Hi
We find a bug in xhci, USB DVD boot with emtpy disk will hang Xhci while Ehci can pass.
The hang log is shown as : MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c(1847): TrsRing != ((void *) 0)
We suggest a way to solve this bug is shown as: https://github.com/suling-123/edk2 the latest commit, MdeModulePkg: Solve boot hang xhci driver when use USB DVD with empty disk, 950bc8781d81b96b0c7944e7ac947382b1bc0c06
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[rebecca@openfw.io]