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

[Laszlo Ersek <lersek@redhat.com>]

Hi Nikolay,

On 02/14/17 18:55, Nikolay Bodunov wrote:
> Hello
> 
> 
> I compiled DXE Driver, in DEBUG_GCC49 mode, but I can’t print any debug
> message.
> DEBUG((-1, “Print test”))  does nothing.  Exactly as
> DebugPrint(EFI_D_ERROR, “Print Test);

(1) Please always terminate the debug message with a newline ("\n") once
you are done with it. (It's okay to format a single message with several
DEBUG calls of course, and terminate only the last DEBUG with a newline.)

(2) Please use DEBUG_ERROR as the symbolic constant for the error mask.

> 
> However, I see “Print Test” string in my *.efi binary.
> I use QEMU + OMVF (OVMF was also recompliled in DEBUG_GCC49 mode, to be
> sure). Serial port output is redirected to a file:
> qemu-system-x86_64 -L . --bios /…/FV/OVMF.fd -hda hdd.img -serial
> file:./serial_file

(3) DEBUG output from OVMF is by default not written to the serial port,
it is written to the QEMU debug port. Please consult OvmfPkg/README for
specifics, namely under "Capturing OVMF debug messages on qemu".

Hope this helps,
Laszlo

> 
> All I see in output file is EFI shell output messages, include one that my
> driver was succesfully loaded. But no messages from DEBUG().
> 
> 
> My conditions:
> 
> MODULE_TYPE    = DXE_DRIVER
> 
> 
> Debug Print Library:
> 
> DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
> 
> (BaseDebugLibNull.inf is commented, of course)
> 
> 
> DebugPrintEnabled() returns TRUE
> 
> 
> I also tried to set some key options manually in MdeModulePkg.dsc
> afterwards, but result didn’t change:
> 
> 
> [Components]
> 
> 
>   MdeModulePkg/CrScreenshotDxe/CrScreenshotDxe.inf  {
> 
> 
>     <PcdsFixedAtBuild>
> 
> 
> gEfiMdePkgTokenSpaceGuid.gEfiMdePkgTokenSpaceGuid.PcdDebugPrintErrorLevel|0x07
> 
>       gEfiMdePkgTokenSpaceGuid.PcdDebugPropertyMask|0x2F
> 
>       gEfiMdePkgTokenSpaceGuid.PcdDebugPrintErrorLevel|0x80000042
> 
> 
> 
>    <LibraryClasses>
> 
> 
> DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
> 
> 
>    <BuildOptions>
> 
>       GCC:*_*_*_CC_FLAGS             = -UMDEPKG_NDEBUG
> 
> }
> 
> 
> Code (I used it as a base): https://github.com/LongSoft/CrScreenshotDxe
> 
> Where I got wrong and what else could I try to make it work?
>