When installing the Dahdi module, the following error occurs: insmod: can & amp; #39; t insert & amp; #39; dahdi. ko & amp; #39;: unknown symbol in module or invalid parameter.

When the Dahdi module is installed, the following error occurs: insmod: can & #39; t insert & #39; dahdi. ko & #39;: unknown symbol in module or invalid parameter.

Dahdi source code downloaded from Digitum official website. After compilation, an error occurs when dadhi is installed:

# Insmod dahdi. ko

Dahdi: Unknown symbol crc_ccitt_table

Insmod: can't insert 'dahdi. ko ': unknown symbol in module or invalid parameter

Find the reason...

Check whether the kernel symbol exists in the virtual machine.

# Cat/proc/kallsyms | grep "crc_ccitt"
F8caa260 r _ ksymtab_crc_ccitt [crc_ccitt]
F8caa278 r _ kstrtab_crc_ccitt [crc_ccitt]
F8caa270 r _ kcrctab_crc_ccitt [crc_ccitt]
F8caa268 r _ ksymtab_crc_ccitt_table [crc_ccitt]
F8caa282 r _ kstrtab_crc_ccitt_table [crc_ccitt]
F8caa274 r _ kcrctab_crc_ccitt_table [crc_ccitt]
F8caa292 r _ rheldata [crc_ccitt]
F8caa2a0 d _ this_module [crc_ccitt]
F8caa000 T crc_ccitt [crc_ccitt]
This module is available under the virtual machine. Then proceed to the search:

# Modinfo crc_ccitt
Filename:/lib/modules/2.6.32-220. el6.i686/kernel/lib/crc-ccitt.ko
License: GPL
Description: CRC-CCITT calculations
Srcversion: 2294fcad06d727213004eeb
Depends:
Vermagic: 2.6.32-220. el6.i686 SMP mod_unload modversions 686

The original crc_ccitt kernel symbol is in/lib/modules/2.6.32-220. el6.i686/kernel/lib/crc-ccitt.ko.

By default, the Linux kernel source code is not compiled into the kernel but in the module form.

# Make menuconfig

---> Library routines

---> CRC_CCITT funcitons

Select and compile the program to the kernel or set it as a module.

Copy this module to the Development Board, install it first, and then install dahdi. ko.

# Insmod crc-ccitt.ko

# Insmod dahdi. ko