STM32: Remove one residual use of the obsoleted STM32_TIM27_FREQUENCY definition which does not work for all STM32 family members.

Most Ethernet drviers:  Check if the poll timer is running before restarting it at the end of each TX.

sigtimedwait: When timer expires, up_unblock_task() is called.  This is okay in the single CPU case because interrupts are disable in the timer interrupt handler.  But it is insufficient in the SMP case.  enter_ and leave_critical_section() must be called in order to manage spinlocks correctly.

kinetis_enet.c add #define for number of loops for auto negotiation to complete

Approved-by: Gregory Nutt

twr-k64f120m: refresh configurations.  DEBUG must be disabled in all base configurations.  CONFIG_APPS_DIR must must be defined in defconfig files.

drivers/spi/Kconfig: There is too much SPI in the configuration menu; SPI Driver Support menu is empty

Olimex STM32 p407:  Add extrnal SRAM support.  Unfortunately not usable or testable unless you also disable the serial console.

Upstream kinetis SIM, PMC

Approved-by: Gregory Nutt

  The warning has been added because: SIM_SOPT2_PLLFLLSEL
  is a clock selection that may feed many clock subsystem:
   USB, TPM, SDHCSRC, LPUARTSRC. Therefore, there needs to
  be a global board level setting to select  the source for
  SIM_SOPT2_PLLFLLSEL and then  derive all the  sub selections
  and proper fractions/divisors for each modules clock.

   ACKISO is located in the PMC_REGSC on the majority
   of the Kinetis SoCs. With the exception of the
   MK40DXxxxZVLQ10 where ACKISO is located in LLWU_CS

  ACKISO is located in the PMC_REGSC on the majority
  of the Kinetis SoCs. With the exception of the
  MK40DXxxxZVLQ10 where ACKISO is located in LLWU_CS

     The motvations is to version the IP blocks of the Kinetis
     K series family of parts.

     This added versioning and configuration features for the
     Kinetis PMC IP block.

     It is envisioned that in the long term as a chip is added.
     The author of the new chip definitions will either find
     the exact configuration in an existing chip define and
     add the new chip to it Or add the PMC fature configuration
     #defines to the chip ifdef list in
     arch/arm/include/kinetis/kinetis_pmc.h  In either case the
     author should mark it as "Verified to Document Number:"
     taken from the reference manual.

     The version KINETIS_PMC_VERSION_UKN has been applied to
     most all the SoCs in the kinetis arch prior to this commit.

     The exceptions are the CONFIG_ARCH_CHIP_MK60FN1M0VLQ12,
     CONFIG_ARCH_CHIP_MK20DXxxxVLH7 All K64 and K66 have ben
     Verified PMC configurations.

   The motvations is to version the IP blocks of the Kinetis
   K series family of parts.

   This added versioning and configuration features for the
   Kinetis SIM IP block.

   It is envisioned that in the long term as a chip is added.
   The author of the new chip definitions will either find
   the exact configuration in an existing chip define and
   add the new chip to it Or add the SIM feature configuration
   #defines to the chip ifdef list in
   arch/arm/include/kinetis/kinetis_sim.h  In either case the
   author should mark it as "Verified to Document Number:"
   taken from the reference manual.

   The version KINETIS_SIM_VERSION_UKN has been applied to
   most all the SoCs in the kinetis arch prior to this commit.

   The exceptions are the CONFIG_ARCH_CHIP_MK60FN1M0VLQ12,
   All K64 and K66 which not have Verified SIM configurations.

fstatfs: Rethink last commit.  Add verification that the file descriptor refers to an open file.  This also should eliminate the warning while doing something useful.

Fixes warning and file name

Approved-by: Gregory Nutt

Removed CONFIG_LIBC_ARCH_BZERO.  bzero() is a deprecated interface.  There are no architecture-specific replacements and, if there were, they should replace memset(), not bzero().