1 /* $NetBSD: README,v 1.2 2021/08/17 22:00:31 andvar Exp $ */ 2 3 The sun bootblocks are split into two parts: a small 1st-level program that 4 gets written right after the superblock in a partition (and is hence limited 5 in size to SBSIZE - DEV_BSIZE bytes), and a 2nd-level program that resides 6 in the filesystem proper. 7 8 The 1st-level program is loaded into memory by the PROM. It loads the second 9 stage program from a set of filesystem block numbers that are hard-coded 10 into it by the `installboot' program. The prototype code for the 1st-level 11 bootblocks are in `bootxx'. 12 13 The 2nd-level program (`ufsboot') is normally installed in the root FS 14 as `/ufsboot'. It uses the device drivers in the PROM and the stand-alone 15 filesystem code in `libsa.a' to locate and load the kernel. 16 17 Use the following command to install the 1st-level bootblocks in the 18 root filesystem (on `sd0a') using the file `/boot' as the second level 19 boot program: 20 21 mount /dev/sd0a /mnt 22 cd /usr/mdec 23 cp -p ufsboot /mnt/ufsboot 24 sync ; sleep 1 ; sync 25 ./installboot -v /mnt/ufsboot bootxx /dev/rsd0a 26 27 The above only works with securelevel <= 0 (see init.8 manual). 28 29 Status: 30 31 netboot works. 32 33 bootxx, installboot are tested and working. It would be nice if 34 installboot would find the inumber for the 2nd stage boot program 35 without having the filesystem mounted so this command can work 36 with securelevel==1 (the default). Doing this requires adding 37 code to read and do a directory lookup in the root... 38 39
Indexes created Sat Sep 20 22:09:52 GMT 2025