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Old 11-04-2009, 08:31 AM   #1
fpfernando
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Can I install a 32 bit OS in a 64 bit machine ?


Hi,

I have a 32 bit machine, and I have a 64 bit OS, can I install Cent OS 5.4 (64 bit ) in that machine ?

Quote:
cat /proc/cpuinfo | grep flags
flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc up pni monitor ds_cpl est cid cx16 xtpr
Thanks in advance
Fernando
 
Old 11-04-2009, 08:36 AM   #2
pixellany
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Your title does not match what you say in the actual post....

You can put a 32-bit OS on 64-bit hardware, but not the reverse
 
Old 11-04-2009, 08:37 AM   #3
ammorais
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The short answer is no you can't.
I can't figure out a long answer except to tell you that you can freely download a 32bit version of CentosOS.

PS: I didn't noticed the title was different. The pixellany reply says it all.

Last edited by ammorais; 11-04-2009 at 08:40 AM.
 
Old 11-04-2009, 09:18 AM   #4
brianL
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It shows lm in the flags, so it is a 64bit processor:
Code:
cat /proc/cpuinfo | grep flags
flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc up pni monitor ds_cpl est cid cx16 xtpr
 
Old 11-04-2009, 11:16 AM   #5
Yaro
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Quote:
Originally Posted by brianL View Post
It shows lm in the flags, so it is a 64bit processor:
Code:
cat /proc/cpuinfo | grep flags
flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc up pni monitor ds_cpl est cid cx16 xtpr
If you're talking about installing a 32-bit Linux on a 64-bit machine, you just install it like normal. There's no trick to it.

As for 64-bit Linux on a 32-bit machine? Nothing doing. You can't do it. It's hard to explain, so I'll simplify... 32-bit processors are technically limited and cannot run or potentially even recognize 64-bit software. This is because 32-bit processors do not have the capabilities of Long Mode, which is what makes 64-bit 64-bit. You'd best find a 32-bit Linux instead.

Last edited by Yaro; 11-04-2009 at 11:18 AM.
 
Old 11-04-2009, 01:10 PM   #6
pixellany
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Why is it hard to explain??

64-bit words don't fit in 32-bit registers.

32-bit words fit into 64-bit registers with room to spare.
 
Old 11-04-2009, 01:17 PM   #7
schneidz
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it like a quart of milk can fit in a gallon container

but a gallon of milk cannot fit inside a quart container.
 
Old 11-04-2009, 01:22 PM   #8
pixellany
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Quote:
Originally Posted by schneidz View Post
it like a quart of milk can fit in a gallon container

but a gallon of milk cannot fit inside a quart container.
Well, yes, BUT:

2^64 / 2^32 = 2^32 = 4294967296 (4.295E9)

So it woul be be like putting >4 billion quarts into a 1-quart bottle.....
 
Old 11-04-2009, 01:25 PM   #9
mostlyharmless
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I suppose you could run a 64 bit emulator on a 32 bit machine, if you wanted a really slooooow machine.
 
Old 11-04-2009, 01:30 PM   #10
schneidz
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Quote:
Originally Posted by pixellany View Post
Well, yes, BUT:

2^64 / 2^32 = 2^32 = 4294967296 (4.295E9)

So it woul be be like putting >4 billion quarts into a 1-quart bottle.....
and this months nerd moment award goes to...
 
Old 11-04-2009, 01:35 PM   #11
pixellany
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Quote:
Originally Posted by schneidz View Post
and this months nerd moment award goes to...
Thank you---I accept!!!!
 
  


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