Add Orange Pi RV2 gemv_n / HPL NaN video to the site.

Wire YouTube W_-8cKA-CCU into videos.yml and cross-link from home, RV2, HPL, and BLAS.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: hugomeiland

README.md

@@ -10,6 +10,7 @@ OpenSolvers explores how open-source scientific software runs on real hardware 
 
 Walkthroughs on our [YouTube channel](https://www.youtube.com/@opensolvers) — see the full list on the [Videos](videos.html) page.
 
+- **[NaN Linpack on RISC-V (Orange Pi RV2)](https://www.youtube.com/watch?v=W_-8cKA-CCU)** — stock RVV OpenBLAS fails HPL with residual `nan`; gemv_n fix via EESSI + FlexiBLAS (10.53 GFLOP/s PASSED)
 - **[1.69× HPL on VisionFive 2](https://www.youtube.com/watch?v=DS4IlzsEq9w)** — U74-tuned OpenBLAS via EESSI and FlexiBLAS (3.13 → 5.28 GFLOP/s)
 
 ## What we're working on

_data/videos.yml

@@ -1,4 +1,28 @@
 # YouTube videos — add new entries here (newest first).
+- id: x60-gemv-hpl-rv2
+  title: "NaN Linpack on RISC-V: Fixing OpenBLAS gemv_n on Orange Pi RV2 (EESSI)"
+  description: >
+    Stock EESSI OpenBLAS on an Orange Pi RV2 reports ~8.5 GFLOP/s on HPL — then
+    residual nan, FAILED. We isolate 192 NaNs in RVV dgemv with difftest, and fix
+    it via OpenBLAS#5408 / easyconfigs#26444 through FlexiBLAS (10.53 GFLOP/s PASSED).
+  youtube_id: W_-8cKA-CCU
+  date: 2026-07-19
+  duration: PT6M23S
+  boards:
+    - Orange Pi RV2
+  topics:
+    - HPL
+    - OpenBLAS
+    - EESSI
+    - FlexiBLAS
+    - RVV
+  related_pages:
+    - title: Orange Pi RV2 board notes
+      url: /boards/RV2.html
+    - title: HPL overview
+      url: /apps/hpl.html
+    - title: BLAS / OpenBLAS
+      url: /scientific-libs/blas.html
 - id: u74-hpl-visionfive2
   title: "1.69× HPL on RISC-V: U74-Tuned OpenBLAS on VisionFive 2 (EESSI)"
   description: >

apps/hpl.md

@@ -23,6 +23,8 @@ Cross-board summary of **High Performance Linpack (HPL)** on consumer RISC-V har
 
 ## Orange Pi RV2 — detailed results
 
+**Video:** [NaN Linpack on RISC-V: Fixing OpenBLAS gemv_n on Orange Pi RV2 (EESSI)](https://www.youtube.com/watch?v=W_-8cKA-CCU) — [all videos](../videos.html)
+
 Stock EESSI dispatches RVV `ZVL256B` on the X60, but the unpatched `gemv_n` kernel makes HPL report ~8.5 GFLOP/s while **failing** the residual check (`nan`). With the [easyconfigs#26444](https://github.com/easybuilders/easybuild-easyconfigs/pull/26444) fix, all runs below **PASSED**.
 
 ### EESSI walkthrough (fixed backend)

boards/RV2.md

@@ -2,6 +2,10 @@ The Orange Pi RV2 is built on the SpaceMiT **K1** SoC: eight **SpacemiT X60** co
 
 ![](rv2.png)
 
+## Video walkthrough
+
+**[NaN Linpack on RISC-V: Fixing OpenBLAS gemv_n on Orange Pi RV2 (EESSI)](https://www.youtube.com/watch?v=W_-8cKA-CCU)** — [all videos](../videos.html)
+
 ## Compute paths on this board
 
 The K1 SoC exposes all four paths we benchmark: scalar baseline, **RVV** OpenBLAS, **IME** int4 matrix ops (cluster 0), and an integrated **GPU**.

scientific-libs/blas.md

@@ -19,7 +19,7 @@ Verification microbenchmarks live in [opensolvers/benchmarks/OpenBLAS](https://g
 | Target | EasyBuild PR | Upstream OpenBLAS | Walkthrough |
 | ------ | ------------ | ----------------- | ----------- |
 | SiFive U74 | [easyconfigs#26436](https://github.com/easybuilders/easybuild-easyconfigs/pull/26436) | [OpenBLAS#5903](https://github.com/OpenMathLib/OpenBLAS/pull/5903) | [EESSI/docs#818](https://github.com/EESSI/docs/pull/818) |
-| SpacemiT X60 | [easyconfigs#26444](https://github.com/easybuilders/easybuild-easyconfigs/pull/26444) | [OpenBLAS#5408](https://github.com/OpenMathLib/OpenBLAS/pull/5408), [#5476](https://github.com/OpenMathLib/OpenBLAS/pull/5476) | [EESSI/docs#819](https://github.com/EESSI/docs/pull/819) |
+| SpacemiT X60 | [easyconfigs#26444](https://github.com/easybuilders/easybuild-easyconfigs/pull/26444) | [OpenBLAS#5408](https://github.com/OpenMathLib/OpenBLAS/pull/5408), [#5476](https://github.com/OpenMathLib/OpenBLAS/pull/5476) | [EESSI/docs#819](https://github.com/EESSI/docs/pull/819) · [YouTube](https://www.youtube.com/watch?v=W_-8cKA-CCU) |
 
 Build with `eb --from-pr <num> --robot` into an **EESSI-extend** user install, then `flexiblas add` / `flexiblas default` — no downstream rebuild.
 

website.md

@@ -60,6 +60,7 @@ Catalog: `_data/videos.yml` (newest first). Rendered by `_includes/video-grid.ht
 
 | Date | Decision |
 |------|----------|
+| 2026-07-19 | Publish X60 gemv_n / HPL NaN video (`W_-8cKA-CCU`) — `_data/videos.yml`, homepage, RV2, HPL, BLAS |
 | 2026-07-19 | Sync benchmarks PR #19–20: add **BLIS** page; expand **GROMACS** with RVV Force backend (3.31×) and 2026.3 autovec lever |
 | 2026-07-19 | Nav: OpenSolvers title links home; Home/Videos/YouTube on separate row from Apps |
 | 2026-07-19 | Sync benchmarks PR #18: merge OpenBLAS verification into BLAS page; remove `dgemm.html`; fix GitHub links |