Robert Allan JamesandClaude Sonnet 5
ecdb32e0d6
Researched against the official raspberrypi.com config.txt reference and one real, working Pi 5 bare-metal project's own checked-in config.txt (leopoldch/BatMetal), not assumed from general Pi knowledge: - kernel=kernel_2712.img, os_check=0, device_tree=bcm2712-rpi-5-b.dtb - enable_uart=1 added (correction to the item's original text): costs nothing when unused, and is the only diagnostic channel that would survive a framebuffer failure on the untested mailbox path (rpi5_native_boot.c). - arm_64bit=1 dropped (correction to the item's original text): confirmed inert on Pi 5 by official docs. - dtparam=pciex1 researched, deliberately omitted with rationale recorded -- community-reported only, not needed until item 5's re-scoped RP1/PCIe work. - os_check=0 vs. BatMetal's own config (which omits it) recorded as an open, unresolved discrepancy rather than silently picked. boot_media/rpi5/README.md notes the one remaining gap this exposes: kernel_2712.img names a file nothing currently builds (item 1's separate-image build target is still outstanding future work). Doc-and-config only, no compiled code changed. Three-arch QEMU acceptance (amd64/aarch64/riscv64, in order) run to confirm non-regression only. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019YcT3H2PQeyujrzjqS3Var
13 lines
737 B
Markdown
13 lines
737 B
Markdown
# Raspberry Pi 5 native boot media
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What goes on the SD card for the native (non-UEFI) boot path (FABRIC-3.md §IV):
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- `config.txt` — checked in here, done (§IV.3 item 6).
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- `bcm2712-rpi-5-b.dtb` — Raspberry Pi firmware's own stock DTB; not built by this
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project, copied from the firmware release the card is otherwise built from.
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- `kernel_2712.img` — **does not exist yet.** `config.txt` names it, but no build target
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in `Makefile.starkernel` currently emits a raw image by this name at load address
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0x80000 — item 1 (entry stub) explicitly scoped a separate-image build target as future
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work, not part of that item. Building this file is the remaining prerequisite before
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item 7 (assembling the card) is possible.
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