1# @(#)README.sparcboot 1.1 99/12/12 joerg 2# 3The sparc boot feature does allow you to create your own Sun sparc boot disk. 4This will allow you to create modified Solaris install disks or to create 5installation CD's for other OS that run on sparc systems. 6 7A CD that is bootable on a Sun sparc system has a Sun disk label on sector 0 8and some Sun sparc disk partitions behind the ISO-9660 filesystem image. 9 10The layout of a sparc boot CD: 11 12---------------------------------------------------------------------------------------------------- 13|Sun disk label| Iso 9660 filesystem |Generic sun4 boot|sun4c boot|sun4m boot|sun4d boot|sun4e boot| 14---------------------------------------------------------------------------------------------------- 15 16On older system CD's all boot partition contain a full UFS miniroot filesystem. 17On newer CD's the images on slice 2 and above only contain boot redirects to 18slice 1. 19 20To create a CD that is bootable on Sun sparc systems you need to have the 21boot images for the apropriate sparc architecture. 22 23A boot image file usually is a UFS filesystem image that contains the 24primary boot image at byte offset 512 ... 8191. 25 26You may get such boot images by extracting partitions 1..5 from a Sun Solaris install CD, 27but any bootable image should work. 28 29Here is an expample how to do this with the Solaris 7 install CD. 30 31dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s1 of=sun4 32dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s2 of=sun4c 33dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s3 of=sun4m 34dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s4 of=sun4d 35dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s5 of=sun4e 36 37 38mkisofs -R -sparc-boot sun4,sun4c,sun4m,sun4d,sun4e -o boot.img /mnt/install 39 40Will create the bootable image in boot.img. 41 42If you like to make the boot images smaller, you may call 'fstyp -v' 43on the images and use the 'size' value to get the needed minimal 44boot image size in kB. 45 46The result for the S7 boot CD is: 47 48ufs 49magic 11954 format dynamic time Wed Oct 7 00:00:30 1998 50sblkno 8 cblkno 12 iblkno 16 dblkno 252 51sbsize 2048 cgsize 2048 cgoffset 20 cgmask 0xfffffff0 52ncg 7 size 25704 blocks 23987 53 ^^^^^ 54 This is the number of interest. 55bsize 8192 shift 13 mask 0xffffe000 56fsize 2048 shift 11 mask 0xfffff800 57frag 4 shift 2 fsbtodb 2 58minfree 10% maxbpg 2048 optim time 59maxcontig 256 rotdelay 0ms rps 90 60csaddr 252 cssize 2048 shift 9 mask 0xfffffe00 61ntrak 14 nsect 72 spc 1008 ncyl 102 62cpg 16 bpg 1008 fpg 4032 ipg 3776 63nindir 2048 inopb 64 nspf 4 64nbfree 1768 ndir 667 nifree 24329 nffree 9 65cgrotor 2 fmod 0 ronly 0 66 67So you should call: 68 69dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s1 of=sun4 bs=1k count=25704 70 71To modify this filesystem, you can mount it using the fbk driver: 72 73chmod +t ./sun4 # Need to do this to avoid vm cache aliasing problems 74 75mount -F fbk -o rw,type=ufs /dev/fbk0:sun4 /mnt 76 77