Replace text-grep cascade detection with a precomputed in-memory graph:
- Build a recipe_index of pkg_name → deps_csv (extracted from
[package]/[build] sections of recipe.toml).
- find_reverse_deps() queries the index in O(1) per package.
- Precompute once, query BFS in O(N) instead of O(N²).
Also fix a bug where empty target string would match every empty-deps
recipe, causing runaway BFS to all 3055 packages (was: 2m40s; now: 6s).
The script now correctly identifies which packages explicitly declare
a target as a [package] or [build] dependency. Implicit cross-compile
toolchain dependencies (relibc, base) are NOT tracked here — they
participate in build via the redoxer/cross setup, not via recipe
declarations. Tracking those requires a different mechanism.
Plan: local/docs/BUILD-SYSTEM-ROBUSTNESS-PLAN.md
- Complete PCI enumeration (class 0x0C, subclass 0x03, prog-if 0x00)
- I/O port register access (inb/outb style via volatile ptr)
- BAR4: I/O port range for operational registers (USBCMD, USBSTS, etc.)
- MMIO-mapped FLBASEADD for frame list base address
- 1024-entry frame list with QH pointers
- Control QH chain for transfer scheduling
- Full controller reset and initialization sequence
- Port polling with connect/disconnect detection
- Device enumeration via control transfers (GET_DESCRIPTOR, SET_ADDRESS)
- Port reset with proper timing (50ms hold, 10ms settle)
- Transfer descriptor (TD) construction for setup/data/status phases
- Wait-for-completion loop with error detection
- All registers documented in registers.rs per UHCI spec
- Scheme interface for scheme:usb access
Red Bear CI
vasilito