> > By this change, my floppy drive is reporting an error. From dmesg:
> >
> > fdc0: can't set up ISA DMA map
> 
> As you have provided absolutely no context, I'm going to mostly ignore
> this "bug report".

In my case, the failed operation was uvm_pglistalloc() in
_bus_dmamem_alloc_range() (x86/x86/bus_dma.c).

Since fdcattach() is now called after i386_bufinit() (which is called
via cpu_configure()), I guess the memory below the 16M was eaten by
bufcache as described in the comment in the cpu_startup().

enami.