Question about Simple Text Out Protocol

Question about Simple Text Out Protocol

[Tiger Liu]

Hi, experts:
I am debugging vga class driver/mini port protocol.

I found:

1.      vgaclass driver will install Simple txt out protocol

2.      ConSplitter driver will also install simple txt out protocol

and ConSplitter driver’s simple txt out protocol implementation will override vga class driver?

Thanks

best wishes,


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Re: Question about Simple Text Out Protocol

[Andrew Fish]

> On Sep 1, 2017, at 2:07 AM, Tiger Liu <TigerLiu@zhaoxin.com> wrote:
> 
> Hi, experts:
> I am debugging vga class driver/mini port protocol.
> 
> I found:
> 
> 1.      vgaclass driver will install Simple txt out protocol
> 
> 2.      ConSplitter driver will also install simple txt out protocol
> 
> and ConSplitter driver’s simple txt out protocol implementation will override vga class driver?
> 

The ConSplittler is the primary EFI console device and it is the console referenced in the EFI System Table. The Conpliter is the main EFI Console and it follows the policy of the EFI NVRAM variables. You may need to make sure the BDS adds the device path for the VGA SimpleTextOut to the ConOut EFI Variable. 

Thanks,

Andrew Fish


> Thanks
> 
> best wishes,
> 
> 
> 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.
> _______________________________________________
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Re: Question about Simple Text Out Protocol

[Tiger Liu]

Hi, Andrew:
Thanks.

It's really the root cause.

best wishes,
-----邮件原件-----
发件人: afish@apple.com [mailto:afish@apple.com]
发送时间: 2017年9月3日 5:35
收件人: Tiger Liu
抄送: edk2-devel@lists.01.org
主题: Re: [edk2] Question about Simple Text Out Protocol


> On Sep 1, 2017, at 2:07 AM, Tiger Liu <TigerLiu@zhaoxin.com> wrote:
>
> Hi, experts:
> I am debugging vga class driver/mini port protocol.
>
> I found:
>
> 1.      vgaclass driver will install Simple txt out protocol
>
> 2.      ConSplitter driver will also install simple txt out protocol
>
> and ConSplitter driver’s simple txt out protocol implementation will override vga class driver?
>

The ConSplittler is the primary EFI console device and it is the console referenced in the EFI System Table. The Conpliter is the main EFI Console and it follows the policy of the EFI NVRAM variables. You may need to make sure the BDS adds the device path for the VGA SimpleTextOut to the ConOut EFI Variable.

Thanks,

Andrew Fish


> Thanks
>
> best wishes,
>
>
> 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.