On Jan 21, 2013, at 8:42 AM, 雅虎邮箱 <linyao...@yahoo.cn> wrote:
> Hi All,
>
> I meet with some problems now.
>
> 1. I am writing an Application use EFI_FIRMWARE_VOLUME2_PROTOCOL
> (MdePkg\Include\Protocol\FirmwareVolume2.h), but when I compile it with
> VS2010 compiler, it will prompt a warning C4431, which warning that UINTN
> type is not recognized by compiler and must specify its width, like
> UINT8/UINT16/UINT32/UINT64. Could anyone give me some advices?
>
Well the MdePkg Include/Base.h includes Include/X64/ProcessorBind.h (or the
correct one for your processor type) and this contains the correct typedef for
UINTN for your processor. So if you start your include list with something
like #include <PiDxe.h> you should get UINTN properly defined.
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/MdePkg/Include/Base.h
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/MdePkg/Include/X64/ProcessorBind.h
Could it be you are passing a UINTN type to a UINT32 argument? Maybe you define
AuthenticationStatus as a UINTN?
> 2. I am trying to write Service Driver now, the function is to show system
> time on screen, but I have a problem that Driver will return EFI_SUCCESS in
> Driver Entry Point, how can I make the event of show-time still work. I don't
> understand the working mechanism of driver.
>
Your driver does not run. Your driver publishes protocols that get called by
others to do work. Your driver can register timer event that will get called
periodically. If you look in the UEFI specification Boot Services chapter you
can read about CreateEvent() and SetTimer().
In general it is not recommended that a driver write to the screen in EFI.
Thanks,
Andrew Fish
> Thanks & Best Regards!
>
> Justin Lin
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