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In the kernel build, allocate the stacks for kernel threads from the kernel heap so that they are protected from medddling by the applications

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Fix a FAT error when trying to create file in a non-existent directory. Reported by Andrew Tridgell.

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Directories where the same source files are used to build different objects need to keep those objects in separate directories; LPC17xx updates from Chris Taglia

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In KERNEL mode, need to explicitly set the privilege in the CONTROL register on return from exceptions

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Reorganize some AT91SAM3U files; Add an NSH kernel build configuration to the WaveSahhare Open1788 board

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Remove user_map.h; replace with a header at the beginning of the user-space blob.  User work queue no started by os_brinup() on behalf of the application

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AT91SAM3 now supports kernel-mode heap; SAM3U-EK knsh configuration converted to use kconfig-frontends tool

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Move all memory manager globals to a structure.  Pass structure pointer as a handler because MM APIs

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Fix some bad syscall dispatching log.  This change is not testable until these is a tested NuttX kernel build.

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Move work queue logic from sched/ to libc/wqueue.  It is not core logic and will be extended to support user-space work queues

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