]

zephyr don't support this board,I changed board.