safe way to build i386 arch makeworld on amd64 arch?

[patrick]

Thanks all for feedback.

i did some tresstesting on apache and it seems like 'perfoming well'
I guess the best option for me is just add some more memory ;)


Enjoy!

grtz
patrick


>>>> is there a save way to 'downgrade' an amd64 build system by using 'make world' ?
>>>>
>>>> e.g. just remove the CPUTYPE=opteron from the make.conf file and do a
>>>> build world/kernels install world/kernels ?

>>
>> To downgrade? Not realistically.
>>
>> That would certainly allow him to crosscompile an i386 kernel, and
>> world, but wouldn't have much effect on downgrading from AMD64 to
>> i386, since you run into a chicken or the egg problem with the kernel,
>> and world. (a 64-bit kernel does not play nice on a 32-bit world,
>> without some hacking around, and a 32-bit kernel does not play nice on
>> a 64-bit world), which makes it impossible to actually do both steps.
>>
>> If you install the 32-bit kernel first, and reboot, the kernel won't
>> be able to run the 64-bit binaries. If you install the 32-bit world
>> first, the 64-bit kernel will become very, very sad, and won't let the
>> installation complete.
>>
>> If you try to install the kernel, then the world without a reboot, you
>> have the same problem as installing the 32-bit world first, since even
>> with a 32-bit kernel installed, you're still RUNNING the 64-bit kernel
>> until you reboot.
>>
>> There are actually ways to do this, but its almost always a bad idea.
>> Not to mention this will break any packages, or ports you're using
>> too, with the exception, perhaps, of Linux Compat.

> You are of course correct, but then again, I did mention DESTDIR=
> and MAKEOBJDIRPREFIX.
>
> personaly, machines that are not diskless, i tend to have 2 root slices
> (it only needs some 500 Mgb), and install on a non active slice/partition, then
> i do 'boot0cfg -sn device'. When that fails i do have to go to the console
> and reboot from the old partition :-(, this is nice if the console is
> walking distance away ...