以下引自 PCTel 的某个自述文件。 因此，您可以通过插入带参数的模块来选择合适的国家/地区代码，如下所示：
insmod pctel.o country_code=7（将“7”替换为以下列表中的您的国家/地区代码）。感谢 Jonathan Emery 指出正确的语法。
Set and report country code.
This driver takes a module parameter to setup the correct country code
setting for various country's telephone networks and it also can report
back the country code been set.
Here are the two versions for country_code selection and reporting:
VERSION #1:
To set country code:
"country_sel_rep sel 7" will sets the country code to 7.
To query the driver for the currently set country code:
"country_sel_rep rep" returns the current country code as the exit code.
VERSION #2:
To set country code:
"country_sel 7" to set the country code to 7.
To query the driver for the currently set country code:
"country_rep" return the current country code as the exit code.
country_code country_name
1 USA
2 FRANCE
3 GERMANY
4 ITALY
5 SWEDEN
6 UK
7 JAPAN
8 AUSTRALIA
9 SPAIN
10 TAIWAN
11 SINGAPORE
12 KOREA
13 SWITZERLAND
14 NORWAY
15 NETHERLANDS
16 BELGIUM
17 CANADA
18 IRELAND
19 PORTUGAL
20 POLAND
21 HUNGARY
22 FINLAND
23 DENMARK
24 AUSTRIA
25 S.AFRICA
26 CTR21 COUNTRIES
27 CHINA
28 MALAYSIA
29 LUXUMBURG
30 GREECE
31 ICELAND
32 NEW ZEALAND
33 BRAZIL