README.sparcboot
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- 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
- mkisofs -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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