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57 lines
2.3 KiB
57 lines
2.3 KiB
Q: How do i build the boot loader for debugging?
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A: There are several things you must do.
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First, you must set the ENABLE_LOADER_DEBUG environment variable
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in your build window. The var must be set to a string that specifies
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the necessary debug settings for the machine that will be debugged.
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Example: ENABLE_LOADER_DEBUG=debugport=com1##debugbaudrate=115200
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Note the use of the '##' character. The NT make files replace all
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spaces in macro definitions with new lines, so you must use the
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'##' character to specify that you REALLY want a space. The above
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example enables the kernel debugger in the boot loader and sets the
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debug port to COM1 and the speed of the debug port to a baud rate
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of 115200.
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Another thing you must consider is the resulting size of the loader
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binary. The file must be kept below the 256k size or the loader will
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hang your machine. One may that you can expload the file size is
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my disabling optimizations during compilation. When you clean build
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the BOOT directory your MSC_OPTIMIZATION variable must be set to
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nothing. This enables optimizations and results in the smallest file
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size possible. If you need to disable optimizations because of
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debugging, you must do it selectivly. This means clean building the
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boot loader with optimizations enabled and then set MSC_OPTIMIZATION=/Odi
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for the compilation of selective files. Just be caureful to not
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build to much of the boot loader this way or it will quickly grow
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too large.
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If you want to build the loader as a "free" build, but also get full
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symbolic information for the debugger then use the following build
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settings:
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set NTDEBUG=ntsdnodbg
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set NTDEBUGTYPE=windbg
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set MSC_OPTIMIZATION=
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set NTDBGFILES=1
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set ENABLE_LOADER_DEBUG=debugport=com1##debugbaudrate=115200
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This will result in a free loader, with a dbg file containing full
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symbolic information that can be used by i386kd/alphakd or even
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by windbg for full source level debugging.
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Addendum:
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The following setting tells the loader to stop after loading symbols.
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set ENABLE_LOADER_DEBUG=debugport=com1##debugbaudrate=115200##DEBUGSTOP
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DbgPrint?
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To get the loader to link, you need to also build ntos\rtl with the
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ENABLE_LOADER_DEBUG flag set, otherwise DbgPrint will be unresolved.
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