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fix(usb): the xHCI controller is found by class on any bus, sized, taken from the firmware, and 64-byte contexts laid out

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boards/BRINGUP.md A1, FABRIC-3 SXL.  It was matched by QEMU's own IDs on
bus 0 alone, so no real board's was found.  Now pci_find_class() reads
every bus/slot/function; pci_bar_size() sizes BAR0; the USB Legacy Support
capability hands the controller over from the BIOS, SMIs off; CSZ=1
contexts are placed 64 bytes apart instead of refused.  XHCI_QEMU_ARGS
lets QEMU place the controller as real hardware does.

Test first: an NEC controller behind a PCIe root port -- no attach before,
Zuse minted after, on all three ISAs.  Standard acceptance unchanged; five
hot-plugged identities attach.  Not rehearsable: firmware handoff, CSZ=1.
Still open: only the first controller found is used.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-14 13:30:50 -04:00
co-authored by Claude Opus 5.5
parent 0e2c60dac3
commit 080b7012ba
24 changed files with 72536 additions and 67 deletions
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