linguini1 opened a new issue, #16444:
URL: https://github.com/apache/nuttx/issues/16444
### Description / Steps to reproduce the issue
The USART0 serial console does not work on ATMega2560 chips.
To reproduce:
```console
$ ./tools/configure.sh arduino-mega2560:nsh
$ make -j
```
flash the image to the Arduino Mega2560 board.
Connect a USB-to-serial cable to pins 0 & 1 (RX0 & TX0) and GND. Observe no
serial output at a baud rate of 38400, nor response to any input. Reboot the
board with the serial monitor still connected and see the same thing again.
If you add `avr_lowputc` calls in the board initialization code, you'll see
that the `TX` LED stays stuck on indefinitely.
### On which OS does this issue occur?
[OS: Linux]
### What is the version of your OS?
Linux 6.14.6-arch1-1 SMP PREEMPT_DYNAMIC x86_64 GNU/Linux
### NuttX Version
master
### Issue Architecture
[Arch: avr]
### Issue Area
[Area: Specific Peripheral]
### Host information
NuttX CFLAGS:
-fno-common
-Wall
-Wstrict-prototypes
-Wshadow
-Wundef
-Wno-attributes
-Wno-unknown-pragmas
-O2
-fno-strict-aliasing
-fomit-frame-pointer
-mmcu=atmega2560
-isystem /home/linguini/coding/nuttx-space/nuttx/include
-D__NuttX__
-DNDEBUG
NuttX CXXFLAGS:
-fno-common
-Wall
-Wshadow
-Wundef
-Wno-attributes
-Wno-unknown-pragmas
-nostdinc++
-fno-exceptions
-fcheck-new
-fno-rtti
-O2
-fno-strict-aliasing
-fomit-frame-pointer
-mmcu=atmega2560
-isystem /home/linguini/coding/nuttx-space/nuttx/include/cxx
-isystem /home/linguini/coding/nuttx-space/nuttx/include
-D__NuttX__
-DNDEBUG
NuttX LDFLAGS:
-mavr6
-Map=/home/linguini/coding/nuttx-space/nuttx/nuttx.map
-nostdlib
NuttX configuration options:
CONFIG_DEFAULT_SMALL=y
CONFIG_HOST_LINUX=y
CONFIG_APPS_DIR=\../apps\
CONFIG_BASE_DEFCONFIG=\arduino-mega2560:hello\
CONFIG_BUILD_FLAT=y
CONFIG_INTELHEX_BINARY=y
CONFIG_OUTPUT_STRIP_PATHS=y
CONFIG_ARCH_NONE_DEBUG_H=y
CONFIG_FORTIFY_SOURCE=0
CONFIG_NDEBUG=y
CONFIG_DEBUG_ALERT=y
CONFIG_ARCH_HAVE_STACKCHECK=y
CONFIG_STACK_USAGE_WARNING=0
CONFIG_DEBUG_SYMBOLS=y
CONFIG_DEBUG_SYMBOLS_LEVEL=\-g\
CONFIG_ARCH_HAVE_CUSTOMOPT=y
CONFIG_DEBUG_FULLOPT=y
CONFIG_LTO_NONE=y
CONFIG_DEBUG_LINK_MAP=y
CONFIG_ARCH_AVR=y
CONFIG_ARCH=\avr\
