blog: 179 features that change no bits - #877
Open
gHashTag wants to merge 1 commit into
Open
Conversation
A parity report between the himbaechel xilinx port and nextpnr-xilinx 0.9.3 ranked its own work items backwards: the 179 missing BRAM features are zero-codepoints, and the blocker that kept a bitstream off a board produced no feature-count delta at all. Adds the post with receipts for #165, its two corrections, openXC7/nextpnr#1, prjxray-db#7, and the two open BUFIO items. Every measurement is attributed upstream; none was reproduced here, and that is stated in openQuestions. Co-Authored-By: Claude <noreply@anthropic.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Adds one blog post:
features-that-change-no-bits, dated 2026-08-31.What it reports
Material from the last 24 hours in
openXC7/nextpnr-xilinx#165, plus the mergedchanges it depends on:
as "the most concrete bitstream-parity item and the one I would fix first".
proven three independent ways (segbits, a
bit2fasmround trip givingbyte-identical 5 576 340 B frames in both arms, and a Vivado ML 2026.1 golden).
produced no feature-count delta and failed in two different-looking ways
depending on the prjxray-db revision.
being the one carrying
openXC7/nextpnr#1.Honesty notes
cavearr's in fix(state): add missing child.deinit() in tri_state.zig runProcessInherit #165; the board run is jrrk2's on his own Sonata. This is stated
in the body and again as the first
openQuestionsentry.fix(state): add missing child.deinit() in tri_state.zig runProcessInherit #165 OPEN, refactor(faculty): extract hardcoded paths to constants in faculty_board.zig #168 OPEN, feat(cloud): add API key validation before spawning agent container #149 OPEN,
openXC7/nextpnr#1MERGED 2026-08-29,openXC7/prjxray-db#7MERGED 2026-08-26.quoteblocks rather thanparaphrased into something stronger — including "to our knowledge" on the
first-board-verified claim.
comparable between trees, the BRAM address cascade unverified on silicon, and
the regional clock path routed around rather than fixed.
ruis complete: title, summary, openQuestions and body.Build
npm run build:ciexits 0; the slug appears indist/assets/Blog-D9NOt413.jsand gets its own chunk
features-that-change-no-bits-DCKQ1Tl1.js.Not merging — publication is the operator's decision.
🤖 Generated with Claude Code