Thanks Ruiyu, for confirming.
> On 27-Nov-2018, at 7:15 AM, Ni, Ruiyu <ruiyu...@intel.com> wrote: > >> On 11/23/2018 5:19 PM, Laszlo Ersek wrote: >>> On 11/23/18 07:27, prabin ca wrote: >>> Hi Team, >>> >>> I’m new to UEFI and display interface in UEFI. I would like to have deep >>> dive into how display is working in UEFI (display architecture) and how >>> display is have been bring up (porting of display panel in a any platform >>> in general ). >>> >>> Please help me with sample codes and necessary documents. I would like to >>> get knowledge about display bring up and display architecture in UEFI >> The driver writers' guide and the UEFI spec have relevant chapters on >> this. I think it's best to start reading the former, at "23 Graphics >> Driver Design Guidelines"; that part will give you the pointers to the >> rest as well. >> https://github.com/tianocore/tianocore.github.io/wiki/UEFI-Driver-Writer%27s-Guide >> For a (hopefully educational) example, I refer you to >> OvmfPkg/VirtioGpuDxe. In the series that first added this driver to >> edk2, I managed to construct the driver in stages such that each stage >> would build and even function, at the level expected from that stage. In >> particular, commit a2a4fa66701d ("OvmfPkg/VirtioGpuDxe: introduce with >> Component Name 2 and Driver Binding", 2016-09-01) could prove helpful, >> as it adds the skeleton of the driver, mostly without VirtIo GPU specifics. >> In addition, you might want to look into the generic >> MdeModulePkg/Universal/Console/GraphicsOutputDxe >> driver. A platform may be able to incorporate that driver without any >> changes, and control it by first producing the two HOBs in the PEI phase >> that the driver consumes: >> MdePkg/Include/Guid/GraphicsInfoHob.h >> (... Interestingly, due to the fact that this header file is under >> MdePkg and not MdeModulePkg, I've just learned, from the related commit >> messages, that the PEI phase has standardized graphics support, >> described in the PI spec. From the following two commit messages: >> - 697c6cf32693 ("MdePkg: Add PI 1.4 Graphics HOB and PPI header files", >> 2015-04-28) >> - 2af538fbf667 ("MdeModulePkg: Add GraphicsOutputDxe driver.", 2016-10-12) >> it appears that enabling graphics support in the PEI phase could be a >> *requirement* for using GraphicsOutputDxe in the DXE phase. That might >> or might not match your use case, so perhaps it will prevent you from >> using GraphicsOutputDxe. I'm not sure.) > > Yes. GraphicsOutputDxe layers on the HOB produced in PEI phase to provide GOP > protocol. > > >> Thanks >> Laszlo >> _______________________________________________ >> edk2-devel mailing list >> edk2-devel@lists.01.org >> https://lists.01.org/mailman/listinfo/edk2-devel > > > -- > Thanks, > Ray _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
