kfreebsd-amd64 ?

[Petr Salinger]

> > IIRC LinuxThreads are supported on amd64.
> > In fact LinuxThreads is the only pthread add-on available for stock Linux 2.4. 
> > Debian/amd64 choosed to support only Linux 2.6+, and choosed
> > to support only NPTL pthread implementation, not both.
> 
> So if a FreeBSD/amd64 user wants to use a Debian GNU/Linux amd64 chroot via
> Linux ABI emulation, it won't work?  

It depends on level of "Linux ABI emulation". 
syscall_futex is missing in syscalls.master, therefore it cannot be Linux 2.6 ABI.

Moreover I am afraid, that there is no linux64 emulation on FreeBSD 5.4 
at all (see amd64/conf/NOTES). 
So probably an FreeBSD/amd64 can have Debian GNU/Linux/i386 but not Debian 
GNU/Linux/amd64 chroot. 

Petr