Share your knowledge at the LQ Wiki.
Go Back > Forums > Linux Forums > Linux - Newbie
User Name
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!


  Search this Thread
Old 03-07-2013, 11:50 PM   #1
Registered: Mar 2013
Posts: 65

Rep: Reputation: Disabled
Booting problem at time of kernel booting

1. I am trying to setup the development environment for an New Board that contains (LPC3250) ARM9 controller,SDRAM(MT48LC32M16A2P) with memory size of 512Mbits and NAND FLASH.when I tried to cross-compile the kernel and load it on the board(in NAND FLASH),the console showing the message

Uncompressing Linux... done, booting the kernel
2.I thought that may be a problem in SDRAM configuration or,i have changed the settings of SDRAM in dramconfig.h file.

Then also it is showing the same problem.
After that i follow the below steps
A. Enabling Kernel Low Level Debugging ( CONFIG_DEBUG_LL )

1. In menuconfig search for 'Kernel Low Level Debugging'. ( To search in menuconfig: after make ARCH=.. CROSS_COMPILE=... menuconfig, press '/' sign.
A dialouge box will appear. Type the string to be searched and press enter.)

2. This will show where the low level debugging option is and by what name will it be represented. Note down the path and also check all the dependencies.

3. Press EXIT. Select all the dependencies and the low level debugging option.

4. Save the configuration and exit.

Do not build the kernel Image (uImage) yet.

B. Using early printks:

1. In your kernel source open kernel/printk.c using vim editor ( or any editor you prefer ). Add 'printascii' to the function vprintk in the following manner:

extern void printascii(const char*);

asmlinkage int vprintk(const char *fmt, va_list args)
int printed_len = 0;
int current_log_level = default_message_loglevel;
unsigned long flags;
int this_cpu;
char *p;


/* Emit the output into the temporary buffer */
printed_len += vscnprintf(printk_buf + printed_len,
sizeof(printk_buf) - printed_len, fmt, args);


* Copy the output into log_buf. If the caller didn't provide
* appropriate log level tags, we insert them here
for (p = printk_buf; *p; p++) {
if (new_text_line) {
/* If a token, set current_log_level and skip over */
if (p[0] == '<' && p[1] >= '0' && p[1] <= '7' &&
p[2] == '>') {
current_log_level = p[1] - '0';
p += 3;
printed_len -= 3;

2. Save the file and exit. ( in vim press 'Esc' and the ':wq' and then 'Enter' to save and exit. )

3. Now build the kernel image. ( uImage )

4. On the u-boot prompt give the following command:

$ setenv bootargs $(bootargs) earlyprintk=serial

or simple add 'earlyprintk=serial' to the bootargs.

C. Save if desired and boot with the uImage formed above. You will get the prints even if the console is not initialized.
Then the console has displayed the message

Uncompressing Linux... done, booting the kernel.
<5>Linux version 2.6.34 (root@biyabani) (gcc version 4.2.2) #5 PREEMPT Wed Feb 3
CPU: ARM926EJ-S [41069264] revision 4 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: Future Designs board with the LPC3250 Microcontroller
Memory policy: ECC disabled, Data cache writeback
<7>On node 0 totalpages: 8192
<7>free_area_init_node: node 0, pgdat c0373fa0, node_mem_map c0393000
<7> Normal zone: 64 pages used for memmap
<7> Normal zone: 0 pages reserved
<7> Normal zone: 8128 pages, LIFO batch:0
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 8128
<5>Kernel command line: console=ttyTX0,115200n8 root=/dev/ram0 rw ip=
<6>PID hash table entries: 128 (order: -3, 512 bytes)
<6>Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
<6>Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
<6>Memory: 32MB = 32MB total
<5>Memory: 27188k/27188k available, 5580k reserved, 0K highmem
<5>Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
vmalloc : 0xc2800000 - 0xf0000000 ( 728 MB)
lowmem : 0xc0000000 - 0xc2000000 ( 32 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.init : 0xc0008000 - 0xc0027000 ( 124 kB)
.text : 0xc0027000 - 0xc0358000 (3268 kB)
.data : 0xc0358000 - 0xc03745a0 ( 114 kB)
<6>Hierarchical RCU implementation.
Console: colour dummy device 80x30
<6>Calibrating delay loop... 133.12 BogoMIPS (lpj=665600)
Mount-cache hash table entries: 512
<6>CPU: Testing write buffer coherency: ok
<6>NET: Registered protocol family 16
I did not understood anything from above message...
please if anybody know what is the problem then post it.
thank you

Last edited by colucix; 03-10-2013 at 03:47 AM. Reason: Added CODE tags to improve readability
Old 03-07-2013, 11:51 PM   #2
Registered: Mar 2013
Posts: 65

Original Poster
Rep: Reputation: Disabled
How to find out kernel base address

I am trying to setup the development environment for an New Board that contains (LPC3250) ARM9 controller,SDRAM (MT48LC32M16A2P) with memory size of 512Mbits and NAND FLASH.when I tried to cross-compile the kernel and load it on the board(in NAND FLASH),the console showing the message

Uncompressing Linux... done, booting the kernel
To identify what is the problem i need kernel base address, i tried to found the address but i did not got it. So, I want to know which file contains kernel base address?

Thanks & Regards.
Old 03-08-2013, 11:10 AM   #3
Senior Member
Registered: Dec 2012
Location: Washington DC area
Distribution: Fedora, CentOS, Slackware
Posts: 3,545

Rep: Reputation: 884Reputation: 884Reputation: 884Reputation: 884Reputation: 884Reputation: 884Reputation: 884
None of them.

It is determined at boot time. The kernel moves depending on the amount of memory provided. Once the mapping tables are set, the actual physical address is a don't care. BTW, a 512 Mbit memory is only 64Mbyte. Rather small for most operations.

I would first suggest booting without custom drivers to see how the base system functions.

I would expect the boot code to tell you where things are when the kernel gets loaded (it should say something about "relocating kernel...".
Old 03-09-2013, 07:36 PM   #4
LQ 5k Club
Registered: Aug 2005
Distribution: OpenSuse, Fedora, Redhat, Debian
Posts: 5,396
Blog Entries: 2

Rep: Reputation: 906Reputation: 906Reputation: 906Reputation: 906Reputation: 906Reputation: 906Reputation: 906Reputation: 906
So, what did you expect to happen?
The kernel seems to be loading and running. I think you should focus on the userspace level. What are you using for a root filesystem, and what kernel arguments have been given to specify the init process, the root filesystem, etc?
--- rod.
Old 03-10-2013, 03:50 AM   #5
Registered: Sep 2003
Location: Bologna
Distribution: CentOS 6.5 OpenSuSE 12.3
Posts: 10,509

Rep: Reputation: 1966Reputation: 1966Reputation: 1966Reputation: 1966Reputation: 1966Reputation: 1966Reputation: 1966Reputation: 1966Reputation: 1966Reputation: 1966Reputation: 1966
Moderator note: two strictly related threads and the related answer have been merged here.


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
kernel displays time when booting jong357 Slackware 2 11-01-2008 01:09 PM
problem in booting lfs even for the very first time sureka Linux From Scratch 3 05-21-2008 02:42 PM
dual booting / time problem cuk Slackware 6 01-18-2008 09:21 PM
Ntp time syncing problem when booting shan_nathan Linux - Desktop 1 11-23-2007 08:51 AM
booting new kernel. Booting new kernel dies with INIT: VFS issue, really mus335 Linux - General 0 04-21-2004 12:52 PM

All times are GMT -5. The time now is 03:57 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration