Difference between revisions of "Research Pre Boot Process"
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(Add some initial informations about the boot process) |
(g_composite driver is build in the kernel) |
||
| Line 31: | Line 31: | ||
/sbin/modprobe -q g_composite || true | /sbin/modprobe -q g_composite || true | ||
fi | fi | ||
| + | </pre> | ||
| + | |||
| + | Is the g_composite driver is build in the kernel the script changes the configuration of the gadget driver through a sysfs entry. | ||
| + | <pre> | ||
| + | if [[ -e /var/gadget/usbnet_enabled && -e /var/gadget/novacom_enabled ]]; then | ||
| + | echo 5 > /sys/class/usb_gadget/config_num | ||
| + | elif [ -e /var/gadget/usbnet_enabled ]; then | ||
| + | echo 5 > /sys/class/usb_gadget/config_num | ||
| + | elif [ -e /var/gadget/novacom_enabled ]; then | ||
| + | echo 2 > /sys/class/usb_gadget/config_num | ||
| + | else | ||
| + | echo 1 > /sys/class/usb_gadget/config_num | ||
| + | fi | ||
</pre> | </pre> | ||
Revision as of 15:03, 28 November 2009
General
On startup /dev/root is mounted as rootfs. Then /sbin/init is called which mounts /dev/mapper/store-root as the new rootfs. Finally the init script on /dev/root calls the init script in /sbin /dev/mapper/store-root.
The init script on /dev/mapper/store-root starts upstart or the miniboot.sh script in /etc.
Networking
When upstart is starting it executes a script called usbctrl whichs load the right usb driver and configuration for novacom or usbnetworking. Depending which machine is used the g_composite driver is loaded with a different product id.
if [[ "$machineType" == "armv7l" ]];then
if [[ -e /var/gadget/usbnet_enabled && -e /var/gadget/novacom_enabled ]]; then
/sbin/modprobe -q g_composite product=0x101 || true
elif [ -e /var/gadget/usbnet_enabled ]; then
/sbin/modprobe -q g_composite product=0x101 || true
elif [ -e /var/gadget/novacom_enabled ]; then
/sbin/modprobe -q g_composite product=0x8002 || true
else
/sbin/modprobe -q g_composite product=0x8004 || true
fi
elif [[ "$machineType" == "armv6l" ]];then
if [[ -e /var/gadget/usbnet_enabled && -e /var/gadget/novacom_enabled ]]; then
/sbin/modprobe -q g_composite product=0x103 || true
elif [ -e /var/gadget/usbnet_enabled ]; then
/sbin/modprobe -q g_composite product=0x103 || true
elif [ -e /var/gadget/novacom_enabled ]; then
/sbin/modprobe -q g_composite product=0x8012 || true
else
/sbin/modprobe -q g_composite product=0x8012 || true
fi
else
/sbin/modprobe -q g_composite || true
fi
Is the g_composite driver is build in the kernel the script changes the configuration of the gadget driver through a sysfs entry.
if [[ -e /var/gadget/usbnet_enabled && -e /var/gadget/novacom_enabled ]]; then echo 5 > /sys/class/usb_gadget/config_num elif [ -e /var/gadget/usbnet_enabled ]; then echo 5 > /sys/class/usb_gadget/config_num elif [ -e /var/gadget/novacom_enabled ]; then echo 2 > /sys/class/usb_gadget/config_num else echo 1 > /sys/class/usb_gadget/config_num fi