Technical data

4. Packages
4.11.3. Expert settings
The following settings should only be touched if you know exactly
• which hardware you have,
• which additional drivers it needs and
• the addresses and types of I
2
C
8
devices.
Activating the expert settings will issue a warning during the mkfli4l build.
HWSUPP_DRIVER_N Number of additional drivers. The drivers in HWSUPP_DRIVER_x will
be loaded in the denoted order.
HWSUPP_DRIVER_x Driver name (without file extension .ko).
Example:
HWSUPP_DRIVER_N='2'
HWSUPP_DRIVER_1='i2c-piix4' # I2C bus driver
HWSUPP_DRIVER_2='gpio-pcf857x' # I2C GPIO expander
HWSUPP_I2C_N Number of I
2
C devices to be loaded.
I
2
C doesn’t support any PnP mechanismn. Hence for each I
2
C device the bus number,
the device address and the device type have to be specified.
HWSUPP_I2C_x_BUS I
2
C bus number the device is attached to.
The bus number has to be entered as i2c-x.
HWSUPP_I2C_x_ADDRESS The device’s I
2
C address.
The address has to be entered as a hex number in the range between 0x03 and 0x77.
HWSUPP_I2C_x_DEVICE The type of I
2
C device which is supported by an already loaded
driver.
Example:
HWSUPP_I2C_N='1'
HWSUPP_I2C_1_BUS='i2c-1'
HWSUPP_I2C_1_ADDRESS='0x38'
HWSUPP_I2C_1_DEVICE='pcf8574a' # supported by gpio-pcf857x driver
4.11.4. Support for VPN cards
OPT_VPN_CARD The setting ’no’ deactivates the OPT_VPN_CARD package completely.
There will be no changes made to the fli4l boot mediums or the archive opt.img. OPT_VPN_CARD
does not overwrite any other parts of the fli4l installation. To activate OPT_VPN_CARD
set the variable OPT_VPN_CARD to ’yes’.
8
An I
2
C bus or SMBus is a serial bus used in PCs eg. to read temperature sensor values. In many cases an
I
2
C bus or SMBus is available on a pin header and can be used for own hardware extensions.
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