Enhance the stm32_dmacapable implementation to give correct answers.
Fix the Kconfig configuration for the STM32 SDIO DMA priority option.
Teach the STM32 SDIO driver how to determine whether a transfer can be performed safely using DMA.
Teach the MMC layer to handle errors reported during DMA setup.
Teach the FAT filesystem how to deal with I/Os that can't be handled due to DMA non-conformability.
Fix DMA channel definitions for UART7/8
Add an explicit preflight call for SDIO DMA operations, since we can't error out of the DMA setup (the card is already committed at that point).
Missed de-optioning the DMA preflight check.
Fixed two sscanf() issues: 1) sscanf() always reported as result value the number of wanted arguments, even if it was not able to get all of them. 2) sscanf() would return conversion success for the last argument even if the last character is a space symbol
Merge branch 'master' of github.com:PX4/NuttX
Cover a range of sscanf() corner cases, including %n not being the last format specifier and trailing characters after a successful number pattern. Behaves mostly now as the POSIX variant, with all tested non-error cases being exactly the same. In particular for %n the number of returned characters now matches correctly in presence of trailing whitespace.
Also consider negative values to be valid
Also consider negative values to be valid, and while we are at it add support for the full valid C99 number symbol range plus the binary numbers NuttX supports
Fix a typo that disconnected the DMA range validation checker from the actual DMA path.

Now SDIO DMA ranges are properly checked, and filesystem operations are correctly bounced when they cannot be DMA'ed.
sdio: fixed SDIO_DMAPREFLIGHT() macro to return fault code

the logical && was swallowing the -EFAULT return
strncpy bug fixed: fill tail of dest with zeroes if src size < n
Merge pull request #7 from DrTon/strncpy_fix

strncpy bug fix
Corrected pinmaps for stm32f40xxx processor
Fixes for sim for CLANG
Minor adjustment to make CLANG assembler happy