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feat(boards): both systems on every board image, chosen at boot -- system=v3 or system=v4

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boards/BRINGUP.md A6, FABRIC-3 SXLIII (ruled: one image, switch at boot).
A STARFORTH_V4 kernel carries v3 too; system= in the boot arguments
chooses, else the build's default (V4_DEFAULT: 1 for plain STARFORTH_V4
builds as before, 0 for board images).  make boot_image builds both and
always writes starforth.cfg / cmdline.txt with system=v3 first, and cleans
its ISA's objects first -- that clean was removing build/<arch>/SER5, not
the kernel's objects, until fixed here.

Each ISA: v3 by default (hash unchanged), v4 with system=v4 (538/538).
The SER5 image under OVMF: v3 as built, v4 after a one-word edit on it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-14 15:11:47 -04:00
co-authored by Claude Opus 5.5
parent e729c64ba3
commit 1a4b163861
32 changed files with 74479 additions and 17 deletions
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kernel/src/kernel_main.c
+24 -5
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@@ -561,12 +561,31 @@ static void kernel_main_deep(BootInfo *boot_info) {
console_println("Kernel initialization complete.");
console_println("Boot successful!\n");
/* Which system runs (boards/BRINGUP.md A6, ruled 2026-10-14: one image,
* both systems, chosen at boot). A kernel built with STARFORTH_V4
* carries v4 as well as v3; `system=v3` or `system=v4` among the boot
* arguments (starforth.cfg on the ESP, cmdline.txt on the Pi 5) picks,
* else the build's default (SK_V4_DEFAULT: on for a plain STARFORTH_V4
* build, off for a board image). */
#ifdef STARFORTH_V4
/* StarForth v4 at a single prompt (Kconfig STARFORTH_V4): one host node
* of the F18-derived engine, in place of the v3 VM and everything below.
* It does not return. */
sk_v4_boot_info = boot_info;
sk_v4_run(sk_v4_block_chain);
if (boot_info->args.system == KARGS_SYSTEM_V4 ||
(boot_info->args.system == KARGS_SYSTEM_DEFAULT && SK_V4_DEFAULT)) {
console_println(boot_info->args.system == KARGS_SYSTEM_V4
? "System: StarForth v4 (system=v4)"
: "System: StarForth v4 (this build's default)");
/* StarForth v4 at a single prompt: one host node of the F18-derived
* engine, in place of the v3 VM and everything below. It does not
* return. */
sk_v4_boot_info = boot_info;
sk_v4_run(sk_v4_block_chain);
}
console_println(boot_info->args.system == KARGS_SYSTEM_V3
? "System: StarForth v3 (system=v3)"
: "System: StarForth v3 (this build's default; system=v4 for v4)");
#else
console_println(boot_info->args.system == KARGS_SYSTEM_V4
? "System: StarForth v3 -- system=v4 asked for, and this kernel has no v4"
: "System: StarForth v3");
#endif
#ifdef STARFORTH_ENABLE_VM