My fork of git://git.ipxe.org/ipxe.git, it is used for my netboot environment at home.
3392cfa7df
Some BIOSes require us to pass in not only the continuation value (in %ebx) as returned by the previous call to INT 15,e820 but also the unmodified buffer (at %es:%di) as returned by the previous call to INT 15,e820. Apparently, someone thought it would be a worthwhile optimisation to fill in only the low dword of the "length" field and the low byte of the "type field", assuming that the buffer would remain unaltered from the previous call. This problem was being triggered by the "peek ahead" logic in get_mangled_e820(), which would read the next entry into a temporary buffer in order to be able to guarantee terminating the map with %ebx=0 rather than CF=1. (Terminating with CF=1 upsets some Windows flavours, despite being documented legal behaviour.) Work around this problem by always fetching directly into our e820 cache; that way we can guarantee that the underlying call always sees the previous buffer contents (and the same buffer address). |
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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.