zImage works, but not vmlinux

[f. achkar]

On 05/25/2010 01:12 PM, Kristoffer Ericson wrote:
> On Tue, May 25, 2010 at 01:07:27PM -0400, f. achkar wrote:
>   
>> On 05/25/2010 12:54 PM, Kristoffer Ericson wrote:
>>     
>>> On Tue, May 25, 2010 at 11:43:17AM -0400, f. achkar wrote:
>>>   
>>>       
>>>> Hi,
>>>> I have tried to send this message some part of it was ignored, resending
>>>> sorry ...
>>>>
>>>> greetings,
>>>> I'm newbie to arm linux, so pls if my issue is already addressed just
>>>> point me to that reference. I'm trying to learn, but couldn't pass the
>>>> following stage:
>>>> I have a s3c245 based board, I have a working compressed kernel image
>>>> zImage, this image boots properly via u-boot-1.1.6, however I simply
>>>> failed to load (i.e., boot vmlinux) via u-boot directly from SDRAM.
>>>>
>>>> more details:
>>>>
>>>>    1. I let the target boot until the message of "  Hit any key to stop
>>>>       autoboot: " for which I hit enter, (this initialized the board
>>>>       enables MMU, I-Cache, .. etc);
>>>>    2. board info as seen by u-boot
>>>>       # bdinfo
>>>>       arch_number = 0x00000648
>>>>       env_t       = 0x00000000
>>>>       boot_params = 0x30000100
>>>>       DRAM bank   = 0x00000000
>>>>       -> start    = 0x30000000
>>>>       -> size     = 0x04000000
>>>>       DRAM bank   = 0x00000001
>>>>       -> start    = 0x38000000
>>>>       -> size     = 0x04000000
>>>>       ethaddr     = ...:5B
>>>>       ip_addr     = ...200
>>>>       baudrate    = 115200 bps
>>>>    3. laod vmlinux to SDRAM :
>>>>       tftp 30008000 vmlinux
>>>>       TFTP from server ...210; our IP address is ...200
>>>>       Filename 'vmlinux'.
>>>>       Load address: 0x30008000
>>>>       Loading: T ############ .....
>>>>    4. # bootm 30008000
>>>>       ## Booting image at 30008000 ...
>>>>       Boot with Image
>>>>       do not support this address : 30008000
>>>>
>>>>       Starting kernel ...
>>>>     
>>>>         
>>> Is that kernel compiled with early printk? 
>>>   
>>>       
>> the kernel version is 2.6.21-1, and there is no early_printk support yet
>> for that version!
>> thanks
>>     
> Then you should add some ascii_printk output so you get more info.
> I believe its described on arm wiki.
>   
thanks for your approach ... pls read on:
I have j-link jtag connected to the target board I can successfully
debug via openocd + gdb various assembly codes that controls &
configures the target hardware, however when I try the same with the
vmlinux (root directory of linux source ) things don't go as expected!
I can stepi thought the initial code of the stext
(arch/arm/kernel/head.S) as per
http://www.linux-arm.org/LinuxBootLoader/SMPBoot

however when I reach :
smp_setup_processor_id();  in main.c: kernel_start , If I do in gdb
next, the control never returns to gdb, also I don't see any output on
the serial console!

that's why I have asked on how to boot or launch that same vmlinux which
I am trying to debug from within u-boot command prompt, and which simply
as mentioned hangs immediately.
To make things clear : I'm trying to LEARN how to debug remotely via
openocd (jtag) + gdb the linux kernel on an arm926ejs based target. Note
that zImage is working just fine for the same source tree of vmlinux.
thanks
ferar

>
>   
>>>   
>>>       
>>>> and nothing happens it probably crashed somewhere, why zImage works
>>>> while vmlinux does not?
>>>> thanks,
>>>> ferar
>>>>
>>>>
>>>> _______________________________________________
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>>>>     
>>>>