Hi:
When adding a new mode into GOP modes, BiosVideo uses SearchEdidTiming
make a check with EDID and each resolution. ParseEdidData only fills EDID data
for SearchEdidTiming’s use.
if (EdidFound && (ValidEdidTiming.ValidNumber > 0)) {
//
// EDID exist, check whether this mode match with any mode in EDID
//
Timing.HorizontalResolution =
BiosVideoPrivate->VbeModeInformationBlock->XResolution;
Timing.VerticalResolution =
BiosVideoPrivate->VbeModeInformationBlock->YResolution;
if (!SearchEdidTiming (&ValidEdidTiming, &Timing)) {
continue;
}
}
Elvin
From: Hawk [mailto:[email protected]]
Sent: Tuesday, November 27, 2012 10:50 AM
To: [email protected]
Subject: [edk2] 答复: Question about BIOS Video Driver
Hi Elvin,
We want to set the highest resolution supported by both of video controller and
monitor during POST. Also I agree with you about the proposed solution as below
to have BiosVideo driver achieve this.
But the key point is the current implementation of BIOS video can only
determine if the following resolution can be supported or not in VBE 3.0
interface. Check ParseEdidData() for detailes.
n 640 * 480
n 720 * 400
n 800 * 600
n 832 * 624
n 1024 *768
n 1280 * 1024
Is there other interface to convey information of higher resolution, if they
are supported by both of video controller and monitor?
Thanks,
Hawk.
发件人: Li, Elvin [mailto:[email protected]]<mailto:[mailto:[email protected]]>
发送时间: 2012年11月27日 10:30
收件人: [email protected]<mailto:[email protected]>
主题: Re: [edk2] Question about BIOS Video Driver
Hi:
You would use GraphicsOutputProtocol->QueryMode to get all the
resolutions at first, these resolutions returned has been supported by both
monitor and video controller, then you can do like GraphicsConsole.c does to
find the highest resolution:
MaxMode = Private->GraphicsOutput->Mode->MaxMode;
for (ModeIndex = 0; ModeIndex < MaxMode; ModeIndex++) {
Status = Private->GraphicsOutput->QueryMode (
Private->GraphicsOutput,
ModeIndex,
&SizeOfInfo,
&Info
);
if (!EFI_ERROR (Status)) {
if ((Info->HorizontalResolution >= HorizontalResolution) &&
(Info->VerticalResolution >= VerticalResolution)) {
HorizontalResolution = Info->HorizontalResolution;
VerticalResolution = Info->VerticalResolution;
ModeNumber = ModeIndex;
}
FreePool (Info);
}
}
What is your purpose? If you want to let BiosVideo driver to set video
mode to highest resolution directly, you could set PcdVideoHorizontalResolution
and PcdVideoVerticalResolution to 0x0 to make BiosVideo to set highest
resolution.
Thanks
Elvin
From: Hawk [mailto:[email protected]]
Sent: Tuesday, November 27, 2012 9:54 AM
To: [email protected]<mailto:[email protected]>
Subject: [edk2] Question about BIOS Video Driver
Hi Experts,
In ParseEdidData() in
IntelFrameworkModulePkg\Csm\BiosThunk\VideoDxe\BiosVideo.c, the EDID
information pointed by EdidBuffer is in the format of VBE 3.0 and retrieved by
int 10 4F15. According to the definition of following timing fields, 1280*1024
should be the highest resolution to be supported in this way.
EstablishedTimings[0]:
Bitfields for DPMS established timings 1:
Bit(s) Description
0 720x400 @ 70 Hz (VGA 640x400, IBM)
1 720x400 @ 88 Hz (XGA2)
2 640x480 @ 60 Hz (VGA)
3 640x480 @ 67 Hz (Mac II, Apple)
4 640x480 @ 72 Hz (VESA)
5 640x480 @ 75 Hz (VESA)
6 800x600 @ 56 Hz (VESA)
7 800x600 @ 60 Hz (VESA)
EstablishedTimings[1]:
Bitfields for DPMS established timings 2:
Bit(s) Description
0 800x600 @ 72 Hz (VESA)
1 800x600 @ 75 Hz (VESA)
2 832x624 @ 75 Hz (Mac II)
3 1024x768 @ 87 Hz interlaced (8514A)
4 1024x768 @ 60 Hz (VESA)
5 1024x768 @ 70 Hz (VESA)
6 1024x768 @ 75 Hz (VESA)
7 1280x1024 @ 75 Hz (VESA)
Our question is if there is one way to retrieve the information about higher
resolution, if it’s supported by video output device?
Thanks,
Hawk.
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