The v1.2.3 version is a bug fixed version, which includes following change:

BSP:

• beaglebone, fix serial setting issue;
• lpc176x, add SD card driver block geometry information;
• lpc176x, remove the wrong RT_LWIP_TCP_SEG_NUM setting;
• lpc408x, fix GCC compiling issue;
• stm32f40x, fix UART3 setting issue;
• ARM Cortex-M0/3/4, fix spell wrong;

Components:

• DFS_NFS, fix the open issue when to open a not exist directory;
• I2C, remove the useless core lock;
• I2C, remove the useless device_init code;
• SPI, remove the useless device_init code;
• msh, add RT_USING_WORKDIR/RT_USING_HEAP condition;
• finsh, fix the FINSH_USING_HISTORY option;
• armlibc, fix the open mode issue when using fopen;
• pthreads, if attr is NULL, the default value is used in pthread_cond_init function;

Kernel:

• Remove the rt_device_init_all implementation;
• Fix the defunct_thread check issue when use optimized compiling in some CPU arch;
• Fix the race condition in memory pool;