Implement sendFrameForStart handshake for hi3516av200#48
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HiTool uses sendFrameForStart (continuous 0xAA + HEAD frame blast) as the handshake instead of waiting for 0x20 markers. This puts the bootrom in the correct state for DDR initialization on av200. - Add _send_frame_for_start(): blasts 0xAA + HEAD(64, ADDRESS0) for 30s until bootrom ACKs - Use frame-blast for both initial handshake and post-SPL rehandshake on chips with PRESTEP0 - Add 300ms DDR training delay after SPL (HiTool's getDDRTrainingOver) - Skip separate handshake() for frame-blast chips in session - Increase HEAD frame timeout to 150ms (av200 needs ~100ms after ACK) Tested on hardware: - hi3516av200: full PRESTEP0→DDRSTEP0→PRESTEP1→SPL→U-Boot transfer OK - hi3516ev300: no regression, OpenIPC prompt reached - hi3516av300: no regression (PRESTEP0 without frame-blast) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
HiTool uses
sendFrameForStart(continuous 0xAA + HEAD frame blast for 30s) as the handshake instead of waiting for 0x20 markers. This puts the av200 bootrom in the correct state for DDR initialization.Without this, the protocol transfer completes (all frames ACKed) but U-Boot crashes because the bootrom was in the wrong internal state for DDR init.
Changes
_send_frame_for_start(): blasts0xAA + HEAD(64, ADDRESS0)every 50ms for 30s until ACKgetDDRTrainingOverlogic)handshake()for frame-blast chipsTest plan
uv run pytest tests/ -x -v --ignore=tests/fuzz— 326 passed🤖 Generated with Claude Code