CONFIG_ARCH_FAMILY=\avr\
CONFIG_ARCH_CHIP=\atmega\
CONFIG_ARCH_CHIP_ATMEGA=y
CONFIG_ARCH_FAMILY_AVR=y
CONFIG_AVR_LINUXGCC_TOOLCHAIN=y
CONFIG_AVR_HAS_RAMPZ=y
CONFIG_ARCH_CHIP_ATMEGA2560=y
CONFIG_AVR_USART0=y
CONFIG_ARCH_TOOLCHAIN_GNU=y
CONFIG_ARCH_TOOLCHAIN_GCC=y
CONFIG_ARCH_NOINTC=y
CONFIG_ARCH_STACKDUMP=y
CONFIG_ARCH_STACKDUMP_MAX_LENGTH=0
CONFIG_BOARD_LOOPSPERMSEC=800
CONFIG_ARCH_HAVE_INTERRUPTSTACK=y
CONFIG_ARCH_INTERRUPTSTACK=0
CONFIG_BOOT_RUNFROMFLASH=y
CONFIG_RAM_START=0x800100
CONFIG_RAM_SIZE=8192
CONFIG_FLASH_START=0x0
CONFIG_FLASH_SIZE=0
CONFIG_ARCH_BOARD_ARDUINO_MEGA2560=y
CONFIG_ARCH_BOARD=\arduino-mega2560\
CONFIG_BOARD_CRASHDUMP_NONE=y
CONFIG_BOARD_MEMORY_RANGE=\\
CONFIG_DISABLE_OS_API=y
CONFIG_DISABLE_POSIX_TIMERS=y
CONFIG_DISABLE_PTHREAD=y
CONFIG_DISABLE_MQUEUE=y
CONFIG_DISABLE_MQUEUE_SYSV=y
CONFIG_DISABLE_ENVIRON=y
CONFIG_USEC_PER_TICK=10000
CONFIG_TIMER_ADJUST_USEC=0
CONFIG_START_YEAR=2011
CONFIG_START_MONTH=6
CONFIG_START_DAY=16
CONFIG_IRQ_NWORKS=8
CONFIG_IRQ_WORK_SECTION=\\
CONFIG_IRQ_WORK_STACKSIZE=2048
CONFIG_INIT_ENTRY=y
CONFIG_INIT_ARGS=\\
CONFIG_INIT_STACKSIZE=128
CONFIG_INIT_PRIORITY=100
CONFIG_INIT_ENTRYPOINT=\hello_main\
CONFIG_INIT_ENTRYNAME=\hello_main\
CONFIG_RR_INTERVAL=0
CONFIG_TASK_NAME_SIZE=0
CONFIG_SCHED_CPULOAD_NONE=y
CONFIG_SCHED_CPULOAD_TICKSPERSEC=100
CONFIG_SCHED_PROFILE_TICKSPERSEC=1000
CONFIG_SCHED_STACK_RECORD=0
CONFIG_DEV_CONSOLE=y
CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=4
CONFIG_SIG_PREALLOC_ACTIONS=4
CONFIG_SIG_ALLOC_ACTIONS=1
CONFIG_SIG_PREALLOC_IRQ_ACTIONS=4
CONFIG_DEFAULT_TASK_STACKSIZE=2048
CONFIG_IDLETHREAD_STACKSIZE=128
CONFIG_PTHREAD_STACK_MIN=128
CONFIG_PTHREAD_STACK_DEFAULT=128
CONFIG_PID_INITIAL_COUNT=8
CONFIG_DEV_OPTEE_NONE=y
CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
CONFIG_SERIAL=y
CONFIG_SERIAL_CONSOLE=y
CONFIG_MCU_SERIAL=y
CONFIG_STANDARD_SERIAL=y
CONFIG_SERIAL_NPOLLWAITERS=4
CONFIG_USART0_SERIAL_CONSOLE=y
CONFIG_USART0_SERIALDRIVER=y
CONFIG_USART0_RXBUFSIZE=256
CONFIG_USART0_TXBUFSIZE=256
CONFIG_USART0_BAUD=38400
CONFIG_USART0_BITS=8
CONFIG_USART0_PARITY=0
CONFIG_USART0_2STOP=0
CONFIG_SYSLOG=y
CONFIG_SYSLOG_DEFAULT_MASK=0xff
CONFIG_SYSLOG_CRLF=y
