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Revise recent changes to serial driver error handling:  Errors other than EINTR may be returned when the driver is used very early in initialization.  STM32 SPI driver will now survive repeated initializations

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Back out the last STM32 DMA priority change.  It is not necessary; just dropping the SD frequency was sufficient

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Update documentation to describe customization of NSH; Add the framework for a LPC43xx USB0 driver (not functional)

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Move RAMLOG driver to drivers/syslog; Add ability to output debug information to any character device or file

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LPC17xx serial now supports minimal termios ioctls; serial driver ioctl methods should not set errno variable

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