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You can’t run any old linux distro on a PowerPC mac. This is because of three fundamental reasons • The PowerPC CPU uses a totally different instruction set from x86. You simply can’t run an x86 binary on PowerPC, and nor can you run a PowerPC binary on x86. • Byte order. PowerPC uses what is known as ‘little endian’ byte order, while x86 uses ‘big-endian’. In English, this means that, in a byte, binary 1 is stored on PowerPC as: 10000000 and on x86 as: 00000001 • Hardware interfaces – Apple Macs use different busses, ports and other hardware (sound & graphics architecture) than x86 PCs. Compile Linux programs on Mac All of these problems (and a few others, but these are the main ones) must be solved before you can run software written for x86 on PowerPC.

The C compiler should, by rights, take care of points a and b. The Linux kernel is written in standard C, and can be compiled to run on the PowerPC without a problem. (This is because the source is available, and has been written and modified with the aim to run on multiple platforms).

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The PowerPC gcc compiler knows about the byte order it needs to use, and has been written specifically for the PowerPC architecture by the good folks at GNU. Problems with byte order crop up in higher level programs that have been written assuming they will be compiled on x86 – this problem is most apparent when bit-masks are heavily used to manipulate data. Watchtower library for mac 2014 download. (Heavily fictional and hypothetical example) I use a bitmask to control what permissions are set on a file. I make a byte like 00000111 and use the rightmost 3 bits (bits 1 to 3 on x86) to correspond to Read, Write and Execute permissions. This will work great on x86, but on PowerPC, the byte is stored as: 11100000.

If I use the rightmost 3 bits (bits 5 to 8 on PowerPC) of the byte, without first checking what byte order the system uses, I will end up setting all my permissions to ‘off’ when they should have been on. As you can imagine, if you haven’t made any allowances for different byte orders, you have a big problem getting your program to compile on multiple systems. Modern compilers take care of this problem to some extent, but a lot of software, especially drivers, graphical software and some other types are written only with x86 in mind and need to be modified heavily to run on PowerPC for this reason. Hardware support (problem c) is a thorny issue – While the OS can run quite happily on PowerPC, it needs to know how to communicate with the devices attached to the CPU – i.e.

To display text and graphics on a Macintosh graphics card, which were until recently quite different from a PC SVGA card. Newer PCI Macs are making steps towards solving this problem, but sound hardware, SCSI drivers, USB drivers and all the other bits that make a Mac a Mac (as opposed to another PowerPC based machine like an IBM RS/6000) need to be supported by the OS. Yellow Dog Linux (and MkLinux etc.) are major engineering feats, kudos to them. Once you have the OS running on the hardware, compiling software is easy, provided that software is written knowing about the byte order problem. You can simply recompile the application from source and get a Linux PowerPC binary which will run happily. Problems show up when programs are available only as binary – i.e.