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of course - a swap to OpenBMC would be asking for trouble... but I'd image that even a new build / release of the expected firmware family would have things in different enough places to cause issues.
the robust way to implement this is pattern matching, which is pretty easy with raw code. harder with compressed code, but you'd hijack the process early (in the bootloader) and then rely on code executing on the BMC itself to do the rest of the on-the-fly patching.
