Re: Question about Simple Text Out Protocol

[Andrew Fish <afish@apple.com>]

> 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,
> 
> 
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