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在 2006-06-25日的 12:01 +0800，Zhang Weiwu写道： |
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> I have been using gentoo linux on my ultra-sparc U2 and U5 for two |
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> years, untill very recently I learnt the gentoo Linux is actually not |
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> 64-bit (it is 32-bit). |
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> |
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> The U2 gets broken after I upgraded OBP (when I tries Solaris 10, it |
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> prompted OBP is 32-bit OBP, I must upgrade to 64bit, then I did it, then |
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> this U2 never boots up again). I have the remaining U5 box serving as |
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> print server, it simply run out of CPU power (a single A4 brochure |
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> printing uses up CPU and caused very slow printing). I think I can run |
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> the machine in 64-bit mode, recompile related packages in 64-bit |
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> executable to regain some speed. |
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> |
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> I tried to adjust C-flags: |
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> |
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> CFLAGS="-O2 -m64 -mcpu=ultrasparc -fomit-frame-pointer -pipe" |
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> (added -m64) |
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> |
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> then emerge a package, get this error: |
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> |
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> checking whether the C compiler (gcc -O2 -m64 -mcpu=ultrasparc |
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> -fomit-frame-pointer -pipe ) works... no |
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> |
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> I think perhaps it is not possible to compile anything in 64-bit |
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> executable when the kernel itself is running in 32-bit mode. Perhaps it |
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> is not possible to run 64-bit code on 32-bit kernal at all (if this |
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> sounds obvious, I admit I am a newbie). So what should I do? Should I |
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> try to compile a kernel with -m64 first? Then there comes another |
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> question: can 32-bit OBP loads 64bit kernel? I don't know if I have 64 |
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> OBP at all (and don't know how to tell it), my other U2 has had 32bit |
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> OBP, that's for sure. |
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> |
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> and even if I try to compile a 64-bit kernel, that may as well not |
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> possible because it seems gcc refuse to run with -m64 (the error message |
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> above). |
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> |
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> Besides, is 64-big executable much faster then 32-bit executable? |
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> |
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> P.S. I bet there must be an article somewhere on the Internet telling |
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> how to get 64-bit linux running on sparcs, only that I didn't find it. |
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> |
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|
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an example of trying to run gcc with -m64 on 32bit system: |
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|
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sappho ~ # touch abc #creates 0byte file abc |
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sappho ~ # gcc -O2 -m64 -mcpu=ultrasparc -fomit-frame-pointer -pipe abc |
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/usr/lib/gcc/sparc-unknown-linux-gnu/3.4.4/../../../crt1.o(.text+0x10): |
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In function `_start': |
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: undefined reference to `main' |
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/usr/lib/gcc/sparc-unknown-linux-gnu/3.4.4/../../../crt1.o(.text+0x1c): |
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In function `_start': |
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: undefined reference to `main' |
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collect2: ld returned 1 exit status |
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-- |
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