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Extend CDC/ACM driver so that can be connected/disconnected under software control; Add new NSH commands sercon and serdis that will connect and disconnect the CDC/ACM serial device

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readline() (and hence NSH) now accept the DEL character as well as the Backspace character for the backspace functionality

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STM32 SDIO DMA:  Ignore DMA FIFO errors; these seem to be bogus. SD multiple block transfers result in CRC errors; avoid them by using smaller FTP buffer sizes

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Add David Hewson's corrections to the LPC214x USB device driver; Add LPC214x configuration to test the USB composite device

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Move lib/stdio/lib_fgets.c to apps/system/readline; simplify fgets(); use readline instead of fgets in NSH

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Add on_exit(); Re-order some logic in the task shutdown sequence.  Sometimes some complex logic needs to execute when closing file descriptors and this needs to happen early while the task is still healthy

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Get rid of psock.h (bad idea); Add logic to clone the socket structure when wrapping the telnet connection as a character driver

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