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xCAT Network Boot Agent
9acf442c20
Current gPXE code always returns "OURS" in response to PXENV_UNDI_ISR:START. This is harmless for non-shared interrupt lines, and avoids the complexity of trying to determine whether or not we really did cause the interrupt. (This is a non-trivial determination; some drivers don't have interrupt support and hook the system timer interrupt instead, for example.) A problem occurs when we have a shared interrupt line, the other device asserts an interrupt, and the controlling ISR does not chain to the other device's ISR when we return "OURS". Under these circumstances, the other device's ISR never executes, and so the interrupt remains asserted, causing an interrupt storm. Work around this by returning "OURS" if and only if our net device's interrupt is currently recorded as being enabled. Since we always disable interrupts as a result of a call to PXENV_UNDI_ISR:START, this guarantees that we will eventually (on the second call) return "NOT OURS", allowing the other ISR to be called. Under normal operation, including a non-shared interrupt situation, this change will make no difference since PXENV_UNDI_ISR:START would be called only when interrupts were enabled anyway. Signed-off-by: Michael Brown <mcb30@etherboot.org> |
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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.