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- test-usb boots an EHCI and an xHCI controller with a mouse + keyboard and
asserts enumeration, report decoding, and input reaching the shell. The
EHCI case asserts one key end-to-end (QEMU's EHCI model delivers only the
first report through root-port split transactions); the xHCI case asserts a
whole typed command.
- lib.sh: qemu_args() already supplies -bios, so the fresh OVMF varstore copy
was silently overridden by the system firmware. Pass the copy last (QEMU
honours the last -bios) so tests really boot clean NVRAM.
- DEBUG_NOTES: document why USB never worked on the OptiPlex (EHCI shipped
with DEBUG_MATRIX enabled, no RMH/hub support, only the first controller,
no boot protocol, unbounded DMA), the success/failure log to look for on
hardware, and the QEMU coverage limits.
- Makefile: add test-usb and include it in `make test`.
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