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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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Add support for the Atollic Pro toolchain; Change extension .ihx to .hex to be better compatible with most of the rest of the world

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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 quad encoder: Don't calculate the timer prescaler value at runtime; pre-calculate it at compiler time

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(1) Fix a critical memory leak in the TCP read-ahead buffering logic; Add an option to suppress SDIO multi-block transfers in order to work around a buggy SDIO driver

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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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