Squashed commit of the following:
Author: Gregory Nutt <gnutt@nuttx.org>
arch/arm/src/imxrt: Add cache operations to permit the Ethernet driver to work with the D-Cache enabled, at least in write-through mode.
Author: Jake Choy <jakearcx@gmail.com>
arch/arm/src/imxrt: The Ethernet driver is now functional, at least with the D-Cache off. The final fix was for the reference clock that needs to be forced to provide and input (SION).
Author: Gregory Nutt <gnutt@nuttx.org>
Fix trivial coding standard issue.
configs/imxrt1050-evk: Correct CONFIG_RAM_SIZE in all configurations (5Kb not 5Mb). I don't believe that CONFIG_RAM_SIZE is used at all in the i.MX RT so this is as grievous an error as it seems. Also enabled built-in applications in all NSH configurations.
arch/arm/src/imxrt/imxrt_enet.c: Trivial and cosmetic.
Cosmetic update to comments.
arch/arm/src/imxrt/imxrt_enet.c: Oops.. put the PHY interrupt init hooks in the wrong place. That is a one-time initialization but imxrt_initphy() is called on each ifup.
arch/arm/src/imxrt/imxrt_enet.c: Add hooks for board-specific PHY initialization (not yet needed, but there when needed).
Remove dangling white space at the end of lines
arch/arm/src/imxrt/Kconfig: Add option for board-specific PHY initialization.
configs/imxrt1050-evk/src: Add basic logic to support PHY interrupts. Incomplete.. needs additional support in imxrt_enet.c to 1. call to initialize PHY interrupt features, and 2. IOCTL commands to access PHY registers.
configs/imxrt1050-evk/README.txt: Trivial update.
configs/imxrt1050-evk/netnsh/defconfig: Disable LED support because pins conflict with PHY. Enable device statists. Enable NSH ifup and ifdown commmands
arch/arm/src/imxrt: Use macros in imxrt_periphclks.h vs. direct CCM CCGR accesses in Ethernet driver.
arch/arm/src/imxrt: Misc changes for a clean compilation of Ethernet deriver. configs/imxrt1050-evk/netnsh: Add an NSH configuration for testing Ethernet.
Author: Jake Choy <jakearcx@gmail.com>
arch/arm/src/imxrt: Initial WIP Ethernet driver.
