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dmesg prints or controls the kernel ring buffer. It can be made avalible via:

  • or as a standalone application


If you have not cleared the the kernel ring buffer, it will look something like this shortly after boot:

root:~> dmesg
Linux version (rgetz@home) (gcc version 3.4.5 (ADI cvs)) #30 Mon Sep 4 00:12:18 EDT 2006
Blackfin support (C) 2004-2006 Analog Devices, Inc.
Compiled for ADSP-BF537 Rev. 0.2
Blackfin uClinux support by
Processor Speed: 500 MHz core clock and 100 Mhz System Clock
Board Memory: 64MB
Kernel Managed Memory: 64MB
Memory map:
  text      = 0x00001000-0x0010464c
  init      = 0x00105000-0x001124d4
  data      = 0x00112768-0x00143cdc
  stack     = 0x00114000-0x00116000
  bss       = 0x00143ce0-0x00151884
  available = 0x00151884-0x03700000
  rootfs    = 0x03700000-0x03f00000
  DMA Zone  = 0x03f00000-0x04000000
On node 0 totalpages: 14080
  DMA zone: 14080 pages, LIFO batch:3
  DMA32 zone: 0 pages, LIFO batch:0
  Normal zone: 0 pages, LIFO batch:0
  HighMem zone: 0 pages, LIFO batch:0
Instruction Cache Enabled
Data Cache Enabled (write-through)
Hardware Trace Enabled
Built 1 zonelists
Kernel command line: root/dev/mtdblock0 rw panic=3
Configuring Blackfin Priority Driven Interrupts
PID hash table entries: 256 (order: 8, 4096 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Physical pages: 3700
Memory available: 54400k/64438k RAM, (53k init code, 1037k kernel code, 54k data, 1024k dma)
Blackfin Scratchpad data SRAM: 4 KB
Blackfin DATA_A SRAM: 16 KB
Blackfin DATA_B SRAM: 16 KB
Blackfin Instruction SRAM: 48 KB
Calibrating delay loop... 995.32 BogoMIPS (lpj=1990656)
Security Framework v1.0.0 initialized
Capability LSM initialized
Mount-cache hash table entries: 512
NET: Registered protocol family 16
Blackfin DMA Controller
stamp_init(): registering device resources
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler cfq registered
Real Time Clock Driver v1.10e
Blackfin BF5xx serial driver version 2.00 (DMA mode)
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Blackfin mac net device registered
uclinux[mtd]: RAM probe address=0x3700000 size=0x800000
Creating 1 MTD partitions on "RAM":
0x00000000-0x00800000 : "ROMfs"
uclinux[mtd]: set ROMfs:EXT2  to be root filesystem
NET: Registered protocol family 2
IP route cache hash table entries: 512 (order: -1, 2048 bytes)
TCP established hash table entries: 2048 (order: 1, 8192 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 52k freed (0x105000 - 0x111000)
ttyS0 at irq = 18 is a builtin Blackfin UART
dma_alloc_init: dma_page @ 0x0010d000 - 256 pages at 0x03f00000
No CPLB Address Match

It is a copy of everything that the kernel has output with printk.