openwrt 15.05 branch (Chaos Calmer)编译出的固件bootargs被覆盖

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编译出的固件

bootargs参数被内核覆盖

内核不使用uboot传来的参数

查看代码发现在

内核代码\linux-3.18.27\arch\mips\ath79\prom.c中

调用prom_init => ath79_prom_init_cmdline => ath79_use_image_cmdline

进入了ath79_use_image_cmdline

在函数ath79_use_image_cmdline中使用了__image_cmdline

#ifdef CONFIG_IMAGE_CMDLINE_HACKextern char __image_cmdline[];static int __init ath79_use_image_cmdline(void){char *p = __image_cmdline;int replace = 0;if (*p == '-') {replace = 1;p++;}if (*p == '\0')return 0;if (replace) {strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline));} else {strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));}return 1;}#elsestatic inline int ath79_use_image_cmdline(void) { return 0; }#endif

__image_cmdline

在汇编文件linux-3.18.27/arch/mips/kernel/head.S中导出

#ifdef CONFIG_IMAGE_CMDLINE_HACK        .ascii  "CMDLINE:"EXPORT(__image_cmdline)        .fill   0x400#endif /* CONFIG_IMAGE_CMDLINE_HACK */

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