drivers/net:  Remove the old, unfinished Crystal LAN driver.  I don't even have the hardware that it goes with anymore.

Master

* stm32: add ADC DMA support to STM32F33 configuration

* stm32f33xxx_adc.c: fix compilation if no DMA

* nucleo-f334r8: eliminate warning

* nucleo-f334r8: add highpri example configuration

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Correct a problem that was causing an apparent directory to be reported as a file instead of a directory by opendir.

This happened after adding these three new procfs entries:

  fs/block
  fs/mount
  fs/usage

Of course, there is no directory fs in this case, only three files that have fs/ in their relative pathnames.  The logic was detecting that fs was the name of the enty to report, but it was then declaring that fs was a file (because fs/block is of type file).

This was fixed by adding a check for matching lenghts.  i.e., if strlen(fs) != strlen(fs/block), then report fs as a directory instead of a file.

    fs/mount:  Implements procfs /proc/fs/blocks and /proc/fs/usage files, replacing the NSH df command.
    fs/mount:  Implements procfs /proc/fs/mount file, replacing the NSH mount command when there are not arguments.
    fs/: Move prototype of foreach_mountpoint out of include/nuttx/fs/fs.h to fs/mount/mount.h.  Add framework for the mount procfs (initial commit is just a close of the net/route table procfs.

Port STM32F7 I2C driver to STM32L4

* arch/stm32l4: port STM32F7 I2C driver to STM32L4

    STM32L4 I2C driver is in work-in-progress state (plentiful of
    TODOs and #warnings) and lags many features found in more
    up-to-date STM32 I2C drivers. The peripheral on STM32F7 and
    STM32L4 are identical except for L4's 'wakeup from stop mode'
    flag and STM32F7's I2C driver is in more 'ready to use' state.

    Patch ports the STM32F7 I2C driver to STM32L4. The I2C clock
    configuration is kept the same as before (I2CCLK = PCLK1 80 Mhz)
    instead of switching to STM32F7 arch default that is I2CCLK=HSI.
    Further work would be to add configuration option for choosing
    I2C clock source instead of current hard-coded default.

* arch/arm/stm32f7: i2c: restore bus frequency after I2C reset

    Copy frequency restoration fix from STM32L4 I2C driver to STM32F7 I2C driver.

* arch/arm/stm32f7: i2c: remove unused Kconfig option

* configs/nucleo-l496zg/nsh: enable I2C4 bus with i2ctool

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Olimex stm32-h407 serial support for the on-board UEXT connector (fixed style & defconfig)

* olimex-stm32-h407: Add USART6 for UEXT connector.

* olimex-stm32-h407: nsh_uext configuration and README update.

Approved-by: Gregory Nutt <gnutt@nuttx.org>

sched: move POSIX thread specific data from pthread TCB to common TCB structure.  This change allows using pthread_getspecific/pthread_setspecific from main thread. Patch also enables using pthread data with config option CONFIG_DISABLE_PTHREAD=y.

mm/mm-heap: memalign: fix heap corruption caused by using unaligned chuck size.  Unaligned nodes generated by memalign later cause heap corruptions when nodes are shrink further (for example, 24 bytes -> 8 bytes, when alignment is 16 bytes).

This commit adds support for semi-standard IPPROTO_ICMP6 sockets.  This is a replacement for the non-standard ICMPv6 ping support that violated the portable POSIX OS interface.

Squashed commit of the following:

    net/icmpv6: IPPROT_ICMP6 socket logic now builds without error.
    net/icmpv6:  Add support for read-ahead and poll(). Initial commit is just cloned from ICMP with the appropriate name changes.
    configs/:  All defconfig filess that include CONFIG_NET_ICMPv6_SOCKET=y need to select CONFIG_SYSTEM_PING6=y and deselect CONFIG_DISABLE_POLL.
    Update NSH documention to show that ping6 is now a built in command.
    net/icmpv6:  Add icmpv6_sendto.c and icmpv6_recvfrom.c.  Initial versions are just clones from icmp/ with appropriate name changes.
    net/icmpv6:  Clone some ICMP socket logic as the beginning of support for ICMPv6 socket support.
    Rename CONFIG_NET_ICMPv6_PING to CONFIG_NET_ICMPv6_SOCKET.  Move prototype for icmpv6_ping from include/nuttx/net/icmpv6 to net/icmpv6/icmpv6.h

This change adds support for semi-standard IPPROTO_ICMP AF_INET datagram sockets.  This replaces the old ad hoc, nonstandard way of implementing ping with a more standard, socket interface.

Squashed commit of the following:

    net/icmp:  Finishes off icmp_recvfrom().
    net/icmp:  Add readahead support for IPPROTO_ICMP sockets.
    net/icmp:  Add poll() support for IPPROTO_ICMP sockets.
    net/icmp:  Add a connection structure for IPPROTO_ICMP sockets.
    net/icmp:  Implements sendto for the IPPROTO_ICMP socket.
    net/icmp:  Move icmp_sendto() and icmp_recvfrom() to separate files.  They are likely to be complex (when they are implemented).
    net/icmp:  Hook IPPROTO_ICMP sockets into network.  Fix some naming collisions.  Still missing basic ICMP send/receive logic.
    configs: apps/system/ping current need poll() enabled.
    configs: All defconfig files that use to enable low-level support must now enabled CONFIG_SYSTEM_PING.
    net/icmp:  Adds basic build framework to support IPPROTO_ICMP sockets.

stm32f103-minimum:  Add an ADPS-9960 example configuration

Master

* stm32_hrtim: fix warnings related with RCC

* stm32f33xxx_adc: add some publicly visable interfaces and some code to support injected channels

* stm32f33xxx_dma: add public interface to handle with DMA interrupts

* stm32_hrtim: change some names and add some coments

* chip/stm32f33xxx_adc.h: cosmetics

* nucleo-f334r8: add logic for zero latency high priority interrupts example

* stm32: update some ADC-related configuration in Kconfig

Approved-by: Gregory Nutt <gnutt@nuttx.org>

    fs/fat:  Remove mkfatfs from the OS.  This is a user-space application and belongs in apps, not in the OS.

drivers/bch:  The character driver to block device access now supports an IOCTL to get the geomtry of the underlying block device.

stm32_adc.c: clear pending interrupts

Approved-by: Gregory Nutt <gnutt@nuttx.org>

STM32L1, STM32L4 RTC: add periodic interrupts, update L1 RTC implementation

* STM32L4 RTC: add support experimental CONFIG_RTC_PERIODIC

* STM32 RTC: separate STM32L1 RTC into a separate file

    STM32L1 RTC is very close to F4 or L4 versions, with two alarms
    and periodic wakeup support so backported L4 peripheral to L1.

* RTC: add periodic alarms to upper and lower halves

Approved-by: Gregory Nutt <gnutt@nuttx.org>