Create adding-usb-driver.md

adding-usb-driver.md

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+# OpenIPC Wiki
+[Table of Content](../README.md)
+
+Adding usb driver to your firmware
+---
+Since most cameras have very little flash memory, OpenIPC firmware images don't contain many drivers, as they can easily be 1.5MB+ per driver.
+This means that in many cases, you will have to add the usb driver to your firmware image.
+
+### Step 1: preparing the build environment
+You will need a Linux environment. First download the OpenIPC firmware repository:
+
+```
+git clone https://github.com/OpenIPC/firmware.git openipc-firmware
+cd openipc-firmware
+```
+
+Install packages required for building:
+
+```
+sudo make deps
+```
+
+### Step 2: determine the driver package
+For example, I want to add USB support for sigmastar335 - this is "path to your folder"/openipc-firmware/br-ext-chip-sigmastar/board/infinity6b0/
+
+ 
+
+#### open configuration file:
+```
+infinity6b0-ssc009a.config
+```
+
+#### look for the lines:
+```
+#
+# also be needed; see USB_STORAGE Help for more info
+#
+```
+
+#### add a line
+```
+CONFIG_USB_STORAGE=m
+```
+
+#### look for the lines:
+```
+#
+# SCSI device support
+#
+CONFIG_SCSI_MOD=y
+```
+
+#### add a line 
+```
+CONFIG_SCSI_MOD=m
+CONFIG_CD_MOD=m
+```
+#### look for the lines:
+```
+# CONFIG_RAID_ATTRS is not set
+CONFIG_SCSI=y
+```
+
+#### add a line 
+```
+CONFIG_SCSI=m
+```
+
+#### Build your firmware
+Return to the root directory of the openipc firmware directory `openipc-firmware/`.
+Run `make` and select the configuration you have edited in the previous step.
+
+Alternatively, you can run `make BOARD=<your_config>`, where `<your_config>` is the name of the config file you have just edited, minus the `_defconfig`
+
+Example: you want to build `lite` for `ssc335`:
+```
+make BOARD=ssc335_lite
+```
+When the build is complete, you will find the output in the `output/images/` directory:
+
+```
+./rootfs.ssc335_lite.cpio
+./openipc.ssc335-nor-lite.tgz
+./rootfs.squashfs.ssc335
+./rootfs.ssc335.tar
+./uImage.ssc335
+```
+
+You can now use `rootfs.squashfs.*` and `uImage.*` with [sysupgrade](./sysupgrade.md) or your preferred update mechanism.
+
+After launching, you need to run the commands `modprobe sd_mod` and `modprobe scsi_mod`
+