CONFIG_SYSLOG_MAX_CHANNELS=1
CONFIG_SYSLOG_DEVPATH=\/dev/ttyS1\
CONFIG_SYSLOG_DEFAULT=y
CONFIG_CONSOLE_SYSLOG=y
CONFIG_DISABLE_MOUNTPOINT=y
CONFIG_FS_NEPOLL_DESCRIPTORS=8
CONFIG_FS_LOCK_BUCKET_SIZE=0
CONFIG_DISABLE_PSEUDOFS_OPERATIONS=y
CONFIG_SENDFILE_BUFSIZE=512
CONFIG_FS_BACKTRACE=0
CONFIG_NXFONTS_PACKEDMSFIRST=y
CONFIG_MM_DEFAULT_MANAGER=y
CONFIG_MM_DEFAULT_ALIGNMENT=8
CONFIG_MM_SMALL=y
CONFIG_MM_REGIONS=1
CONFIG_MM_MAP_COUNT_MAX=1024
CONFIG_MM_BACKTRACE=-1
CONFIG_MM_FREE_DELAYCOUNT_MAX=0
CONFIG_MM_HEAP_BIGGEST_COUNT=30
CONFIG_MM_HEAP_MEMPOOL_THRESHOLD=-1
CONFIG_BINFMT_DISABLE=y
CONFIG_BINFMT_ELF_RELOCATABLE=y
CONFIG_STDIO_BUFFER_SIZE=0
CONFIG_STDIO_LINEBUFFER=y
CONFIG_NUNGET_CHARS=0
CONFIG_ARCH_LOWPUTC=y
CONFIG_LIBC_RAND_ORDER=1
CONFIG_LIBC_HOMEDIR=\/\
CONFIG_LIBC_TMPDIR=\/tmp\
CONFIG_LIBC_MAX_TMPFILE=32
CONFIG_LIBC_MAX_EXITFUNS=0
CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE=2048
CONFIG_LIBC_HOSTNAME=\\
CONFIG_LIBC_OPEN_MAX=256
CONFIG_NAME_MAX=32
CONFIG_PATH_MAX=256
CONFIG_LINE_MAX=64
CONFIG_LIBC_STRSIGNAL=y
CONFIG_LIBC_STRSIGNAL_SHORT=y
CONFIG_TLS_TASK_NELEM=0
CONFIG_TLS_NCLEANUP=0
CONFIG_LIBC_GAISTRERROR_ERRNUM=y
CONFIG_LIBC_FTOK_VFS_PATH=\/var/ftok\
CONFIG_LIBC_MEMFD_ERROR=y
CONFIG_LIBC_MUTEX_BACKTRACE=0
CONFIG_STREAM_OUT_BUFFER_SIZE=64
CONFIG_STREAM_HEXDUMP_BUFFER_SIZE=128
CONFIG_STREAM_BASE64_BUFFER_SIZE=128
CONFIG_LIBM_NONE=y
CONFIG_BUILTIN_TOOLCHAIN=y
CONFIG_COVERAGE_NONE=y
CONFIG_COVERAGE_DEFAULT_PREFIX_STRIP=\99\
CONFIG_COVERAGE_DEFAULT_PREFIX=\/data\
CONFIG_PROFILE_NONE=y
CONFIG_EXAMPLES_HELLO=y
CONFIG_EXAMPLES_HELLO_PROGNAME=\hello\
CONFIG_EXAMPLES_HELLO_PRIORITY=100
CONFIG_EXAMPLES_HELLO_STACKSIZE=2048
Host system OS:
Linux pastabox 6.14.6-arch1-1 #1 SMP PREEMPT_DYNAMIC Fri 09 May 2025
17:36:18 +0000 x86_64
Host system PATH:
/home/linguini/.cargo/bin
/sbin
/bin
/usr/local/sbin
/usr/local/bin
/usr/sbin
/usr/bin
/opt/cuda/bin
/opt/cuda/nsight_compute
/opt/cuda/nsight_systems/bin
/usr/lib/jvm/default/bin
/usr/bin/site_perl
/usr/bin/vendor_perl
/usr/bin/core_perl
/opt/rocm/bin
/usr/lib/rustup/bin
### Verification
- [x] I have verified before submitting the report.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
