pdp7

OpenSBI Mailing List Digest, 2026-Jan through 2026-May

Source: ~/opensbi-mail-archive/2026-{January,February,March,April,May}.txt. Approximately 526 messages across five months, with ~76 from Anup Patel (de-facto maintainer) leading review, and substantial new platform/feature work landing or in flight.

The digest is organized by topic. The first section is a deep dive on Tenstorrent contributors, since the reader is at Tenstorrent and asked for detail there. Subsequent sections cover the broader upstream picture so a NotebookLM "deep dive" episode has enough scaffolding to draw connections, debates, and architectural threads.

---

1. Tenstorrent contributors

pdp7

#!/usr/bin/env bash
# Refresh a semcode database: source code (current HEAD or branches),
# lore archives + new shards, then regenerate vector embeddings.
#
# Usage: update-semcode.sh [options]
#
# Options:
#   -s, --source <dir>     source tree to index (default: cwd)
#   -d, --database <dir>   db dir or its parent (default: same as --source)
#       --branches <list>  comma-separated branches to update (uses --update-branches)

pdp7

                                                                                                    
  Patch sizes vs resctrl norms                                                                                        
   
  ┌───────────────────────────────────────────────┬──────────────────────┬───────────────────┬──────────────────┐     
  │                    Series                     │       Patches        │      Median       │ Max lines/patch  │  
  │                                               │                      │    lines/patch    │                  │     
  ├───────────────────────────────────────────────┼──────────────────────┼───────────────────┼──────────────────┤  
  │ Recent fs/resctrl (last 30)                   │ small                │ ~30               │ ~50              │     
  │                                               │ fixes/refactors      │                   │                  │     
  ├───────────────────────────────────────────────┼──────────────────────┼──────────────────

pdp7

name	Drew Fustini - writing style and voice
description	How Drew writes on lkml/linux-riscv (cover letters, replies, sign-offs); use to match his tone in drafts of emails, commit messages, and cover letters
type	user
originSessionId	49cba08f-3549-46fe-86fe-0fe3c60829bb

Studied from a sample of Drew's lore.kernel.org emails. Index covers 447 emails from fustini April 2020 - July 2025; ~75-80% are replies, the rest cover letters / standalone patches / pull requests. Style is remarkably stable across the 5-year span and across employer changes (gmail -> beagleboard -> baylibre -> tenstorrent -> pdp7.com / fustini@kernel.org).

Tone and persona

pdp7

MPAM QoS features and MPAM support in Linux resctrl

A technical survey of Arm's Memory Partitioning and Monitoring (MPAM) extension and the multi-year effort to expose it through the Linux resctrl filesystem. Written against this tree (Linux v7.0-base, RISC-V CBQRI development branch); file paths and message-IDs cite primary sources where possible.

---

1. Executive summary

pdp7

ptybb		 ptyq5	ptyuf  ptyz9  tty63   ttye2  ttysc  ttyx6
debian@lpi4amain:~$ ls /dev/^C
debian@lpi4amain:~$ dmesg
[    0.000000] Booting Linux on hartid 3
[    0.000000] Linux version 7.0.0-rc3-next-20260313 (pdp7@thelio) (Ubuntu clang version 18.1.3 (1ubuntu1), Ubuntu LLD 18.1.3) #1554 SMP PREEMPT Sun Mar 15 11:40:21 PDT 2026
[    0.000000] random: crng init done
[    0.000000] Machine model: Sipeed Lichee Pi 4A
[    0.000000] SBI specification v2.0 detected
[    0.000000] SBI implementation ID=0x1 Version=0x10004
[    0.000000] SBI TIME extension detected

pdp7

/home/dfustini/.tenstorrent-venv/bin/python boot.py --boot --l2cpu 0 --opensbi_bin fw_jump.bin --opensbi_dst 0x400030000000 --rootfs_dst 0x4000e5000000 --kernel_bin Image --kernel_dst 0x400030200000 --dtb_bin blackhole-card.dtb --dtb_dst 0x400030100000
 Starting PCI link reset on BH devices at PCI indices: 0 
Waiting for up to 2 seconds for asic to come back after reset
 Config space reset completed for device 0 
 Finishing PCI link reset on BH devices at PCI indices: 0 
Writing OpenSBI to 0x400030000000
Writing Kernel to 0x400030200000
Writing dtb to 0x400030100000
Setting clock to  200
Setting clock to  1750

pdp7

#
# Automatically generated file; DO NOT EDIT.
# Linux/riscv 6.18.0-rc6 Kernel Configuration
#
CONFIG_CC_VERSION_TEXT="Ubuntu clang version 18.1.3 (1ubuntu1)"
CONFIG_GCC_VERSION=0
CONFIG_CC_IS_CLANG=y
CONFIG_CLANG_VERSION=180103
CONFIG_AS_IS_LLVM=y
CONFIG_AS_VERSION=180103

pdp7

#include <stdio.h>
#include <stdlib.h> 

int main(int argc, char *argv[]) {
    long int_value;
    char *endptr;  
    int x;
    
    if (argc < 2) {
        printf("Usage: %s <integer_argument>\n", argv[0]);

pdp7

vendor_id	: GenuineIntel
cpu family	: 6
model		: 106
model name	: Intel(R) Xeon(R) Gold 5315Y CPU @ 3.20GHz
stepping	: 6
microcode	: 0xd000410
cpu MHz		: 800.000
cache size	: 12288 KB
physical id	: 0
siblings	: 16