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From BIOS to /etc/init.d/rcS
CPU | V +------------------BIOS----------------+ | | | | V V V V Floppy Hard Disk Versatile PXE (4) set (3) DVD/CD-ROM <- Floppy (2) --> or | USB key WEB boot V V | +-------------+ +--------------+ | V | V PXE forwarder (5) V Boot Sector | | | V | +-------------------------------+ | Already running Kernel V V | +------KEXEC (8) Boot loader | | +-----+------------+---------+ | | V V Frugal/Uncommon(1): Installed: load Kernel+initramfs load Kernel only | | V V +--------Run /init -------------+ | | | | Mount root | V | filesystem | Create tmpfs | | | | | | | | V V V V | Loram(7): Frugal: Uncommon(1): | | Mount aufs populate run script | | & squashfs tmpfs load modules(s) | | | | mount root | | | | | | V +------------+------------+ | | | | +------+ V V | Switch to new root | | | | | +----------------+ Tiny SliTaz(6): | | V | Run /sbin/init | | +----------------------+ | V Run /etc/init.d/rcS from /etc/inittab
- Uncommon is LVM, RAID, crypto, loop or subdir mount with preinit rootfs.
- Tiny slitaz, see http://tiny.slitaz.org/
- kexec command from the kexec-tools package.
SliTaz ISO image boot tricks
The cdrom image has a hybrid format from version 5.0.
- It boots from a cdrom drive according to the el-torito specification as usual
- It boots from a memory card / USB key using the syslinux hybrid format
- It launches a USB boot key creation utility from Windows (32 bits)
- It can boot from DOS (in real mode only) directly:
C:\> ren slitaz.iso slitaz.exe C:\> slitaz.exe
The files bzImage, memtest and ipxe can boot with DOS too:
C:\> ren bzimage bzimage.exe C:\> bzimage.exe root=/dev/hda3 autologin
C:\> ren memtest memtest.exe C:\> memtest.exe
C:\> ren ipxe ipxe.exe C:\> ipxe.exe http://myserver.org/boot.php
- It is easily customizable with the iso2exe (compatible with taziso or tazpanel/boot/ISO mine) tool:
iso2exe -a " lang=fr_FR kmap=fr-latin1 tz=Europe/Paris" -i myconfig.gz slitaz.iso iso2exe -l slitaz.iso iso2exe -r slitaz.iso custom.append custom.initrd taziso slitaz.iso getcustomconf
You can tune the boot process the your own /init script:
#!/bin/sh grep ^RUN_DAEMONS= /etc/rcS.conf | grep -q dropbear || sed -i 's,^RUN_DAEMONS=",RUN_DAEMONS="dropbear ,' /etc/rcS.conf cat >> /etc/init.d/local.sh <<EOM /my/special/inits.sh EOM exec /init "$@"
Update the kernel command line:
iso2exe -a " rdinit=/myinit lang=fr_FR kmap=fr-latin1 tz=Europe/Paris" -i myconfig slitaz.org -f