diff --git a/sbin/dset/dset.c b/sbin/dset/dset.c
index 7905619e9a2d..06d71638b77f 100644
--- a/sbin/dset/dset.c
+++ b/sbin/dset/dset.c
@@ -30,6 +30,10 @@
 #include <machine/param.h>
 #include "i386/isa/isa_device.h"
 
+#include "i386/isa/pnp.h"
+struct pnp_cinfo new_ov[MAX_PNP_LDN];
+struct pnp_cinfo old_ov[MAX_PNP_LDN];
+
 #define TRUE	1
 #define FALSE 	0
 
@@ -58,6 +62,16 @@ struct nlist	nlaux[] = {
 	{""},
 };
 
+struct nlist	nlpnp[] = {
+	{"_pnp_ldn_overrides"},
+	{""},
+};
+
+struct nlist	nlconfig[] = {
+	{"config.o"},
+	{""},
+};
+
 int             quiet = FALSE;
 
 void
@@ -337,6 +351,78 @@ main(ac, av)
 		}
 	}
 
+	if (kvm_nlist(kd, nlpnp) != 0) {
+		/* pnp_ldn_overrides need not exist, only handle it if found */
+		if (verbose)
+			printf("pnp_ldn_overrides not found, ignoring.\n");
+	} else {
+		if (nlpnp[0].n_type == 0)
+			fatal("kvm_nlist", "bad symbol type");
+		/* must handle it, read and write... */
+		pos1 = nlpnp[0].n_value ;
+		if (kvm_read(kd, pos1, &new_ov, sizeof(new_ov) ) < 0 )
+			fatal("kvmread", NULL);
+		if (nlist(kernel, nlpnp) != 0)
+			fatal("nlist", NULL);
+		if (nlpnp[0].n_type == 0)
+			fatal("nlist", "bad symbol type");
+		pos = nlpnp[0].n_value + getpagesize() - entry;
+		if (lseek(f, pos, SEEK_SET) != pos)
+			fatal("seek", NULL);
+		if ((res = read(f, (char *) &old_ov, sizeof(old_ov))) <= 0 )
+			fatal("read", NULL);
+		if (testonly || bcmp(&old_ov, &new_ov, sizeof(old_ov)) ) {
+		    if (verbose) {
+			int i;
+			printf("CSN LDN conf en  irq  drq vendor_id. ....\n");
+			for (i=0; i < MAX_PNP_LDN ; i++) {
+			    if (new_ov[i].csn>0 && new_ov[i].csn<255) {
+				int maxp, maxm;
+				for (maxp=7; maxp>=0 ; maxp--)
+				    if (new_ov[i].port[maxp] !=0) break;
+				for (maxm=3; maxm>=0 ; maxm--)
+				    if (new_ov[i].mem[maxm].base !=0) break;
+				printf("%3d %3d %-4s %c ",
+				    new_ov[i].csn,
+				    new_ov[i].ldn,
+				    new_ov[i].override ? "OS":"BIOS",
+				    new_ov[i].enable ? 'y':'n');
+				printf(new_ov[i].irq[0] == 0 ? "  -":" %2d",
+				   new_ov[i].irq[0]);
+				printf(new_ov[i].irq[1] == 0 ? " - ":"%-2d",
+				   new_ov[i].irq[1]);
+				printf(new_ov[i].drq[0] == 4 ? " -":" %d",
+				   new_ov[i].drq[0]);
+				printf(new_ov[i].drq[1] == 4 ? " -":" %d",
+				   new_ov[i].drq[1]);
+				if (new_ov[i].vendor_id > 0)
+				    printf(" 0x%08x", new_ov[i].vendor_id);
+				if (new_ov[i].flags > 0)
+				    printf(" flags 0x%08x", new_ov[i].flags);
+				if (maxp >=0) {
+				    int j;
+				    printf(" port 0x%x", new_ov[i].port[0]);
+				    for(j=1;j<=maxp;j++)
+					printf(" 0x%x", new_ov[i].port[j]);
+				}
+				if (maxm >=0) {
+				    int j;
+				    printf(" mem 0x%x", new_ov[i].mem[0].base);
+				    for(j=1;j<=maxm;j++)
+					printf(" 0x%x", new_ov[i].mem[j].base);
+				}
+				printf("\n");
+			    }
+			}
+		    }
+		    if (!testonly) {
+			res = lseek(f, -(off_t) sizeof(new_ov),
+					    SEEK_CUR);
+			if (write(f,&new_ov, sizeof(new_ov)) <= 0)
+					fatal("write", NULL);
+		    }
+		}
+	}
 	if (chflags(kernel, flags) < 0)
 		fatal("chflags restore", NULL);