[U-Boot-Users] Verifying checksum problems.

[warrier at optovia.com]

Could anybody throw some light on the following problem?

We are using a MPC5200 based system and we have encountered this issue. We 
have 64MB of ram starting at 0.

We load our kernel at 1 MB. We load our associated ram-disk at 2MB. This 
ram-disk is currently 6.2MB compressed. 
When our ram-disk was smaller, around 5.8 MB everything worked without 
problems.
However since the increase in the size of the ram-disk we have encountered 
the following error. After the kernel and ram disk are loaded to their 
respective locations and we use
"bootm 100000 200000" , this is what happens.

The checksum is verified for the kernel and it is decompressed  and 
everything is fine. 
It however fails in the ram-disk checksum verification. We get a checksum 
error.

However if we move the ramdisk load address to an area above 8MB everthing 
works fine. If we load it at 7MB we see the same error. 

Since our earlier ram-disk at 5.8 MB worked we surmise that something is 
corrupting the area between 7.8MB and 8MB. Following the sequence of 
operations it seems the only thing that can do this
is the decompression of the kernel.

Is by any chance this area being used or is there some other explanation? 

As I said earlier if the ram-disk is loaded at 8MB or above everything is 
currently okay.

Thanks

Sadanand

I'm attaching our console output, it's a tad large but .......

=> run net_nfs
Using FEC ETHERNET device
TFTP from server 10.1.1.123; our IP address is 10.1.1.132
Filename 'uImage.132'.
Load address: 0x100000
Loading: #################################################################
         #################################################################
         #######
done
Bytes transferred = 699277 (aab8d hex)
Using FEC ETHERNET device
TFTP from server 10.1.1.123; our IP address is 10.1.1.132
Filename 'uRamdisk.132'.
Load address: 0x200000
Loading: #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #########################################
done
Bytes transferred = 6530033 (63a3f1 hex)
## Booting image at 00100000 ...
   Image Name:   Linux-2.4.25-CARDKN_1.0.0
   Created:      2005-02-28  18:22:14 UTC
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    699213 Bytes = 682.8 kB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
## Loading RAMDisk Image at 00200000 ...
   Image Name:   AMPRF_0.0.2
   Created:      2005-02-28  19:54:03 UTC
   Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
   Data Size:    6529969 Bytes =  6.2 MB
   Load Address: 00000000
   Entry Point:  00000000
ú  Verifying Checksum ... Bad Data CRC

U-Boot 1.1.1 (Feb 22 2005 - 17:48:12) [CARD,1.0.2]

CPU:   MPC5200 (JTAG ID 0001101d) at 396 MHz
       Bus 132 MHz, IPB 66 MHz, PCI 33 MHz
Board: MicroSys PM520
I2C:   ready
DRAM:  64 MB
FLASH: 16 MB
In:    serial
Out:   serial
Err:   serial
Net:   FEC ETHERNET
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