sched/clock/clock_systimer.c:  Change the way that the 64-bit time is sampled.  Previously, we disabled interrupts before sampling the 64-bit timer since the uint64_t access is not atomic on most CPUs.  However, disabling (local) interrupts does not work in the SMP case.  In that case, the timer interrupt will be running on only one of the CPUs; disabling interrupts on a different CPU will provide no protection from timer rollover.  To work around this, logic was added that samples 64-bit timer is sampled twice and if 32-bit rollover was detected between samples, then loops until there is no rollover.

clock_systimer: Replace critical section APIs with spinlock APIs. (64bit only)

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

If SMP=n or SMP=y && SPINLOCK_IRQ=n, this works in the same way as before.
If SMP=y && SPINLOCK_IRQ=y, performance will be improved.

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

Master

* stm32f33xxx_hrtim.h: fix some definitions

* stm32_hrtim: fix some bugs

    stm32_hrtim: fix deadtime configuration

    stm32_hrtim: add interface to change outputs SET/RST configuration

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

arch/arm/src/lpc54xx:  The basic SPI driver is code complete but still untested.  This driver is 'basic' in that in only supports polled mode operations.

arch/arm/src/lpc54xx:  Add configuration logic to the empty SPI driver.  Still missing all data tranfer logic.

SAMD External Interrupt Controller (EIC) support

* SAMD External Interrupt Controller (EIC) support

* removed comment

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

SAMDL fix g_spi2ops and g_spi2dev using incorrect values

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

arch/arm/src/samdl: In sam_spibus_initialize(), the pinmux configuration was smashing the previous CTRLA register configuration. There are also some typos in samd_spi.h

lc823450 dvfs

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

Apply the latest Kconfig to all configurations.
Enable DVFS in audio and rndis. Add telnet character mode to rndis.

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

Add notes on DVFS (Dynamic Voltage and Frequencey Scaling)

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

This version only supports manual mode and Vdd1 is fixed to 1.2V.

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

drivers/net: Add support for telnet character mode

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

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

    configs/flipnclick-pic32mz:  Switch the serial console to UART4.  Clean up some minor issues the LED options.
    configs/flipnclick-pic32mz:  Add support for two on-board buttons:  T1 and T2.
    configs/flipnclick-pic32mz:  Adds basic board support for the Mikroe Flip&Click PIC32MZ board.  Initial commit is just the configs/pic32mz-starterkit with some name chanages.

    arch/mips/src/pic32mz:  Commits the basic architecture port for the PIC32MZEF.
    arch/mips/src/pic32mz:  Begin adding PIC32MZEF files. Initial commit are simply PIC32MZEC files with name changes.
    arch/mips/include/pic32mz:  Add support for the PIC32MZEF family.

    configs/flipnclick-sam3x:  Add support for the 4 user-controllable LEDs on the board.
    configs/flipnclick-sam3x:  Add board support for the Mikroe Flip&Click SAM3X.
    configs/arduino-due:  Update this old configuration so that it is structured a little more like recent board support.

    fs/nxffs:  Giving up on truncate() support in NXFFS for now.  There is too much that has to be done to make that work.
    configs/sim:  Add support for testing NXFFS.

    fs/smartfs:  Add logic needed to ftruncate to shrink a file to any arbitrary size.
    fs/smartfs:  Repartition some functionality to better fit in new ftruncate features.

FAT. Effectively handles the situation when a new file position is within the current sector.

* Find begin of the next token

* EOL

* revert

* Accelerates the work of the FS with a multitude of operations to write small pieces of data within the current sector.

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