feat(kernel): screen=boot keeps the console on the screen until login -- for watching a PC boot

KernelArgs gains screen_boot; cmdline.c parses screen=boot (with or without --; any other value:
off). With it, the v4 boot keeps the console mirrored to the framebuffer after POST, with the TTF
font, and says 'Screen: the console stays on until login (screen=boot)'; login and logout work as
without it, and nothing can be typed without Zuse. Without it, unchanged. For the SER5, which has
no known serial port (ruled 2026-10-28). BRINGUP.md: the smoke test's stick and starforth.cfg.

Tests: screen_boot (new) failed on amd64 and aarch64 before, passes on all three ISAs after;
screen_dark_until_login, screen_dark_after_logout, zuse pass. Acceptance: amd64, aarch64, riscv64 to
[zuse@Hera] ok>, POST 538/538, dict_hash 0xfec8c47cfc6f437f; v4 suite and test-32 0 failures.

Plan: docs/v4.0.0/plans/2026-10-27-stick-4-one-disk.md, Task 5.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-28 17:50:10 -04:00
co-authored by Claude Opus 5.5
parent 1e8a6fed34
commit 954b4d5f70
27 changed files with 1784 additions and 4 deletions
+4 -2
View File
@@ -201,8 +201,10 @@ the one QEMU exercises most closely, and the Pi 5's can be rehearsed only in par
no virtio-rng).
- [ ] **The smoke test's stick** (2026-10-28, after the stick's increment 4): `make boot_image
TARGET=PC STICK_PAIR=disk/zuse-scratch`, Zuse's minted pair in the stick's partitions;
`system=v4 screen=boot` in its `starforth.cfg` once `screen=boot` exists (increment 4,
Task 5). Watch for `Boot disk: a StarshipOS stick`, `Artemis: the stick's partition
`system=v4 screen=boot` in its `starforth.cfg` (build with `KERNEL_ARGS=screen=boot`, or
edit the file on the stick's ESP): the console stays on the HDMI screen from POST until
Zuse logs in, so a failure after POST is not a black screen ("Screen: the console stays
on until login (screen=boot)"). Secure Boot off. Watch for `Boot disk: a StarshipOS stick`, `Artemis: the stick's partition
attached`, then `[zuse@Hera] ok>`. The same image boots in QEMU first:
`make -f kernel/Makefile ARCH=amd64 qemu-stick STICK_PAIR=disk/zuse-scratch`.
- [ ] The timer lines differ from QEMU's by design: no hypervisor, so the HPET path runs for