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

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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
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kernel/src/kernel_main.c
+11 -1
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@@ -544,8 +544,18 @@ static void sk_v4_block_chain(void)
* Zuse logs in (docs/v4.0.0/STICK.md 2 and 5.3; sk_v4_identity.c turns
* it on). The virtio keyboard is the riscv64/aarch64 machines'; a
* no-op where there is none. */
console_fb_mirror(0);
sk_console_fb_from_boot(sk_v4_boot_info);
if (sk_v4_boot_info->args.screen_boot) {
/* screen=boot: the screen shows what serial shows until the first
* login, for a PC with no serial port; login and logout then work
* as without it (plan 2026-10-27-stick-4-one-disk.md, Task 5).
* Nothing can be typed without Zuse either way. */
console_fb_mirror(1);
console_fb_enable_ttf();
console_println("Screen: the console stays on until login (screen=boot)");
} else {
console_fb_mirror(0);
}
(void)virtio_input_find_keyboard();
}
#endif