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<hr><p align="left"><small>发信人: plato (纯真年代), 信区: Embedded <br>
标 题: linux for ppc chapter 4 <br>
发信站: BBS 水木清华站 (Wed May 30 23:10:16 2001) <br>
<br>
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4. Host Development Platform <br>
Embedded Linux's compelling advantage over other Embedded OS's is that your <br>
development host and target are the same. While you could theoretically deve <br>
lop your embedded Linux target system software on any host OS, Linux is the <br>
only sensible choice. Even Cygwin/UWIN is likely to waste more of your time. <br>
<br>
4.1 PowerPC <br>
Using a PowerPC based development development host platform makes life easie <br>
r, since the same binaries will run on your host and target. However, if you <br>
r choice of host platform is restricted to non-PowerPC, cross compiling adds <br>
some minor inconvenience, primarily in finding or building your own toolset <br>
. <br>
You can take binaries from a standard PowerPC-based G4 Macintosh Linux distr <br>
ibution and run them unmodified on a PowerPC embedded system provided: <br>
The binaries are dynamically linked. <br>
You use the modified dynamic runtime glibc C library, but compiled with -mha <br>
rd-float. <br>
You include the floating point math emulator in the kernel for processors su <br>
ch as the 8xx series that lack a real floating point unit. <br>
Note that for floating-point intensive applications this will invoke a perfo <br>
rmance penalty over re-compiling all the binaries and libraries; but recompi <br>
ling is what you're trying to avoid, right? <br>
Also note that standard Macintosh binaries won't work with the runtime libra <br>
ry in the Hard Hat distribution on 8xx processors, because they've been comp <br>
iled with -msoft-float to give optimum performance. In this case just use th <br>
e equivalent Hard Hat binaries instead. <br>
4.2 x86 <br>
Doing it this way is slightly more painful, but it's what most people use. <br>
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※ 来源:·BBS 水木清华站 smth.org·[FROM: 166.111.161.8] <br>
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