Hello EDKII community,

We build ELF UefiPayload for custom Alder Lake S board (we load UEFI by SBL). This payload boot s GRUB2 (and another efi programs, such as memtest) successfully. We tried load Win10, but we didn't get boot visibility. After the load attempt, the following messages were added to the log.

XhcClearBiosOwnership: called to clear BIOS ownership
SmmInstallProtocolInterface: 296EB418-C4C8-4E05-AB59-39E8AF56F00A 0
CpuDxe: 5-Level Paging = 0
Surprisingly, the Win7 starts boot ing in safe mode but stops at one of the drivers (This also happens on the factory bios. Most likely, Win7 does not support our hardware).
Ubuntu booting is also interrupted before first kernel printk. We build kernel for debugging, but kernel debugging starts too late. I attach logs of loading by EDKII (fail) and default loading by the factory bios (only kernel messages).
We don't understand how to deal with this situation. Can anyone help/suggest ?

P.S. While I was writing , I thought what if I put a break point on the XhcClearBiosOwnership function in EDK II and check it out.


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