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rajamesandJunie a8b70e88d3 Reorganize source tree: kernel/, v3/, v4/ split and board infrastructure

Source tree reorganization:
- Move StarForth v3 engine to v3/ (src/, include/, Makefile)
- Move kernel to kernel/ (src/, include/, linker/, Makefile)
- Create v4/ skeleton for F18-ISA golden model (DECOMPOSITION.md, JUSTIFICATION.md)
- Move FABRIC-0..4.md to docs/fabric/
- Move ONTOLOGY.md and ROADMAP.md to docs/

Board infrastructure:
- Add boards/ser5/, boards/raspi/, boards/milkv/, boards/zynq7020/
- Each board has board.mk (ISA, CPU flags, boot recipe) and README.md
- Root Makefile becomes thin dispatcher: boot_image, all, clean, docs take TARGET
- make boot_image TARGET=SER5|RASPI|MILKV builds one GPT/MBR image per board
- ZYNQ7020 target exists but stops with clear error (ARMv7 port not built yet)
- scripts/mkdiskimage.sh builds disk images for all boards

Docs pipeline:
- docs/book/ with LaTeX master (main.tex) and Makefile
- pandoc converts Markdown to LaTeX at build time
- Two Lua filters: table-widths.lua (wide tables wrap), code-breaks.lua (inline code breaks)
- make docs builds single PDF (754 pages, 0 missing characters)
- make docs TARGET=<board> adds board appendix
- build/docs/<book|board>/meta.tex stamps git commit into PDF

Bug fixes:
- 42 include paths that only worked by accident now use correct relative paths
- clang-18 hardcode replaced with configurable CC variable (fixed aarch64 build)
- Pi 5: kernel_2712.img linked at 0x80000, .bss zeroed, memory reserved
- Doxyfile, .clang-tidy, README.md, Kconfig paths updated

Verified:
- Hosted v3 build passes 1012 tests, 0 failures
- SER5 image boots in QEMU (OVMF), POST passes, K exact (65536 = Q48_ONE)
- Milk-V image boots in QEMU (OpenSBI + U-Boot + bootefi), POST passes
- make clean TARGET=<board> removes only that board and its ISA objects
- make all builds all boards, hosted v3, and docs in one run

Co-authored-by: Junie <junie@jetbrains.com>

2026-10-01 15:40:09 -04:00

board.mk

Reorganize source tree: kernel/, v3/, v4/ split and board infrastructure

2026-10-01 15:40:09 -04:00

config.txt

Reorganize source tree: kernel/, v3/, v4/ split and board infrastructure

2026-10-01 15:40:09 -04:00

README.md

Reorganize source tree: kernel/, v3/, v4/ split and board infrastructure

2026-10-01 15:40:09 -04:00

README.md

Raspberry Pi 5 native boot media

make boot_image TARGET=RASPI builds build/boards/raspi/lithos-raspi.img: an MBR disk with one FAT32 (LBA) partition. Write it to an SD card with dd. The partition holds:

config.txt: checked in here (FABRIC-3.md §IV.3 item 6). It pins kernel_address=0x80000 because Pi 5 firmware loads kernel_2712.img at 0x200000 by default.
kernel_2712.img: the aarch64 kernel objects relinked at 0x80000 by kernel/linker/starkernel-native-rpi5.ld, entered at rpi5_native_start (kernel/src/arch/aarch64/native_rpi5_entry.S, which zeroes .bss first), and flattened with objcopy -O binary.
bcm2712-rpi-5-b.dtb: the Raspberry Pi firmware's own stock DTB. It is not built by this project; it is fetched once from the firmware release pinned in board.mk (RPI_FIRMWARE_TAG) into build/cache/. To use a local copy, pass RPI5_DTB=/path/to/dtb.
cmdline.txt: only present when KERNEL_ARGS="..." is given. The firmware copies it into /chosen/bootargs, which rpi5_native_boot() parses.

Not yet verified on hardware. The native path still assumes everything kernel_main() needs after a UEFI handoff. The firmware enters at EL2 with the MMU off, which is not what UEFI hands over, and that difference has not been exercised.