On Sep 16, 2013, at 1:16 PM, Laszlo Ersek <ler...@redhat.com> wrote:
> On 09/16/13 21:50, Andrew Fish wrote: > >> OVMF: >> Limitations: Requires QEMU, serial port debugging (not well >> documented), more complex setup. > > I agree that the setup is complex. > > Regarding serial port debugging... Could you suggest how / where to > improve the documentation? "OvmfPkg/README" says > Maybe a discussion in the OVMF FAQ would be useful. http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=OVMF_FAQ. Unfortunately I've not had the time to invest in trying to get OVFM working on a Mac, so I'm not really speaking with first hand knowledge about OVMF. I found the instructions on how to enable source level debugging to be an "exercise left to the reader", at best. http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=EDK2/Source_Level_Debug. It seems like source level debugging answer is build with symbols, and configure a virtual COM port. I can see from the OvmfPkg, https://svn.code.sf.net/p/edk2/code/trunk/edk2/OvmfPkg/OvmfPkgX64.dsc, that the SourceLevelDebugPkg is used, so there is a software debugger you can compile into the EFI images.... So then we start the search.... Can't find and info about SourceLevelDebugPkg on Tianocore, so I fallback to http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=EDKII_Packages (good tip in general if you can't find something). This just points to subversion http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=SourceLevelDebugPkg I can find a readme that points to https://svn.code.sf.net/p/edk2/code/trunk/edk2/SourceLevelDebugPkg/Readme.txt The Readme.txt sends me to http://www.uefidk.com/develop After clicking on 6 or 7 incorrect links I find http://www.uefidk.com/develop/intel-uefi-tools-and-utilities/intel-uefi-development-kit-debugger-tool But at least that points back to: https://svn.code.sf.net/p/edk2/code/trunk/edk2/OvmfPkg/README, which does not talk about source level debugging :(. I think it would also be useful for new-bees to give some advice on how to use the QEMU monitor (assume people do this) to help debug OVFM. Things like `nmi cpu` could be useful to break into some point where the debugger will not let you in. > * Capturing OVMF debug messages on qemu: > - The default OVMF build writes debug messages to IO port 0x402. The > following qemu command line options save them in the file called > debug.log: '-debugcon file:debug.log -global isa-debugcon.iobase=0x402'. > - It is possible to revert to the original behavior, when debug messages > were > written to the emulated serial port (potentially intermixing OVMF debug > output with UEFI serial console output). For this the > '-D DEBUG_ON_SERIAL_PORT' option has to be passed to the build command > (see > the next section), and in order to capture the serial output qemu needs > to > be started with eg. '-serial file:serial.log'. > I was thinking more about source level debugging. With an Application (EmulatorPkg) you can use Xcode, Visual Studio, Eclipse, or some other IDE and since you are a process you can almost always break in, you fault on errors, etc.... Thanks, Andrew Fish >> Benefits: Can boot any UEFI OS! Closer to real platforms. Cross >> architecture, so you could boot an ARM VM on your X86 system. > > I wish :) > Sorry my comments were a little theoretical here, not a list of what is supported. > It's cross-platform as long as qemu-system-x86_64 / qemu-system-i386 > build & runs on your arch of choice, and TCG (tiny code generator) > doesn't choke on the OVMF binary. (Which it seemed to do the last time I > tried, alas.) > > OVMF is currently tied to i440fx/PIIX3. I think you can boot an ARM > guest in a qemu-system-arm binary that has been built for x86, but OVMF > isn't available for that guest right now. > > Thanks > Laszlo ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/20/13. http://pubads.g.doubleclick.net/gampad/clk?id=58041151&iu=/4140/ostg.clktrk _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel
