Re: Kerenel crashes every other Boot..

Hi Ravi,

I think dumping only the first couple kilbytes is not enough to be sure.
Even a single byte later on can corrupt the image. You need to make sure
that the complete image is correct.

I don't know about the TLB setup changes.

Wolfgang

ravi.rao@rflelect.com wrote:

Hi Wolfgang, The image is getting loaded from the flash. I am able to
hook up BDI2000 and dump various locations. I dumped first few kilo
byte locations of the image and looks no corruption. I also tried
this on another board and l see the same behaviour.

Also the board I am using is an existing product but it is running 
2.4.18 kernel. Hardware of our next gen product will be based on the
existing board but it will run 2.6.21 kernel. So to speed software
development I am using the existing product as the refernce and
trying to put 2.6.21.

Other paculiar thing that I have seen is Once I reset the power to 
chasis or pull the card out and put it back in  it gets stuck at "Now
 booting the kernel" stage and upon hooking BDI2000 it looks like it 
hangs in early_init function at the call *to 
memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start). Only way to
 get it back working is by burning a 2.4 kernel rebooting the card
and again burning the 2.6 one..*Any idea what may be happening.....

The only difference i see in 2.4.x initial code and 2.6.x init code
is the wired tlb setup in head_4xx.S. Do you know why the wired tlb
setup code got removed from 2.6 ??

Thanks, Ravishankar Govindarao RFL Electronics Inc. E-mail :
_Ravi.Rao@rflelect.com_ <mailto:Ravi.Rao@rflelect.com> Voice:
973.334.3100 Ext. 233 Fax: 973.334.3863




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*Wolfgang Reissnegger [off-list ref]*

08/22/2007 11:36 AM

 To ravi.rao@rflelect.com cc linuxppc-embedded@ozlabs.org Subject Re:
Kerenel crashes every other Boot..








Hi Ravi,

my first guess would be that there is a problem with your RAM. Could
be the RAM timing or just a bad RAM chip.

Try to run the image on another board, see if it works there. If not
you can check the RAM timing. Given that you have a custom board
there could be some design issues.

Where are you loading the image from? Maybe there is a problem in 
transferring the image into RAM so the image download corrupts the
data?

Cheers, Wolfgang

ravi.rao@rflelect.com wrote:

quoted

Hi, Some times it crashes and many times it comes back with an
error as Junk in compressed Image.. Below is the screen dump.. 
**************** When it does not work ************************** 
BOOT MONITOR: .. eth driver not initialized. command aborted ..
Invoking Linux PPC Kernel Loader at 0xfe800000 .. Boot Parms:
0x3f72314, Flags: 0x1014, Verbose: 0x3

loaded at:     FE800000 FEA16124 relocated to:  00400000 00616124 
board data at: 03F72314 03F72510 relocated to:  00613000 006131FC 
zimage at:     00404EDC 0061289C avail ram:     00617000 04000000

Linux/PPC load: console=ttyS0,9600 ip=dhcp root=nfs Uncompressing
Linux...done. Now booting the kernel Linux version 2.6.21
(root@localhost.localdomain) (gcc version 4.1.0 20060304 (TimeSys
4.1.0-3)) #27 Wed Aug 22 10:10:4 2 EDT 2007 MAC 0:
00:50:cc:0c:e2:30 MAC 1: 00:50:c2:0c:e2:31 Zone PFN ranges: DMA
0 ->    16384 Normal      16384 ->    16384 early_node_map[1]
active PFN ranges 0:        0 ->    16384 Built 1 zonelists.  Total
pages: 16256 Kernel command line: console=ttyS0,9600 root=/dev/rd/0
 ip=10.2.254.33:10.2.1.1:10.2.0.1:255.255.0.0:unknown:eth0 PID hash
table entries: 256 (order: 8, 1024 bytes) Dentry cache hash table
entries: 8192 (order: 3, 32768 bytes) Inode-cache hash table
entries: 4096 (order: 2, 16384 bytes) Memory: 61952k available
(1188k kernel code, 280k data, 1504k init, 0k highmem) Mount-cache
hash table entries: 512 Kernel panic - not syncing: junk in
compressed archive Rebooting in 180 seconds..

