Peter Cordes wrote: > That's totally bogus. Nothing depends on the hardware of the computer the > kernel is compiled on. With a cross-compiler, you should be able to use a > fast PPC to compile a kernel on an old x86 laptop.
This was not meant to imply that you couldn't compile a kernel on the Pismo for the Titanium, however, I haven't done any or seen any testing. I've seen mixed results of ppc linux running on the G4. So, I certainly wouldn't commit to code being able to run on the Titanium, since it has a different chip. Latest report is that it runs fine, but I don't know if that is for the 400mhz or 500mhz or just what. They should be the same, but there could be some timing issues arise, I don't know. > The .config files are the only confusing part. I usually copy .config to > /usr/src/machinename.conf when I'm done. Yes, and the main reason I don't like to do that...because if you forget to copy the .config and build a bad kernel for the wrong machine, it could cause problems as the two PowerBooks will probably not be configured the exact same. In this case they will be slightly different, but similar. Call this part of me, paranoia. Providing you always remember the host is compiling for two targets, it shouldn't be a problem. > I use my P200MMX desktop machine > to compile kernels for my slower x86 machines, a P75 and a 486 laptop. The > laptop didn't (until a recent factor-of-20 upgrade to disk space :) have > enough room for the kernel source tree, and it would have taken all day to > compile 2.4.2 on it with 20MB of RAM. My PPC machine compiles its own > kernel, because it's easier to do that than install a cross compiler to > compile my x86 kernels on it. You can do it, no question. But for myself, I would rather compile my kernel on the native machine it is running on. I don't compile kernels all that often on my development machines. If there wasn't any problem moving kernels to other chipsets, we wouldn't need the cross-compiler to begin with. I do use the cross-compiler on x86 architecture to produce a ppc 823 target, and compress images that can be flashed over the net, but this will only work with the cross-compiler unless you were using a 823 host (now that would be painful to build kernels). But I *believe* compiling for an 823 target on a 750 host (Pismo) requires that you use a cross compiler, that's how I do it. As a side, do you know that a PPC host running the cross-compiler produces different size binaries than an x86 host running the cross-compiler will produce with the exact same code and compiler revs? Both seem to run fine on the target, but size is different. Due to my ignorance in differences between a G3 and G4, I would certainly opt to compile the G4 on the native processor given the problems I've seen on getting ppc linux to run on the G4 Titanium anyway, call me old fashioned... -- Alan DuBoff Software Orchestration, Inc.
