mirror of https://github.com/acidanthera/audk.git
5126ef789d
The PlatformBdsEnterFrontPage() function's first parameter, "TimeoutDefault", determines the behavior of the setup utility: - If (TimeoutDefault == 0), then the usual boot order is to be acted upon immediately. - If (TimeoutDefault == 0xFFFF), then the setup utility is entered unconditionally. - If (0 < TimeoutDefault && TimeoutDefault < 0xFFFF), then the PlatformBdsEnterFrontPage() function displays a progress bar, waiting for TimeoutDefault seconds. If the user presses a key, then the setup utility is entered, otherwise the normal boot option processing takes place. The TimeoutDefault parameter is supposed to be set from gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdPlatformBootTimeOut which has the following (matching) documentation in "IntelFrameworkModulePkg/IntelFrameworkModulePkg.dec": The number of seconds that the firmware will wait before initiating the original default boot selection. A value of 0 indicates that the default boot selection is to be initiated immediately on boot. The value of 0xFFFF then firmware will wait for user input before booting. OVMF does this actually -- see the Timeout variable in PlatformBdsPolicyBehavior() -- but right before calling PlatformBdsEnterFrontPage(), OVMF hardwires TimeoutDefault to 0xFFFF. This has been acceptable until now, because OVMF implements its own "wait for keypress at the splash screen" logic in PlatformBdsPolicyBehavior(), completely avoiding the progress bar mentioned above. OVMF only calls PlatformBdsEnterFrontPage() when the user presses a key during its own "splash screen wait", and *then* it indeed makes sense to enter the setup utility unconditionally. However, even that way, the Timeout = 0xffff; assignment is superfluous, because 0xFFFF is already the default value of PcdPlatformBootTimeOut in "IntelFrameworkModulePkg.dec", and OvmfPkg doesn't override it in its DSC files. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16307 6f19259b-4bc3-4df7-8a09-765794883524 |
||
|---|---|---|
| AppPkg | ||
| ArmPkg | ||
| ArmPlatformPkg | ||
| BaseTools | ||
| BeagleBoardPkg | ||
| Conf | ||
| CryptoPkg | ||
| DuetPkg | ||
| EdkCompatibilityPkg | ||
| EdkShellBinPkg | ||
| EdkShellPkg | ||
| EmbeddedPkg | ||
| EmulatorPkg | ||
| FatBinPkg | ||
| IntelFrameworkModulePkg | ||
| IntelFrameworkPkg | ||
| IntelFspPkg | ||
| IntelFspWrapperPkg | ||
| MdeModulePkg | ||
| MdePkg | ||
| NetworkPkg | ||
| Nt32Pkg | ||
| Omap35xxPkg | ||
| OptionRomPkg | ||
| OvmfPkg | ||
| PcAtChipsetPkg | ||
| PerformancePkg | ||
| SecurityPkg | ||
| ShellBinPkg | ||
| ShellPkg | ||
| SourceLevelDebugPkg | ||
| StdLib | ||
| StdLibPrivateInternalFiles | ||
| UefiCpuPkg | ||
| UnixPkg | ||
| .gitignore | ||
| BuildNotes2.txt | ||
| Edk2Setup.bat | ||
| Maintainers.txt | ||
| edksetup.bat | ||
| edksetup.sh | ||