BroadwellDEFspPkgBin USB initialization issues

[MrChromebox]

With Broadwell-DE MR2 FSP, USB port initialization has multiple issues:

• only user-facing controls are to enable/disable the two EHCI controllers; nothing for XHCI
• with SeaBIOS payload, attached USB devices only detected if FSP debug level set to 3 and MRC cache disabled (or first boot after flashing)
• with Linux payload, ehci/xhci host controllers (and child devices) only detected when modules compiled with =y (vs =m); attached devices detected but non-functional

edit: USB ports/attached devices are fully functional once Linux kernel has booted regardless of state in bootloader

[Ankita2107]

What tool are you using for enabling/disabling interfaces like EHCI controllers?

[MrChromebox]

using the coreboot Kconfig options, which set the UPDs passed to FSP silicon init. En/disable EHCI1, ECHI2 are only available options/UPDs, and function as expected (ie, PCI device disabled/hidden)