SchOS/.claude/memory/schunix-usb-ids.md
Nexoniarz 57aff40228 docs: four directories, and a rule for when a thing leaves the roadmap
docs/ was ten files where a plan, a description, a guide and a bug report all
sat next to each other. It is now architecture/ (what SchOS is), plan/ (what it
will be), guides/ (how to work on it) and history/ (why it is like this), with
an index that states the one rule holding it together: when something is
finished it moves from plan/ to architecture/ and is rewritten as a description
of the thing rather than a record of building it.

A ticked checkbox says the work happened. It does not say what the work
*produced*, and six months later the checkbox is all that is left. The network
stack proved the point: finished, verified end to end, and for a month the only
description of it anywhere was a checkbox four levels of indentation deep.

So roadmap.md went from 534 lines to 181 -- nothing deleted, the done work
graduated. Seven subsystems that were finished and undescribed now have
descriptions: boot, kernel, syscalls, filesystem, networking, graphics, usb,
init. Every one ends with "What it does not do", which is the section that pays;
a document listing only strengths is marketing, and the reader who needs it most
is the one about to trip over a limitation nobody wrote down.

schfs.md still opened with "phases 1 through 3 1/2 are done, phase 4 is next"
long after all five had landed. It is a description now, with the phase record
and the hard-won bugs moved to history/.

Three corrections found on the way, all load-bearing:

  * projects/schcom/README.md claimed SCM_RIGHTS was done. There is no
    sendmsg/recvmsg in the kernel at all, and an entire GUI plan rested on it.
  * The root README said "No TCP/IP" months after the stack landed.
  * history/kernel.md sec.7 was marked "in progress" on a problem that process
    groups solved.

Also adds plan/1.0.md, which draws a finish line so the open list stops being
infinite, and marks schwm/ and schde/ superseded: in Wayland the compositor is
the window manager, so that split dissolves rather than being abandoned.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VQ7Qx8E1q1M1bbCq8QLHS2
2026-09-12 17:13:35 +02:00

2.3 KiB

name description metadata
schunix-usb-ids usb.ids ships as /usr/share/usb.ids, cached in dist/ and refreshed with `make usb-ids` — deliberately not on every build.
node_type type originSessionId modified
memory project 9d8a2aef-bcf0-47a0-96c6-f706efab4a95 2026-08-08T22:10:41.961Z

Added 2026-08-09 at Nexoniarz's request. dist/usb.ids → sysroot/usr/share/usb.ids, 730 KB, 25,673 lines, version 2026.06.26.

Licence: dual GPL-2.0-or-later OR 3-clause BSD. The file's own header says nothing; the statement is on http://www.linux-usb.org/usb-ids.html: "under the terms of either the GNU General Public License (version 2 or later) or of the 3-clause BSD License." Schunix takes the BSD option — the GPL one could not be exercised, since Apache-2.0 and GPL-2.0-only cannot be combined. NOTICE carries the attribution and says which option was taken.

Two places I deliberately did not do what was asked

"Update every compilation." It is cached in dist/ and refreshed only by make usb-ids. Fetching per build would break offline builds, make the same source produce different images on different days, and put a third-party web server on the critical path of make — and dist/ exists precisely so a rebuild never needs the network (stated in docs/guides/layout.md). The file is committed and carries its own version and date, so what shipped is always knowable. The update target validates the download (grep -q "^# Version:") before replacing the cached copy, so a truncated file or an error page cannot silently destroy a good database.

It is not in the kernel. 730 KB against a ~770 KB kernel. Linux does not do this either — the kernel reports vendor:product and lsusb resolves names from /usr/share/hwdata/usb.ids in userspace. Same split here: /proc/devices and the USB core report IDs; a future lsusb reads the database.

Also added to RAMDISK_EXCLUDE — 730 KB is 12% of the 6 MB ramdisk root and nothing needs it to boot. Verified: mkfs: excluding usr/share/usb.ids, ramroot metadata unchanged at 345 blocks. This is the second real use of that mechanism (see schunix-ramdisk-root-sizing).

Still to do: nothing reads it yet. An lsusb in cmd/ that walks the USB core's device list and looks names up is the natural next step, and would make /proc/devices far more legible than 1234:1111.