We are trying to boot RTOS on TGL platform with SBL+UEFI payload.
We discussed with our OS vendor, and we started booting OS with default payload and we were able to boot OS, but when we tried switching to UEFI payload, OS didn't boot
and it got stuck at below prints.

XhcClearBiosOwnership: called to clear BIOS ownership
FPDT: -ResetEnd                = 339000000
FPDT: -OsLoaderLoadImageStart  = 15095000000
FPDT: -OsLoaderStartImageStart = 15126000000
FPDT: -ExitBootServicesEntry   = 24262000000
FSP NotifyPhase EndOfFirmware Success.
gAddPerfRecordProtocolGuid - Locate protocol failed
SmmInstallProtocolInterface: 296EB418-C4C8-4E05-AB59-39E8AF56F00A 0
CpuDxe: 5-Level Paging = 0
MpInitChangeApLoopCallback() done!
SetUefiImageMemoryAttributes - 0x00000000759CC000 - 0x000000000000A000 (0x0000000000000008)
SetUefiImageMemoryAttributes - 0x00000000759C2000 - 0x000000000000A000 (0x0000000000000008)
SetUefiImageMemoryAttributes - 0x00000000759B8000 - 0x000000000000A000 (0x0000000000000008)
SetUefiImageMemoryAttributes - 0x00000000759AE000 - 0x000000000000A000 (0x0000000000000008)
SetUefiImageMemoryAttributes - 0x00000000759A5000 - 0x0000000000009000 (0x0000000000000008)
SetUefiImageMemoryAttributes - 0x0000000075999000 - 0x000000000000C000 (0x0000000000000008)
SetUefiImageMemoryAttributes - 0x000000007598C000 - 0x000000000000D000 (0x0000000000000008)
SetUefiImageMemoryAttributes - 0x0000000075983000 - 0x0000000000009000 (0x0000000000000008)
SetUefiImageMemoryAttributes - 0x000000007597A000 - 0x0000000000009000 (0x0000000000000008)
SetUefiImageMemoryAttributes - 0x0000000075970000 - 0x000000000000A000 (0x0000000000000008)

We just want some clarifications regarding exit boot services, whether EFI boot services succeeded or failed and where to add debug prints to identify the issue?


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