sched/init/nx_start.c: Add support for CONFIG_BOARD_DRIVER_INITIALIZE. If this option is selected then nx_start() will call a board-provided function board_driver_initialize() immediately after calling up_initialize().
Rename CONFIG_BOARD_INITIALIZE to CONFIG_BOARD_LATE_INITIALIZE.
Raname board_initialize() to board_late_initialize()
1. Move exepath_*() related code to libc/misc
1. Rename exepath_ to envpath_
2. Rename BINFMT_EXEPATH to LIB_ENVPATH
libs/libc/modlib: Add pre module library symbol table support
Author: Xiang Xiao <xiaoxiang@xiaomi.com>
arch/arm/src/armv7-m: Implement SYSTICK timer driver
Author: anchao <anchao@pinecone.net>
configs/sim/loadable: Add loadable demo for arch sim
sched/init: Restore previously reverted option to mount block device for INIT_FILEPATH case
configs/stm3240g-eval/knxwm: Fix build breakage.
Author: Gregory Nutt <gnutt@nuttx.org>
configs: With recent changes to apps/ all configurations that build applications as modules must now also select CONFIG_APPS_LOADABLE.
Author: anchao <anchao@pinecone.net>
configs/sim/loadable: Add loadable demo for arch sim
Kconfig and tools/Makefile.unix and : add dynamic application loadable support
