RTEMS | bsp/arm/tms570: Board selection and EMAC MII pin fragments (!1434)

[Armaan Chowfin (@ar-in0)]

Armaan Chowfin commented on a discussion on spec/build/bsps/arm/tms570/optboardlchxl2.yml: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1434#note_157753

 > +- env-enable: null
 > +build-type: option
 > +copyrights:
 > +- Copyright (C) 2020 embedded brains GmbH & Co. KG
 > +default:
 > +- enabled-by: true
 > +  value: false
 > +description: |
 > +  If set to true, then the board specific setup selects the LAUNCHXL2-570LC43
 > +  LaunchPad wiring instead of the Hercules Development Kit (HDK) wiring.  The
 > +  two boards use the same TMS570LC4357 chip but route the EMAC MII signals to
 > +  different terminals, and the LaunchPad drives its PHY reference clock and
 > +  reset from the chip.  Only meaningful when TMS570_VARIANT is 4357.
 > +enabled-by: true
 > +links: []
 > +name: TMS570_BOARD_LCHXL2_570LC43

1. The pin mappings are now complete for the 4357. @ppisa wanted a new board option.
2. EMAC pin mappings are a  binary choice for HDK and launchpad, but `BOARD_LCHXL2` right now also controls some PHY wiring options. (ex. which clk drives PHY - `TMS570_PHY_REFCLK_ECPDIV` , PHY power down pins - `TMS570_PHY_PWRDOWN_GIOA_PIN` ). An option just for EMAC pin mappings could be a better choice.
3. A terminology note: https://www.ti.com/lit/ds/symlink/tms570lc4357.pdf?ts=1787465610186&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTMS570LC4357 table 4-29 names "default" and "alternate" terminals ("default" used by launchpad, "alternate" used by HDK).

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1434#note_157753
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