******************** When it works ************************** BOOT
MONITOR: .. eth driver not initialized. command aborted .. Invoking
Linux PPC Kernel Loader at 0xfe800000 .. Boot Parms: 0x3f72314,
Flags: 0x1014, Verbose: 0x3

loaded at:     FE800000 FEA16124 relocated to:  00400000 00616124 
board data at: 03F72314 03F72510 relocated to:  00613000 006131FC 
zimage at:     00404EDC 0061289C avail ram:     00617000 04000000

Linux/PPC load: console=ttyS0,9600 ip=dhcp root=nfs Uncompressing
Linux...done. Now booting the kernel Linux version 2.6.21
(root@localhost.localdomain) (gcc version 4.1.0 20060304 (TimeSys
4.1.0-3)) #27 Wed Aug 22 10:10:4 2 EDT 2007 MAC 0:
00:50:cc:0c:e2:30 MAC 1: 00:50:c2:0c:e2:31 Zone PFN ranges: DMA
0 ->    16384 Normal      16384 ->    16384 early_node_map[1]
active PFN ranges 0:        0 ->    16384 Built 1 zonelists.  Total
pages: 16256 Kernel command line: console=ttyS0,9600 root=/dev/rd/0
 ip=10.2.254.33:10.2.1.1:10.2.0.1:255.255.0.0:unknown:eth0 PID hash
table entries: 256 (order: 8, 1024 bytes) Dentry cache hash table
entries: 8192 (order: 3, 32768 bytes) Inode-cache hash table
entries: 4096 (order: 2, 16384 bytes) Memory: 61952k available
(1188k kernel code, 280k data, 1504k init, 0k highmem) Mount-cache
hash table entries: 512 JFFS2 version 2.2. (NAND) (C) 2001-2006 Red
Hat, Inc. io scheduler noop registered io scheduler anticipatory
registered io scheduler deadline registered io scheduler cfq
registered (default) Serial: 8250/16550 driver $Revision: 1.90 $ 4
ports, IRQ sharing enabled serial8250: ttyS0 at MMIO 0x0 (irq = 0)
is a 16550A serial8250: ttyS1 at MMIO 0x0 (irq = 1) is a 16550A 
RAMDISK driver initialized: 1 RAM disks of 16384K size 1024
blocksize loop: loaded (max 8 devices) i2c /dev entries driver IBM
IIC driver v2.1 ibm-iic0: using standard (100 kHz) mode Freeing
unused kernel memory: 1504k init serial console detected.
Disabling virtual terminals. init started:  BusyBox v0.60.2
(2003.04.29-11:32+0000) multi-call binary Bummer, could not run
'/etc/init.d/rcS': No such file or directory

Please press Enter to activate this console. sh-2.05#

Ravishankar Govindarao RFL Electronics Inc. E-mail :
_Ravi.Rao@rflelect.com_ <mailto:Ravi.Rao@rflelect.com> Voice:
973.334.3100 Ext. 233 Fax: 973.334.3863




_CONFIDENTIALITY NOTE_

This e-mail, including any attachments, may contain confidential
and/or legally privileged information.  The Information is intended
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If you are not the intended recipient, you are hereby notified that
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strictly prohibited. Further, if you are not the intended
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Information promptly.








*Wolfgang Reissnegger [off-list ref]*

08/22/2007 11:15 AM


To ravi.rao@rflelect.com cc linuxppc-embedded@ozlabs.org Subject 
Re: Kerenel crashes every other Boot..








Hi Ravi,

you need to provide more information, for example, where does the
kernel crash, any serial console output that you see when it
crashes, etc.

Cheers, Wolfgang


ravi.rao@rflelect.com wrote:

quoted

Hi All, I have a PPC 405EP custom target. I based most of my
software on the EP405 Taihu reference and now I am able to load
the 2.6.21 kernel and with a minimum initramfs I also get the
busy box prompt. I see a strange poblem it fails(linux crashes)
every other boot. Can any one please tell me what may be
happening ??? Thanks, Ravishankar Govindarao RFL Electronics Inc.
 E-mail : _Ravi.Rao@rflelect.com_ <mailto:Ravi.Rao@rflelect.com> 
Voice: 973.334.3100 Ext. 233 Fax: 973.334.3863




_CONFIDENTIALITY NOTE_

This e-mail, including any attachments, may contain confidential
and/or legally privileged information.  The Information is
intended only for the use of the individual or entity named on
this e-mail .  If you are not the intended recipient, you are
hereby notified that any disclosure, copying, distribution, or
the taking of any action in reliance on the contents of this
transmitted Information is strictly prohibited. Further, if you
are not the intended recipient, please notify us by return e-mail
and delete the Information promptly.








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