uclinux在44b0上移植的坎坷

 uclinux在44b0上移植的坎坷。本来这块44b0的开发板n久没用了，近来拿来玩，根据文档移植发现只能启动到

Starting   kernel ...                                                                                                      

Uncompressing Linux............................ done, booting the kernel.然后就挂在这里不动了，用点灯的方法去跟发现在函数setup_architecture(machine_arch_type);的

for (list = &__arch_info_begin; list < &__arch_info_end; list++)

        {

                if (list->nr == nr)

                        break;

        }

        /*

         * If the architecture type is not recognised, then we

         * can do nothing...

         */

        if (list >= &__arch_info_end) {

                printk("Architecture configuration botched (nr %d), unable "

                       "to continue.\n", nr);

//永远停在这里了

                while (1);

        }

原因明显是在for循环那里没有找到匹配的machine_arch_type。这里的实参machine_arch_type是在arch/armnommu/tools/mach-types定义的。而结构指针list在arch/armnommu/mach-S3C44B0X/arch.c里赋值的。

#define MACHINE_START(_type,_name)              \

const struct machine_desc __mach_desc_##_type   \

 __attribute__((__section__(".arch.info"))) = { \

        nr:             MACH_TYPE_##_type,      \

        name:           _name,

然后通过链接脚本arch/armnommu/vmlinux-armv.lds.in确定__arch_info_begin的地址，

. = TEXTADDR;

        .init : {                       /* Init code and data           */

                _stext = .;

                __init_begin = .;

                        *(.text.init)

                __proc_info_begin = .;

                        *(.proc.info)

                __proc_info_end = .;

                __arch_info_begin = .;

                        *(.arch.info)

                __arch_info_end = .;

                __tagtable_begin = .;

                        *(.taglist)

                __tagtable_end = .;

                        *(.data.init)

                . = ALIGN(16);

                __setup_start = .;

                        *(.setup.init)

                __setup_end = .;

                __initcall_start = .;

                        *(.initcall.init)

                __initcall_end = .;

                . = ALIGN(4096);

                __init_end = .;

        }

移植uclinux一篇绝好的文章《uClinux porting HOWTO》，出处 http://www.arpith.com/index.php?p=12&more=1&page=3