Apply by doing:
       cd /usr/src
       patch -p0 < 003_bus_dma.patch

Then build and install a new kernel.

Index: sys/arch/i386/i386/bus_dma.c
===================================================================
RCS file: /cvs/src/sys/arch/i386/i386/bus_dma.c,v
retrieving revision 1.3
diff -u -p sys/arch/i386/i386/bus_dma.c
--- sys/arch/i386/i386/bus_dma.c        5 Feb 2009 01:13:21 -0000       1.3
+++ sys/arch/i386/i386/bus_dma.c        24 Apr 2009 13:54:31 -0000
@@ -370,6 +370,7 @@ _bus_dmamem_map(bus_dma_tag_t t, bus_dma_segment_t *se
       bus_addr_t addr;
       int curseg, pmapflags;

+       pmapflags = VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED;
       if (flags & BUS_DMA_NOCACHE)
               pmapflags |= PMAP_NOCACHE;

@@ -387,9 +388,7 @@ _bus_dmamem_map(bus_dma_tag_t t, bus_dma_segment_t *se
                       if (size == 0)
                               panic("_bus_dmamem_map: size botch");
                       pmap_enter(pmap_kernel(), va, addr,
-                           VM_PROT_READ | VM_PROT_WRITE,
-                           VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED |
-                           pmapflags);
+                           VM_PROT_READ | VM_PROT_WRITE, pmapflags);
               }
       }
       pmap_update(pmap_kernel());

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