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According to the UEFI spec, EFI_EVENT_GROUP_READY_TO_BOOT "is notified by the system when the Boot Manager is about to load and execute a boot option". ArmVirtPkg doesn't do this currently when launching a kernel from the QEMU command line. OvmfPkg does (see git commit 28a34033ee). At least two edk2-wide callbacks are worth mentioning: - OnReadyToBoot() in "MdeModulePkg/Universal/Variable/RuntimeDxe/VariableDxe.c" performs variable reclaim and (optionally) installs variable usage statistics as a vendor config table; - OnReadyToBoot() in "SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c" installs the image execution info table if it doesn't exist yet, in SecureBoot-enabled builds. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18513 6f19259b-4bc3-4df7-8a09-765794883524