boot_device
boot_device(&booted_device, &booted_unit, &fd_format);
boot_device(&__dk_type, &__dk_unit, &fd_format);
void boot_device(int *, int *, int *);
boot_device(&__disk.type, &__disk.unit, &__disk.format);
device_t boot_device = NULL;
boot_device = dev;
boot_device = dev;
if (device_is_a(dev, "ppb") && boot_device == device_parent(pdev)) {
boot_device = dev;
if (device_is_a(pdev, "pci") && boot_device == device_parent(pdev)) {
boot_device = dev;
boot_device == device_parent(pdev)) {
boot_device = dev;
if (boot_device != NULL)
printf("boot device: %s\n", device_xname(boot_device));
booted_device = boot_device;