[ELDK] Problem with ramdisk

[Ashok Kumar Kacham]

Hi all,

 We are porting linux on MPC8540 based custom board, some problem is coming with ramdisk,
since we got only 8MB of SDRAM on the board, we couldn't use the uRamdisk that has come with
the ELDK, when using it kernel panic is coming with the "out of memory and no killable process"
error. So i made a ramdisk by compiling busybox and copied to flash with out compressing it.
when using this ramdisk the kernel is hanging with "Machine check in kernel mode"
pls go thru the following log and help us in this issue.


U-Boot 1.3.1 (Jul  9 2009 - 10:37:35)

CPU:   8540, Version: 2.0, (0x80300020)
Core:  E500, Version: 2.0, (0x80200020)
Clock Configuration:
       CPU: 660 MHz, CCB: 264 MHz,
       DDR: 132 MHz, LBC:  33 MHz
L1:    D-cache 32 kB enabled
       I-cache 32 kB enabled
Board: ADS
    PCI1: disabled
I2C:   ready
DRAM:  Initializing
    SDRAM:  8 MB
    DDR:  8 MB
FLASH:  8 MB
L2 cache 256KB: enabled
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   TSEC0, TSEC1, FEC
=>
=> setenv bootargs console=ttyS0,115200 root=/dev/ram rw
=> bootm 0xff800000 0xffe00000 0xffd80000
## Booting image at ff800000 ...
   Image Name:   Linux-2.6.19.2
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    682153 Bytes = 666.2 kB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
## Loading RAMDisk Image at ffe00000 ...
   Image Name:   Ramdisk image
   Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
   Data Size:    1048576 Bytes =  1 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Booting using the fdt at 0xffd80000
   Loading Ramdisk to 006ad000, end 007ad000 ... OK
   Loading Device Tree to 007aa000, end 007ab226 ... OK
Using MPC85xx ADS machine description
Memory CAM mapping: CAM0=4Mb, CAM1=4Mb, CAM2=0Mb residual: 0Mb
Linux version 2.6.19.2 (root at ecstest.crl.com) (gcc version 4.0.0 (DENX ELDK
4.1 4.0.0)) #1 Tue Jul 14 09:33:31 IST 2009
Found initrd at 0xc06ad000:0xc07ad000
setup_arch: bootmem
mpc85xx_ads_setup_arch()
arch: exit
Zone PFN ranges:
  DMA             0 ->     2048
  Normal       2048 ->     2048
early_node_map[1] active PFN ranges
    0:        0 ->     2048
Built 1 zonelists.  Total pages: 2032
Kernel command line: console=ttyS0,115200 root=/dev/ram rw
mpic: Setting up MPIC " OpenPIC  " version 1.2 at e0040000, max 1 CPUs
mpic: ISU size: 4, shift: 2, mask: 3
mpic: Initializing for 60 sources
PID hash table entries: 32 (order: 5, 128 bytes)

Using MPC85xx ADS machine description
Memory CAM mapping: CAM0=4Mb, CAM1=4Mb, CAM2=0Mb residual: 0Mb
Linux version 2.6.19.2 (root at ecstest.crl.com) (gcc version 4.0.0 (DENX ELDK
4.1 4.0.0)) #1 Tue Jul 14 09:33:31 IST 2009
Found initrd at 0xc06ad000:0xc07ad000
Zone PFN ranges:
  DMA             0 ->     2048
  Normal       2048 ->     2048
early_node_map[1] active PFN ranges
    0:        0 ->     2048
Built 1 zonelists.  Total pages: 2032
Kernel command line: console=ttyS0,115200 root=/dev/ram rw
mpic: Setting up MPIC " OpenPIC  " version 1.2 at e0040000, max 1 CPUs
mpic: ISU size: 4, shift: 2, mask: 3
mpic: Initializing for 60 sources
PID hash table entries: 32 (order: 5, 128 bytes)
Dentry cache hash table entries: 1024 (order: 0, 4096 bytes)
Inode-cache hash table entries: 512 (order: -1, 2048 bytes)
Memory: 5600k/8192k available (1236k kernel code, 2592k reserved, 120k data,
71k bss, 92k init)
Mount-cache hash table entries: 512
checking if image is initramfs...it isn't (bad gzip magic numbers); looks like
an initrd
Freeing initrd memory: 1024k freed
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
Generic RTC Driver v1.07
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled
serial8250.0: ttyS0 at MMIO 0xe0004500 (irq = 0) is a 16550A
serial8250.0: ttyS1 at MMIO 0xe0004600 (irq = 0) is a 16550A
RAMDISK driver initialized: 16 RAM disks of 32768K size 1024 blocksize
loop: loaded (max 8 devices)
RAMDISK: ext2 filesystem found at block 0
RAMDISK: Loading 1024KiB [1 disk] into ram disk... done.
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 92k init
Warning: unable to open an initial console.
Machine check in kernel mode.

### END  ####
-- 
Ashok Kumar Kacham
Member(Research Staff),
Central Research Laboratory,
Bharat Electronics Ltd,
Bangalore-13.


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