Hi Andrew,
Thanks for your reply!
I have completed the service driver, but about the application using
EFI_FIRMWARE_VOLUME2_PROTOCOL, I have some new problems.
I have seen your reply of the topic locating and dumping the BIOS firmware
(edk2-devel Digest, Vol 37, Issue 97 ) which is launched by cruxpot, its the
same task I want to complete:
Since my last email, I was able to write platform-specific code that can
access the firmware from an X64 platform and extract it. Is there a way to
extract and/or dissect the FV or FVs that have the SEC and PEI Core for a
given .FD or .ROM file (assume I have no corresponding .FDF file and do not
know the structure)? The goal here is to do some integrity checks on key
files or modules that are consistent and do not change (unless they are
updated). I want to ignore sections of the ROM that have volatile data that
changes frequently such as firmware settings changes, the clock, etc.. (write
by cruxpot)
And your reply is like this:
UEFI is focused on defining the interfaces to option ROMs and OS loaders,
>> and pushing policy decisions, where possible, in the platform firmware.
>> UEFI tends to not define how the construct the platform Firmware. The UEFI
>> PI specs go into more detail of firmware construction, but mostly so
>> modules can interoperate. PI does not focus on things that are higher level
>> platform firmware features.
>>
>> The PI terminology is FD (Flash Device) and there is no way to access the
>> FD programmatically. The platform firmware produces FVs (Firmware Volumes)
>> out of the FD in PEI (memory discovery/S3) and DXE (EFI services) phases.
>> The FV containing the SEC and PEI Core are often executed directly from the
>> FD, but most other FVs are compressed. This is all done via platform
>> specific code. (On Mon, Dec 3, 2012 at 5:35 PM)
My question is that, I tried to use EFI_FIRMWARE_VOLUME2_PROTOCOL in my
application, but it can not be include like other protocol, the build will
prompt errors and warnings, and I found that only the core of DXE phase can use
this protocol normal, just as your reply above. Moreover, there are no
information about this protocol in UEFI Spec.
So how can I complete the task of extract and/or dissect the BIOS ROM Image (FD
or FV)? Could you give me some advices!
Thanks & Best Regards!
Justin Lin
发件人： Andrew Fish
发送时间： 2013-01-22 01:35
收件人： linyao_71
抄送： edk2-devel
主题： Re: Some Problems about driver and UINTN
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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