adding-usb-driver.md

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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 or your preferred update mechanism.

After launching, you need to run the commands modprobe sd_mod and modprobe scsi_mod