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README.scsi
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129
README.scsi
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This file explains how to install EMILE to boot from a SCSI disk.
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first of all:
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USE WITH CAUTION AND AT YOUR OWN RISKS !!!!!
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This operations will modify properties of your partition map (if you haven't got HFS partition) or the bootblock of your HFS partition (if exists)
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If you generate binaries from sources packages, you must:
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# cp emile/tools/emile /sbin
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# mkdir /boot/emile
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# cp first/first_scsi /boot/emile
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# cp second/second_scsi /boot/emile
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The first operation to do is to show the state of your partition map:
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emile2:~# emile --scanbus -v
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/dev/sda: block size: 512, blocks number: 528808 (258.207 MB)
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Drivers
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0: base: 64 size: 19 type: 1 <2: Macintosh [Apple_Driver43]>
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Partitions
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/dev/sda1 : Apple [Apple_partition_map]
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base: 1, count: 63 (31.500 kB)
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flags: 0x00000037
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/dev/sda2 : Macintosh [Apple_Driver43 ] *
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base: 64, count: 32 (16.000 kB)
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flags: 0x0000007f
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/dev/sda3 : A/UX Root [Apple_UNIX_SVR2 ]
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base: 182864, count: 345944 (168.917 MB)
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flags: 0x00000037
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/dev/sda4 : Swap [Apple_UNIX_SVR2 ]
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base: 150096, count: 32768 (16.000 MB)
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flags: 0x00000037
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/dev/sda5 : MacOS [Apple_HFS ] <Apple bootblock>
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base: 96, count: 150000 (73.242 MB)
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flags: 0x000000b7
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The aim of the operation is to install the EMILE bootblock on the first HFS
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partition of the disk and to set information in it to find the second level
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boot block. Then with set information in second level to find the kernel. All
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is done automtically by emile.
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But you need a kernel... you can use the one provided with your Debian after a little modification: move it from ELF format to binary format.
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# cd /boot
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# gzip -d -c vmlinuz-2.2.20-mac > vmlinux-2.2.20.tmp
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# objcopy -I elf32-big -O binary -R .note -R .comment \
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-S vmlinux-2.2.20.tmp vmlinux-2.2.20
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# rm vmlinux-2.2.20.tmp
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You can compress if with gzip if you want, but you have enough space on your
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disk, let it uncompressed: the boot sequence will be faster.
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Now, we have a kernel, we can install EMILE !
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You can test operation without modifying anything with parameter "--test".
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emile2:~# emile --test --kernel /boot/vmlinux-2.2.20
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ERROR: there is already a bootblock on "/dev/sda5"
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you must use "--backup" to save it
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partition: /dev/sda5
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first: /boot/emile/first_scsi
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second: /boot/emile/second_scsi
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kernel: /boot/vmlinux-2.2.20
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append: root=/dev/sda3
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buffer size: 0
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As we try to avoid to lost the Apple bootblock, EMILE check it and did nothing
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if you don't explicitly backup it.
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Now, we can really install EMILE:
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emile2:~# emile --kernel /boot/vmlinux-2.2.20 --backup
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Bootblock backup successfully done.
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partition: /dev/sda5
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first: /boot/emile/first_scsi
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second: /boot/emile/second_scsi
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kernel: /boot/vmlinux-2.2.20
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append: root=/dev/sda3
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buffer size: 0
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(352374, 24) (352400, 512) (352916, 512) (353430, 484) (353930, 28) (353960, 512) (354474, 512) (354988, 72) (357750, 234) (372902, 38) (373522, 18) (373542, 20) (373564, 20) (373586, 20) (373608, 10)
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kernel image size: 1544192
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(314486, 24) (314512, 16) (182864, 2) (182864, 2) (182864, 2) (182864, 2) (314528, 16)
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Note: by default, EMILE installs bootblock on first HFS partition, and set
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"root=" to the partition where is stored second_level.
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You can specify all parameters, see emile usage:
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emile2:~# emile --help
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Usage: emile [OPTION]
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Update and install EMILE stuff on your SCSI disk.
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EMILE allows to boot linux directly from linux partition
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-h, --help display this text
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-v, --verbose active verbose mode
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-t, --test active test mode (don't write to disk)
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--scanbus display information about all disks and partitions
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-f, --first PATH set path of EMILE first level
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-s, --second PATH set path of EMILE second level
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-k, --kernel PATH set path of kernel
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-a, --append ARG set kernel command line
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-p, --partition DEV define device where to install boot block
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--restore[=FILE] save current boot block from FILE
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--backup[=FILE] save current boot block to FILE
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--set-hfs set type of partition DEV to Apple_HFS (needed to be bootable)
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If you want to boot MacOS again (sure ?), you must restore the Apple bootblock
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with:
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emile2:~# emile --restore
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Bootblock restore successfully done.
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"--backup" saves by default bootblock in "/boot/emile/bootblock.backup"
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But remember, to be bootable, a disk must have:
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- a partition map
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- an Apple_Driver partition
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- an Apple_HFS partition
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- a bootblock on Apple_HFS
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EMILE cannot create an Apple_Driver partition, so you must partition before
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all your disk with the Apple Disk Utility.
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If you don't want to have MacOS on your disk, EMILE can change the linux root
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partition to HFS... and all works fine ;-)
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And now, you can start linux in less than 2 seconds...
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Laurent Vivier <LaurentVivier@wanadoo.fr>
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