快乐虾
http://blog.csdn.net/lights_joy/
本文适用于
ADI bf561 DSP
优视BF561EVB开发板
uclinux-2008r1-rc8 (移植到vdsp5)
Visual DSP++ 5.0
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在一些以模块方式提供的驱动中,使用了module_param这个宏来定义一些参数,这个宏将引起一个语法错误:
"../../drivers/net/dm9000.c", line 124: cc0020: error: identifier
"KBUILD_MODNAME" is undefined
module_param(watchdog, int, 0400);
看看module_param的定义:
#define module_param(name, type, perm) /
module_param_named(name, name, type, perm)
继续找module_param_named的定义:
/* Helper functions: type is byte, short, ushort, int, uint, long,
ulong, charp, bool or invbool, or XXX if you define param_get_XXX,
param_set_XXX and param_check_XXX. */
#define module_param_named(name, value, type, perm) /
param_check_##type(name, &(value)); /
module_param_call(name, param_set_##type, param_get_##type, &value, perm); /
__MODULE_PARM_TYPE(name, #type)
再展开module_param_call:
/* This is the fundamental function for registering boot/module
parameters. perm sets the visibility in sysfs: 000 means it's
not there, read bits mean it's readable, write bits mean it's
writable. */
#define __module_param_call(prefix, name, set, get, arg, perm) /
/* Default value instead of permissions? */ /
static int __param_perm_check_##name __attribute__((unused)) = /
BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)); /
static char __param_str_##name[] = prefix #name; /
static struct kernel_param const __param_##name /
__attribute_used__ /
__attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) /
= { __param_str_##name, perm, set, get, arg }
#define module_param_call(name, set, get, arg, perm) /
__module_param_call(MODULE_PARAM_PREFIX, name, set, get, arg, perm)
在这里使用了一个MODULE_PARAM_PREFIX的宏定义:
#define MODULE_PARAM_PREFIX KBUILD_MODNAME "."
错误提示中的KBUILD_MODNAME就出现在这里。
这个宏就是定义了模块的名称,是一个字符串,每个不同的驱动模块都有不同的名称,因此当在linux下编译时,将这个名称写在了Makefile中,因此在编译这个模块文件时,编译器会自动加上-DKBUILD_MODNAME=”xxx”这样的定义。
在VDSP下编译时,也必须为此模块文件单独定义一个KBUILD_MODNAME这个的宏。其操作为:
在文件上点右键 -> File Options -> Build with -> File specific settings -> Preprocessor -> Proprocessor definitions,添加如下定义:
KBUILD_MODNAME=/"dm9000/"
注意一定要加上反斜杠。否则将出错。
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