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Previously the USB RAM size was off by a factor of two for chips that required 32-bit alignment of accesses, even though the underlying memory was 16-bits in size. This change adds an additional configuration for the access size (it still assumes that the underlying memory is 16-bits in size) and uses that to adjust the USB_RAM memory section in the linker scripts. This change also removes the default values for the USB RAM from stm32/config_chip.h because they mask issues when new chips are added. It is better for a new chip to fail to compile until these values are provided. Finally, this change introduces a common USB API header so that common code doesn't need to include the STM32 specific header. Signed-off-by: Anton Staaf <robotboy@chromium.org> BRANCH=None BUG=None TEST=make buildall -j Enable console on ryu_p2 and discovery-stm32f072 board Verify that it works on both Change-Id: Id118627f53e9e8ff1bd09fb51f1f9634ff495d19 Reviewed-on: https://chromium-review.googlesource.com/228833 Tested-by: Anton Staaf <robotboy@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org> Commit-Queue: Anton Staaf <robotboy@chromium.org>