swap=<device> kernel commandline

===== Original Message From [email protected] (Eric W. Biederman) =====

Quoted 11 lines · Werner Almesberger

Quoted 3 lines · Eric W. Biederman

I have one that loads a second kernel over the network using dhcp to configure it's interface and tftp to fetch the image and boots that is only 20kb uncompressed....

Neat ;-) My goal is actually not only size, but also to have a relatively normal build environment, e.g. my example is with shared newlib, regular ash, and - unfortunately rather wasteful - glibc's ld.so.

But a tftp loader in 20kB is rather good. Now the next challenge is the same thing with NFS. Then we can finally kill nfsroot ;-)

Hmm. What does it take to mount an NFS partition?

Anyway. All I did was wrote a tiny libc that is just a bunch of wrappers for syscalls, and some string functions. Then I just wrote a straight forward C program to do the job. Except for my added kexec call I can compile with glibc :)

Now if glibc wouldn't link in 200k of unused crap when you make a trivial static binary I'd much prefer to use it...

Though I wish it was possible to have a ramfs preloader instead of initrd. An initramfs would allow me to not even compile in the block device driver layer, and be more efficient.