sr_meta_boot
struct sr_meta_boot *sbm;
sbm = (struct sr_meta_boot *)omi->omi_som;
struct sr_meta_boot *sbm;
omi->omi_som = malloc(sizeof(struct sr_meta_boot), M_DEVBUF,
omi->omi_som->som_length = sizeof(struct sr_meta_boot);
sbm = (struct sr_meta_boot *)omi->omi_som;
omh->som_length = sizeof(struct sr_meta_boot);