This uniformizes Fomu target with others, provide a simple example of LiteX SoC
on Fomu and will ease maintenance.

Add initial support for Trenz TEC0117 board

orangecrab: Fix r0.1 user_led mapping

crosslink_nx_evn: Improve documentation on UART jumpers

On r0.1, all three user_leds are mapped to the same pin.
Fix this by mapping them to the pins connected to the individual
channels of the RGB LED, to match the comments, the schematics, and the
spirit of r0.2.

Untested on real hardware (I have r0.2 only).

Fixes: c94cbae0 ("orangecrab: add user_led (RGB leds), DFUProg and --load support.")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Using https://github.com/d953i/Custom_Part_Data_Files/blob/master/Boards/Xilinx_BCU1525/BCU1525_DIMMx.xdc

Using https://github.com/d953i/Custom_Part_Data_Files/blob/master/Boards/Xilinx_BCU1525/BCU1525_DIMM0.xdc.

Signed-off-by: David Shah <dave@ds0.me>

alveo_u250: Add PCIe x4 support

Add support for 5A-75E V6.0 board

Based on the implementation in xcu1525

Signed-off-by: David Shah <dave@ds0.me>

- disable DQ termination.
- disable RTT_NOM.
- drive VCCIO/GND pads.

Reduce current from 0.25A to 0.12A with: ./orangecrab.py --uart-name=usb_acm --sys-clk-freq=48e6.
Still working at 96MHz, 0.17A with: ./orangecrab.py --uart-name=usb_acm --sys-clk-freq=96e6.

See https://github.com/enjoy-digital/litedram/issues/216.