Questions about uefi bios's vga mode

Questions about uefi bios's vga mode

[Tiger Liu]

Hi, experts:
I have a question about uefi bios’s vga mode.
Could we use VGA’s text mode to boot into uefi shell environment?

It seems vga class driver/mini port driver could support VGA’s text mode.

It seems gop driver support graphic mode.

Thanks


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Re: Questions about uefi bios's vga mode

[Andrew Fish]

> On Aug 31, 2017, at 2:08 AM, Tiger Liu <TigerLiu@zhaoxin.com> wrote:
> 
> Hi, experts:
> I have a question about uefi bios’s vga mode.
> Could we use VGA’s text mode to boot into uefi shell environment?
> 
> It seems vga class driver/mini port driver could support VGA’s text mode.
> 

Tiger,

You can always write a driver to produce the SipleTextOut protocol directly to produce a console on an arbitrary device. Duet may already have something close, I can't remember?

> It seems gop driver support graphic mode.
> 

Yes GOP is a graphics abstraction, and the ROM carries the the code to produce SimpleTextout on top of GOP.

> Thanks
> 
> 
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Re: Questions about uefi bios's vga mode

[Tiger Liu]

Hi, Andrew:
Thanks a lot.

best wishes,
-----邮件原件-----
发件人: afish@apple.com [mailto:afish@apple.com]
发送时间: 2017年9月1日 2:47
收件人: Tiger Liu
抄送: edk2-devel@lists.01.org
主题: Re: [edk2] [EDK2] Questions about uefi bios's vga mode


> On Aug 31, 2017, at 2:08 AM, Tiger Liu <TigerLiu@zhaoxin.com> wrote:
>
> Hi, experts:
> I have a question about uefi bios’s vga mode.
> Could we use VGA’s text mode to boot into uefi shell environment?
>
> It seems vga class driver/mini port driver could support VGA’s text mode.
>

Tiger,

You can always write a driver to produce the SipleTextOut protocol directly to produce a console on an arbitrary device. Duet may already have something close, I can't remember?

> It seems gop driver support graphic mode.
>

Yes GOP is a graphics abstraction, and the ROM carries the the code to produce SimpleTextout on top of GOP.

> Thanks
>
>
> 保密声明：
> 本邮件含有保密或专有信息，仅供指定收件人使用。严禁对本邮件或其内容做任何未经授权的查阅、使用、复制或转发。
> CONFIDENTIAL NOTE:
> This email contains confidential or legally privileged information and is for the sole use of its intended recipient. Any unauthorized review, use, copying or forwarding of this email or the content of this email is strictly prohibited.
> _______________________________________________
> edk2-devel mailing list
> edk2-devel@lists.01.org
> https://lists.01.org/mailman/listinfo/edk2-devel



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Re: Questions about uefi bios's vga mode

[Tiger Liu]

Hi, Andrew:
I have tried VgaClass driver/mini port protocol to implement a simple text out protocol.

It seems ok during bios boot phase.
I tried to use Simple text out protocol's output string function, it could output a string in the vga screen.

But, I tried to boot with shell.efi, failed to display on vga screen.
bios has finished boot, and print:
[Bds]Booting Internal EDK Shell

But the screen is blank.

Thanks

best wishes,
-----邮件原件-----
发件人: Tiger Liu
发送时间: 2017年9月1日 11:24
收件人: 'afish@apple.com'
抄送: edk2-devel@lists.01.org
主题: Re: [edk2] [EDK2] Questions about uefi bios's vga mode

Hi, Andrew:
Thanks a lot.

best wishes,
-----邮件原件-----
发件人: afish@apple.com [mailto:afish@apple.com]
发送时间: 2017年9月1日 2:47
收件人: Tiger Liu
抄送: edk2-devel@lists.01.org
主题: Re: [edk2] [EDK2] Questions about uefi bios's vga mode


> On Aug 31, 2017, at 2:08 AM, Tiger Liu <TigerLiu@zhaoxin.com> wrote:
>
> Hi, experts:
> I have a question about uefi bios’s vga mode.
> Could we use VGA’s text mode to boot into uefi shell environment?
>
> It seems vga class driver/mini port driver could support VGA’s text mode.
>

Tiger,

You can always write a driver to produce the SipleTextOut protocol directly to produce a console on an arbitrary device. Duet may already have something close, I can't remember?

> It seems gop driver support graphic mode.
>

Yes GOP is a graphics abstraction, and the ROM carries the the code to produce SimpleTextout on top of GOP.

> Thanks
>
>
> 保密声明：
> 本邮件含有保密或专有信息，仅供指定收件人使用。严禁对本邮件或其内容做任何未经授权的查阅、使用、复制或转发。
> CONFIDENTIAL NOTE:
> This email contains confidential or legally privileged information and is for the sole use of its intended recipient. Any unauthorized review, use, copying or forwarding of this email or the content of this email is strictly prohibited.
> _______________________________________________
> edk2-devel mailing list
> edk2-devel@lists.01.org
> https://lists.01.org/mailman/listinfo/edk2-devel



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本邮件含有保密或专有信息，仅供指定收件人使用。严禁对本邮件或其内容做任何未经授权的查阅、使用、复制或转发。
CONFIDENTIAL NOTE:
This email contains confidential or legally privileged information and is for the sole use of its intended recipient. Any unauthorized review, use, copying or forwarding of this email or the content of this email is strictly prohibited.