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xCAT Network Boot Agent
2ca2607b1b
The only way that PMM allows us to request a block in a region with A20=0 is to ask for a block with an alignment of 2MB. Due to the PMM API design, the only way we can do this is to ask for a block with a size of 2MB. Unfortunately, some BIOSes will hit problems if we allocate a 2MB block. In particular, it may not be possible to enter the BIOS setup screen; the BIOS setup code attempts a PMM allocation, fails, and hangs the machine. We now try allocating only as much as we need via PMM. If the allocated block has A20=1, we free the allocated block, double the allocation size, and try again. Repeat until either we obtain a block with A20=0 or allocation fails. (This is guaranteed to terminate by the time we reach an allocation size of 2MB.) |
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gPXE README File gPXE is an implementation of the PXE specification for network booting, with extensions to allow additional features such as booting via HTTP, iSCSI, and AoE. In generally, gPXE is compatible with the industry-standard PXE specification, and also supports Etherboot .nbi file loading and some additional protocols and features. For more detailed information about gPXE, please visit our project website at: http://etherboot.org/ BUILDING gPXE IMAGE FROM SOURCE If you don't want to install development tools, and have access to the Web, you can get gPXE and Etherboot ROM images made on demand from http://rom-o-matic.net/ If you would like to compile gPXE images from source, here are some tips. We normally compile gPXE images on x86, 32-bit Linux machines. It is possible to also use x86-64 machines. We use gcc compiler options to create 32-bit output. It is important to have the necessary software packages installed. A gcc-based toolchain is required. The following packages (at least) are required: - a gcc tool chain (gcc 3.x or gcc 4.x) - binutils - perl - syslinux - mtools To test your environment, cd to the "src" directory and type: make You should see a lot of output, and when it stops, the "bin" directory should be populated with gPXE images and object files. To learn more about what to build and how to use gPXE, please visit our project website at http://etherboot.org/ , particularly the "howto" section. CONTACTING US Pointers to our project mailing lists are on http://etherboot.org/ Real-time help is often available on IRC on the #etherboot channel of irc.freenode.net.