Print from DXE_DRIVER

["David A. Van Arnem" <dvanarnem@cmlab.biz>]

Hello,

I am working on a DXE_DRIVER for a custom device.  I like to use Print()
statements to trace code execution during development.  Thus I have put
a print statement in each of my Supported(), Start(), and Stop()
functions for the driver binding protocol.  Currently I am building the
driver as part of the UefiCpuPkg, with no changes to the current
UefiCpuPkg.dsc except for adding my driver under [Components].  I have
also added the PrintLib and UefiLib to the [LibraryClasses] section in
my driver's INF file, and included the necessary headers.

When I load the driver from the shell (load <drivername>.efi), I get a
message indicating it loaded successfully, but no output from the
Print() messages.  The documentation for the shell says load should test
both the Supported() and Start() functions, so I would expect to see the
output, but I am not sure I am using the correct library instances to
accomplish this.  Is it possible to use Print() from a DXE_DRIVER, and
which library instance should I use in the UefiCpuPkg.dsc file?  If not,
would changing it to a UEFI_DRIVER help?  Any other recommendations?

If there is an example in edk2 that does this that you could point me
to, that would be sufficient as well.  Thanks!

-- 
Regards,
David Van Arnem
Development Engineer IV
Computer Measurement Laboratory, LLC