Hoi Louis, please explain the hack / patch: Is the only thing that you changed that the kernel is compiled for those CPUs? Are there actually any differences between them? I can imagine that OpenWatcom makes 186 and 286 the same and everything above 386 the same. Unless the kernel would contain heavy mathematical processing for which it is obvious that above-386 optimizes better ;-) You could tell the compiler to produce Assembly output (instead of binary) and compare the text. Or you could use some debug, disassembler (ndisasm?) or hex editor to compare before you UPX things, but of course that is more work.
Thanks for comparing :-) Maybe this is more a topic for the kernel list. Note that if "a few" bytes are really only 10 or so, all this is probably more an "academic" exercise. Things get more exciting once you can save at least a cluster of disk space or a paragraph of RAM :-) Regards, Eric > I hacked the 2041 kernel batch and make files included on the FD 1.1 iso to > allow the kernel to be built by OpenWatcom as 8086, 186, 286, 386, 486, > 586, or 686. The resulting 686 kernel boots fine in VirtualBox 4.2.12 in > OSX 10.8.3 on my 2012 Mac Book Air 13" 4GB. The resulting kernel is a few > bytes smaller compressed by upx than kernel installed by the FD 1.1 iso. > I'm going to continue testing. No source changes were made. Not sure how > the changes affect the nasm built files. ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite It's a free troubleshooting tool designed for production Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap2 _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
