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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