Re: Problem with init call

[Wan ZongShun <mcuos.com@xxxxxxxxx>]

Can you find this console file in rootfs/dev/? Sure the UART driver workswell?
There are a lot of reasons for this Warning！2009/3/17 Zachár Balázs <bzachar@xxxxxxxxxxxxxx>
> Hi,>> I have a pxa270 based board, and I would like to renew the system on it...>> I am using the emdebian's stable gnueabi cross-toolchain.> I have already recompile the kernel (both latest stable (2.6.28.7) and> testing (2.6.29-rc8)) and it works (boot up) now...> I make a single init code:> devel:/opt/rootfs# cat test_init.c> #include <stdio.h>>> int main()> {>  printf("Hello world!\n");>  while(1);>  return 0;> }>> I compiled it with the toolchain to static and move it to the> ${nfsserver}/root/sbin/init place>> But when I got this error message when I trying to boot:>> Looking up port of RPC 100003/2 on 10.10.10.1> Looking up port of RPC 100005/1 on 10.10.10.1> VFS: Mounted root (nfs filesystem) on device 0:11.> Freeing init memory: 96K> Warning: unable to open an initial console.> Kernel panic - not syncing: Attempted to kill init!>>> (I have console= in the kernel params so I ignore the warning message...)> I put some printk to the arch/arm/kernel/sys_arm.c's kernel_execve function> to see where is the problem:> int kernel_execve(const char *filename, char *const argv[], char *const> envp[])> {>        struct pt_regs regs;>        int ret;>>        printk("Before memset.\n");>        memset(&regs, 0, sizeof(struct pt_regs));>        printk("After memset, before do_execve.\n");>        ret = do_execve((char *)filename, (char __user * __user *)argv,>                        (char __user * __user *)envp, &regs);>        printk("After do_execve, return value: %d\n",ret);>        if (ret < 0)>                goto out;>        /*>         * Save argc to the register structure for userspace.>         */>        regs.ARM_r0 = ret;>>        /*>         * We were successful.  We won't be returning to our caller, but>         * instead to user space by manipulating the kernel stack.>         */>        printk("Before asm code.\n");>        asm(<-->"add<-->r0, %0, %1\n\t">                "mov<-->r1, %2\n\t">                "mov<-->r2, %3\n\t">                "bl<--->memmove\n\t"<-->/* copy regs to top of stack */>                "mov<-->r8, #0\n\t"<--->/* not a syscall */>                "mov<-->r9, %0\n\t"<--->/* thread structure */>                "mov<-->sp, r0\n\t"<--->/* reposition stack pointer */>                "b<---->ret_to_user">                :>                : "r" (current_thread_info()),>                  "Ir" (THREAD_START_SP - sizeof(regs)),>                  "r" (&regs),>                  "Ir" (sizeof(regs))>                : "r0", "r1", "r2", "r3", "ip", "lr", "memory");>        printk("After asm code.\n");>  out:>        return ret;> }>>> And I got this output at boot:> Freeing init memory: 96K> Warning: unable to open an initial console.> Before memset.> After memset, before do_execve.> After do_execve, return value: 0> Before asm code.> Kernel panic - not syncing: Attempted to kill init!>>>> It looks like when it use the asm code, it crash (no "After asm code."> message)...>> Any Idea what am I doing wrong?>> regards,> Balázs Zachár>>>>>>>>>>>> -------------------------------------------------------------------> List admin: http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm> FAQ:        http://www.arm.linux.org.uk/mailinglists/faq.php> Etiquette:  http://www.arm.linux.org.uk/mailinglists/etiquette.php>


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