This PCB is used in RY-8GT-1SX. The UART has swapped Rx and 3.3V VCC as
documented in `doc/devices/FG-8GT-1SX.md` so I imagine there would be
a revision later, after the current '2622' batch, like the RY-4GT-2SX /
FG-4GT-2SX_V2.0 pair from the same vendor.
- machine.c/h: add MACHINE_FNS1200P with verified GPIO assignments for
both SFP ports, LED SET0 (amber 2.5G / green 1G-100M-10M) and SET1
(SFP all-speeds), led_mux from original firmware register dump, and
machine_custom_init() enabling LED_GLB_IO_EN bit 6
- doc/devices/FNS-1200P.md: device overview, port layout, serial
console (S1 three through-holes = UART0 115200 8N1 3.3V),
LED and SFP GPIO tables
- doc/devices/photos/FNS-1200P/: chassis front panel and PCB top photos
- doc/supported_devices.md: add FNS-1200P to the list
GPIO assignments and LED register values were cross-checked between
live GPIO observation (RTLPlayground gpio command) and an original
firmware register dump.