README revision 1.1 
1$NetBSD: README,v 1.1 2020/01/18 04:42:29 isaki Exp $
2
3Primary bootloaders:
4	boot_ufs/
5		contains xxboot_ufs.
6		It is placed in ffs's boot area and loads secondary bootloader
7		from its filesystem (ffsv1/v2).
8		This historical primary bootloader uses custom ffs op functions
9		and can recognize Human68k partition table.
10		(See #ifdef SCSI_ADHOC_BOOTPART part for details)
11
12	boot_ustar/
13		is placed in floppy's sector#0 and loads secondary bootloader
14		from subsequent USTARFS.
15
16	xxboot/
17		contains following variants.
18		* cdboot_cd9660
19			is placed in CD and loads secondary bootloader
20			from cd9660 filesystem.
21		* xxboot_ffsv1
22		* xxboot_ffsv2
23		* xxboot_lfsv1
24		* xxboot_lfsv2
25			is placed in each specified filesystem's boot area,
26			and loads secondary bootloader from its filesystem.
27
28		These primary bootloaders use MI ffs/lfs op functions in
29		src/sys/lib/libsa. Currently these don't recognize Human68k
30		partition table.
31
32Secondary bootloaders:
33	boot/
34		boot is placed to / (root directory) and loads the kernel.
35
36	netboot/
37		netboot is the same as /boot except default boot device is
38		nfs using network interface and DHCP.
39		Currently only NE2000 based Neptune-X and Nereid are
40		supported.
41
42Other bootloaders:
43	mboot/
44		mboot is 0-th bootloader.
45		It is placed to sector#0 (as 1024byte/sector) of hard disk
46		as an alternative to genuine boot selector.  And loads
47		active partition's +0 sector (sector size depends media)
48		which should have primary bootloader.
49
50	loadbsd/
51		loadbsd.x is a Human68k executable and loads the kernel from
52		Human68k filesystem.
53
54Utility tools:
55	newdisk/
56		newdisk is a utility to create the "disk mark" for X680x0
57		SCSI IPL using mboot bootloader to make a disk bootable.
58