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Re: MIPS kernel hangs: Warning: unable to open an initial console. /sbin

To: "J. Scott Kasten" <jscottkasten@yahoo.com>
Subject: Re: MIPS kernel hangs: Warning: unable to open an initial console. /sbin/init
From: "Jon Fraser" <jfraser@broadcom.com>
Date: Thu, 15 May 2008 10:25:00 -0400
Cc: abhiruchi.g@vaultinfo.com, "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>
In-reply-to: <Pine.LNX.4.64.0805150937380.13041@pixie.tetracon-eng.net>
Organization: Broadcom
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <55815.192.168.1.71.1210856139.webmail@192.168.1.71> <Pine.LNX.4.64.0805150937380.13041@pixie.tetracon-eng.net>
Reply-to: jfraser@broadcom.com
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Actually, the kernel knows where the console is, or you wouldn't
get any printk's.  Is /dev in your rootfs populated? Is there
a /dev/console?

Jon



On Thu, 2008-05-15 at 09:41 -0400, J. Scott Kasten wrote:
> The linux-mips list is the right place for this question.
> 
> [1] Do you have serial console or other appropriate device enabled in the 
> build for your board?
> 
> [2] In the arch specific init code, did you specify the default console 
> device in the code?
> 
> [3] Did you set the console on the kernel command line?
> 
> This sounds like a simple oversight somewhere.  The kernel is very unhappy 
> without the console.
> 
> -S-
> 
> On Thu, 15 May 2008, abhiruchi.g@vaultinfo.com wrote:
> 
> > Hi,
> >
> > My kernel hangs by initializing the system. My target is Alchemy DB1200. I 
> > use crosstool-ng to build MIPS cross toolchain and ptxdist to build ext2 
> > filesystem.
> > kernel version:linux-2.6.22
> >
> >
> > I added some printk's  linux/init/main.c to see what happens.
> >
> > #############################################################
> >
> >     .
> >     .
> >     .
> >     (void) dup(0);
> >     (void) dup(0);
> >
> >     /*
> >      * We try each of these until one succeeds.
> >      *
> >      * The Bourne shell can be used instead of init if we are
> >      * trying to recover a really broken machine.
> >      */
> >     if (execute_command)
> >             run_init_process(execute_command);
> >     printk("before /sbin/init\n");
> >     run_init_process("/sbin/init");
> >     printk("before /etc/init\n");
> >     run_init_process("/etc/init");
> >     printk("before  /bin/init\n");
> >     run_init_process("/bin/init");
> >     printk("before  /bin/sh\n");
> >     run_init_process("/bin/sh");
> >
> > it hangs after /sbin/init
> >
> > What could be the problem?
> >
> > I tried to give init="/sbin/abhi"
> > "abhi" is an executable file with printf statement.
> > but kernel stops after :
> >
> >
> > Waiting 10sec before mounting root device...
> > scsi 0:0:0:0: Direct-Access     Ut163    USB2FlashStorage 0.00 PQ: 0 ANSI: 2
> > sd 0:0:0:0: [sda] 983808 512-byte hardware sectors (504 MB)
> > sd 0:0:0:0: [sda] Write Protect is off
> > sd 0:0:0:0: [sda] Assuming drive cache: write through
> > sd 0:0:0:0: [sda] 983808 512-byte hardware sectors (504 MB)
> > sd 0:0:0:0: [sda] Write Protect is off
> > sd 0:0:0:0: [sda] Assuming drive cache: write through
> > sda:<7>usb-storage: queuecommand called
> > sda1
> > sd 0:0:0:0: [sda] Attached SCSI removable disk
> > sd 0:0:0:0: Attached scsi generic sg0 type 0
> > VFS: Mounted root (ext2 filesystem) readonly.
> > mount_block_root: name=/dev/root fs=ext2 flags=32769
> > Freeing unused kernel memory: 156k freed
> > Warning: unable to open an initial console.
> > ---ag: /sbin/abhi
> >
> >
> >
> >
> 
> 
> 



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