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VexRiscv UART RX interrupt path corrupts input on xc7s25/openxc7; polling mode is clean

Status: Open.

#192 In openXC7/nextpnr-xilinx;

· AssassinK786 opened on Sep 11, 2026

Clock census of a LiteX SoC on VC707, and the design of a region-aware clocking pass

Status: Open.

#189 In openXC7/nextpnr-xilinx;

· cavearr opened on Sep 8, 2026

xc7: Constant fill pass leaves GND sinks unrouted, RAM32M address bit floats high

Status: Open.

#180 In openXC7/nextpnr-xilinx;

· shenki opened on Sep 7, 2026

HeAP placer: alpha/beta/criticalityExponent are hardcoded, so placerHeap/* settings are ignored

Status: Open.

#176 In openXC7/nextpnr-xilinx;

· colneech-dev opened on Sep 5, 2026

ODDR: assertion failure "s != -1" in getBelSiteRef on xc7z045 (passes on xc7z020 and xc7a100t)

Status: Open.

#175 In openXC7/nextpnr-xilinx;

· gHashTag opened on Sep 4, 2026

MMCM-fed regional buffers cannot be assembled: HCLK_CMT PERFCLK and CMT_TOP_R_LOWER_B CLK_PERF have no segbits

Status: Open.

#172 In openXC7/nextpnr-xilinx;

· gHashTag opened on Sep 1, 2026

prjxray-db: the BUFIO / regional-clock rows from 039-hclk-config exist only for artix7, a pad-fed BUFIO cannot be assembled on spartan7, zynq7 or kintex7

Status: Open.

#169 In openXC7/nextpnr-xilinx;

· cavearr opened on Aug 29, 2026

Fmax fits LUT^-0.648 (R^2=0.92) across 21 designs: MHz/LUT comparisons rank by size

Status: Open.

#166 In openXC7/nextpnr-xilinx;

· gHashTag opened on Aug 28, 2026

Parity report: himbaechel-xilinx-porting vs nextpnr-xilinx 0.9.3 on artix7/spartan7 (regression suite + LiteX DDR)

Status: Open.

#165 In openXC7/nextpnr-xilinx;

· cavearr opened on Aug 27, 2026

--placer sa produces invalid placements on xc7 (all revisions tested since 2026-07-28)

Status: Open.

#162 In openXC7/nextpnr-xilinx;

· cavearr opened on Aug 25, 2026

LUT route-through arcs missing: the carry packer pays one LUT per FF-driven CARRY4 S/DI bit (measured: 20.9% of all LUTs in a LiteX DDR SoC)

Status: Open.

#161 In openXC7/nextpnr-xilinx;

· cavearr opened on Aug 25, 2026

xc7a35t: router2 refuses a three-line flip-flop — 'Invalid global constant node .../VCC_WIRE' (builds on xc7a200t)

Status: Open.

#154 In openXC7/nextpnr-xilinx;

· gHashTag opened on Aug 18, 2026