Re: DEBUG() macros in DXE driver: can’t make it work in QEMU

[Laszlo Ersek <lersek@redhat.com>]

On 02/15/17 01:00, David A. Van Arnem wrote:
> 
> 
> On 02/14/2017 04:46 PM, Nikolay Bodunov wrote:
>> Hi
>>
>> I red this topic before asking the question in the maillist. Unfortunately,
>> it's not for DXE phase.
>> I even tried to use it and recieved expected compiler error:
>>
>> error 1001: Module type [PEIM] is not supported by library instance
>> [/home/nick/src/edk2/MdePkg/Library/UefiDebugLibConOut/
>> UefiDebugLibConOut.inf]
>>     consumed by [/home/nick/src/edk2/MdeModulePkg/Bus/Pci/
>> SdMmcPciHcPei/SdMmcPciHcPei.inf]
> 
> Hi,
> 
> MdePkg/Library/UefiDebugLibConOut/UefiDebugLibConOut.inf lists
> DXE_DRIVER in its [Defines] section under LIBRARY_CLASS, so it is
> compatible with DXE_DRIVER module types (I have used it this way).
> However, if I'm reading your output correctly, you are trying to build a
> PEI module which is why you are getting the error.  PEI is outside of my
> knowledge.

In the PEI phase, no such thing exists as "system console" (that's a
UEFI construct), hence the fact that UefiDebugLibConOut (which prints to
said console) rejects being linked into PEIMs (PEI modules) is justified.

Again, a suitable DebugLib instance should be chosen (in the DSC file
where the PEIM in question is listed too, resolving the DebugLib class
for PEIMs), and DEBUG() macros should be used for logging.

Thanks
Laszlo