Robert Allan JamesandClaude Sonnet 5
65effbd1ba
Roots out the CSW status FAILED left unexplained in the prior increment: a freshly attached SCSI target's standing UNIT ATTENTION condition, which a bare READ(10) with no retry can never clear. xhci_bot_send_test_unit_ready() sends SCSI TEST UNIT READY (SPC-4 6.33) ahead of the real command; the CSW handler now tags command kind (bot_cmd_kind) to distinguish a TUR completion from a READ10 completion, chains TUR PASS into the real READ(10), and bounded-retries TUR on FAILED/PHASE ERROR (bot_tur_retries, capped at XHCI_BOT_TUR_MAX_RETRIES). xhci_bot_read_block() is the new intended entry point tying lba/num_blocks/block_size + the TUR-first sequencing together. Verified live via a temporary probe (hot-attached disk/usb-thumbdrive-test.img through the running instance's QMP socket), captured on amd64: full chain CBW(TUR) -> FAILED -> retry -> PASS -> CBW(READ10) -> Data-In -> CSW PASS. Probe reverted after capture; all three architectures re-verified clean, probe-free boot to ok>. FABRIC-2.md Section X 2g updated with the writeup. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CXjAPTEKrgY2Mrk25KoLDn
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