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# @(#)README.sparcboot 1.1 99/12/12 joerg
# Edited for program name change by Eduard Bloch, 2006
The sparc boot feature does allow you to create your own Sun sparc boot disk.
This will allow you to create modified Solaris install disks or to create
installation CD's for other OS that run on sparc systems.
A CD that is bootable on a Sun sparc system has a Sun disk label on sector 0
and some Sun sparc disk partitions behind the ISO-9660 filesystem image.
The layout of a sparc boot CD:
----------------------------------------------------------------------------------------------------
|Sun disk label| Iso 9660 filesystem |Generic sun4 boot|sun4c boot|sun4m boot|sun4d boot|sun4e boot|
----------------------------------------------------------------------------------------------------
On older system CD's all boot partition contain a full UFS miniroot filesystem.
On newer CD's the images on slice 2 and above only contain boot redirects to
slice 1.
To create a CD that is bootable on Sun sparc systems you need to have the
boot images for the apropriate sparc architecture.
A boot image file usually is a UFS filesystem image that contains the
primary boot image at byte offset 512 ... 8191.
You may get such boot images by extracting partitions 1..5 from a Sun Solaris install CD,
but any bootable image should work.
Here is an expample how to do this with the Solaris 7 install CD.
dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s1 of=sun4
dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s2 of=sun4c
dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s3 of=sun4m
dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s4 of=sun4d
dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s5 of=sun4e
genisoimage -R -sparc-boot sun4,sun4c,sun4m,sun4d,sun4e -o boot.img /mnt/install
Will create the bootable image in boot.img.
If you like to make the boot images smaller, you may call 'fstyp -v'
on the images and use the 'size' value to get the needed minimal
boot image size in kB.
The result for the S7 boot CD is:
ufs
magic 11954 format dynamic time Wed Oct 7 00:00:30 1998
sblkno 8 cblkno 12 iblkno 16 dblkno 252
sbsize 2048 cgsize 2048 cgoffset 20 cgmask 0xfffffff0
ncg 7 size 25704 blocks 23987
^^^^^
This is the number of interest.
bsize 8192 shift 13 mask 0xffffe000
fsize 2048 shift 11 mask 0xfffff800
frag 4 shift 2 fsbtodb 2
minfree 10% maxbpg 2048 optim time
maxcontig 256 rotdelay 0ms rps 90
csaddr 252 cssize 2048 shift 9 mask 0xfffffe00
ntrak 14 nsect 72 spc 1008 ncyl 102
cpg 16 bpg 1008 fpg 4032 ipg 3776
nindir 2048 inopb 64 nspf 4
nbfree 1768 ndir 667 nifree 24329 nffree 9
cgrotor 2 fmod 0 ronly 0
So you should call:
dd if=/vol/dev/dsk/c0t6/sol_7_sparc_sun_srvr/s1 of=sun4 bs=1k count=25704
To modify this filesystem, you can mount it using the fbk driver:
chmod +t ./sun4 # Need to do this to avoid vm cache aliasing problems
mount -F fbk -o rw,type=ufs /dev/fbk0:sun4 /mnt
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