Hi!

I would like to know why the kernel forces the single-user flag for init
if root is on a memory disk?

All floppy images use the small init that only does single-user anyway, so
it seems this behavior is superfluous. This kinda bit me since I wanted to
have /etc/rc run on my memory disk using standard init.

Here is the responsible code (sys/arch/i386/i386/md_root.c:71):

/*
 * This is called during open (i.e. mountroot)
 */   
void
md_open_hook(unit, md)
	int unit;
  	struct md_conf *md;
{
  	if (unit == 0) {
                /* The root ramdisk only works single-user. */
   		boothowto |= RB_SINGLE;
    	}
}

/Andreas