LinuxPPC-Dev Archive on lore.kernel.org

* Re: Linux on ML403 serial console problem
From: John Bonesio @ 2008-07-03 21:43 UTC (permalink / raw)
  To: Anand Kumar S; +Cc: linuxppc-embedded
In-Reply-To: <66E8AEE9980BB44CA5FCAD39EBA56AC604A5F1DF@CHN-HCLT-EVS02.HCLT.CORP.HCL.IN>

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Hi,

I don't have a clear idea about this, but it seems to me that there's
probably something in your root filesystem that is causing output to be
directed to a different console that the serial console. Maybe it's
using the wrong getty program.

- John

On Thu, 2008-07-03 at 15:42 +0530, Anand Kumar S wrote:
> Hi,
> 
>  
> 
> I am using MVL 4.0.1 to boot on ML403 board. I have created the
> xparameters.h file using EDK 10.1 and I was able to boot the kernel
> with 32 MB of memory and UART set as std 16550 uart.
> 
> Since this board came without sysace flash card I am using ramdisk
> technique to boot linux. I created a small ramdisk with my test
> program which sleeps for 10 seconds and prints a hello
> 
> world using printf. I modified kernel init/main.c to execute /bin/test
> (my test program) from the RAMDISK. I created the ramdisk and appended
> with zImage using make zImage.initrd command
> 
>  
> 
> I used dow method from xmd to download the zImage.initrd.elf on the
> board and I was able to boot the board till the point of executing
> my /bin/test. However I see that the print statements
> 
> from my test program are not coming on the serial port. I see that the
> printf calls tty_io write and it goes to uart_write routine in
> serial_core.c, however I am not able to see my prints on
> 
> the hyperterminal. I can see all the kernel printks except for this
> printf statement from my user program. Also all the kernel printks
> seem to call serial_8250_console write routine but the
>
> user application seems to call the uart_write routine. Does someone
> have any idea about what might be going wrong here? Is it something to
> do with serial console settings ?
> 
>  
> 
> Any help is greatly appreciated as I am really struggling with this
> problem for the past 3 days. Given below is the output from serial
> port. I do not have FB support or VT or VT console
> 
> Support enabled. Only SERIAL console support is enabled i.e
> SERIAL_CORE_CONSOLE/SERIAL_8250_CONSOLE support is enabled
> 
>  
> 
> …..
> 
> …..
> 
> Serial: 8250/16550 driver $Revision: 1.90 $ 5 ports, IRQ sharing
> disabled
> 
> Registering platform device 'serial8250'. Parent at platform
> 
> ttyS0 at MMIO 0x0 (irq = 9) is a 16550A
> 
> io scheduler noop registered
> 
> io scheduler anticipatory registered
> 
> io scheduler deadline registered
> 
> io scheduler cfq registered
> 
> RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize
> 
> loop: loaded (max 8 devices)
> 
> PPP generic driver version 2.4.2
> 
> PPP Deflate Compression module registered
> 
> NET: Registered protocol family 24
> 
> xemac 0: using fifo mode.
> 
> eth0: Xilinx EMAC #0 at 81000000 mapped to 0xC30C0000, irq=0
> 
> i2c /dev entries driver
> 
> xilinx_iic.0 #0 at 0x81600000 mapped to 0xC30E0000, irq=6
> 
> mice: PS/2 mouse device common for all mice
> 
> NET: Registered protocol family 2
> 
> IP: routing cache hash table of 512 buckets, 4Kbytes
> 
> TCP: Hash tables configured (established 2048 bind 4096)
> 
> NET: Registered protocol family 1
> 
> NET: Registered protocol family 17
> 
> interrupts enabled 
> 
> TX interrupts enabled. register baseaddr c30c0000 offset 7fc is 8 
> 
> TX interrupts enabled. register baseaddr c30c0000 offset ffc is 0 
> 
> RX interrupts enabled. register baseaddr c30c0000 offset 17fc is 9 
> 
> RX interrupts enabled. register baseaddr c30c0000 offset 1ffc is 0 
> 
> GIER interrupts enabled. register baseaddr c30c0000 offset 7f8 is
> 80000000 
> 
> Sending DHCP requests .,... OK
> 
> IP-Config: Got DHCP answer from 0.0.0.0, my address is 10.100.12.132
> 
> IP-Config: Complete:
> 
>       device=eth0, addr=10.100.12.132, mask=255.255.255.0,
> gw=10.100.12.1,
> 
>      host=10.100.12.132, domain=hclt.corp.hcl.in, nis-domain=(none),
> 
>      bootserver=0.0.0.0, rootserver=0.0.0.0, rootpath=
> 
> RAMDISK: Compressed image found at block 0
> 
> VFS: Mounted root (ext2 filesystem).
> 
> Freeing unused kernel memory: 124k init
> 
> done freeing memory. creating console 
> 
> console created 
> 
> running process /bin/test 
> 
> in tty_write
> 
> before calling write. buf contents h e l
> 
> core write
> 
> core write
> 
> core write
> 
> Kernel panic - not syncing: Attempted to kill init!
> 
>  <0>Rebooting in 180 seconds..<NULL>
> 
>  
> 
> 
> 
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________________________________________________________________________

John Bonesio
Commercial Linux Solutions
john.bonesio@xilinx.com
(408) 879-5569

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