1) Hard Reset
This is what happens the first
time the Z is loaded.
2) Magic Happens (This part isn't documented - Yet)
I'm gussing the boot loader located at FLASH memory address
0x00000000 is executed. This part of the Z containes lots of hidden options.
One is the "CD" keyboard process to jump to the FLASH memory manager.
It at some point the Linux kernel 'init' function is called.
4) The kernel run
I'd like more information on just how the kernel is started
and if it is any different then one executed on a workstation. I'm
thinking it must be because it is run in place.
5) The root file system is mounted read only.
This 'disk' space is realy FLASH memory. It is only updated
by the load process.
For information about what is contained in FLASH see the documentaion on
ROM image layout.
6) The init program is executed
7) init runs /etc/rc.d/rc.sysinit
Here is where things start getting confusing. The Z uses
lots of sim links.
At this point in the process /etc is not /etc. It is a sim link to
/home/etc witch is itself a simlink to ../root/etc. So /etc is really /root/etc.
/etc -> /home/etc -> ../root/etc/rc.d/rc.sysinit
In rc.sysint the path is set to /sbin:/bin:/usr/sbin.rom:/usr/bin.rom.
Then if the file /etc/sysconfig/network exists it is executed. And
it does.
8) /root/etc/rc.d/rc.rofilesys is run
The rc.sysinit function has found
that this is the
first time the system was booted.
Most of the root file system is empty at this point.
A fresh copy of the ____ file
system needs to be created.
These file systems are keep in:
/root/.dev_default.tar
/root/.home_default.tar
/root/.var_default.tar
The command oncheck is run. This
command determins if
the system has been cold booted.
If the system has been cold booted:
8a) /dev is created
The command:
dd if=/dev/zero of=/dev/ram1 bs=1024 count=64
carves out the memory needed (64k) for /dev
A minux file system is made in this space.
mkfs.minix -i 512 /dev/ram1 64
The file system is mounted and the default devices
are created.
mount -t minix /dev/ram1 /dev
cd /
tar xf /root/.dev_default.tar
8b) /home is created
This space is created with:
dd if=/dev/zero of=/dev/mtd1 bs=1024 count=0x00600000
NOTE: The size used here is set by ____.
This space is made into an FS2 disk disk and mounted.
Then the home and var archives are restored into
the space.
mount -t ext2 -o sync /dev/mtdblock1 /home
cd /
tar xf /root/.home_default.tar
cd /home/system
tar xf /root/.var_default.tar
8c) 'oncheck -clear' is run to
clear the cold hardware boot flag.
If the sytem has been worm booted:
8a) /dev is recreated just like
above
8b) The file system is check:
e2fsck -y -f /dev/mtdblock1
If this check goes bad an error messages printed to the
user and the file systems are unmonted and the system
is rebooted.
If the file system check goes good /home is mounted.
9) The loopback network device is setup
10) The hostname is set.
11) Module dependices are check
12) rc.modules and rc.serial are run
13) /var/lock/* and /var/run/* are removed
