<br><font size=2 face="sans-serif">Could anybody throw some light on the following problem?</font>
<br>
<br><font size=2 face="sans-serif">We are using a MPC5200 based system and we have encountered this issue. We have 64MB of ram starting at 0.</font>
<br>
<br><font size=2 face="sans-serif">We load our kernel at 1 MB. We load our associated ram-disk at 2MB. This ram-disk is currently 6.2MB compressed. </font>
<br><font size=2 face="sans-serif">When our ram-disk was smaller, around 5.8 MB everything worked without problems.</font>
<br><font size=2 face="sans-serif">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</font>
<br><font size=2 face="sans-serif">"bootm 100000 200000" , this is what happens.</font>
<br>
<br><font size=2 face="sans-serif">The checksum is verified for the kernel and it is decompressed and everything is fine. </font>
<br><font size=2 face="sans-serif">It however fails in the ram-disk checksum verification. We get a checksum error.</font>
<br>
<br><font size=2 face="sans-serif">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. </font>
<br>
<br><font size=2 face="sans-serif">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</font>
<br><font size=2 face="sans-serif">is the decompression of the kernel.</font>
<br>
<br><font size=2 face="sans-serif">Is by any chance this area being used or is there some other explanation? </font>
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<br><font size=2 face="sans-serif">As I said earlier if the ram-disk is loaded at 8MB or above everything is currently okay.</font>
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<br><font size=2 face="sans-serif">Thanks</font>
<br>
<br><font size=2 face="sans-serif">Sadanand</font>
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<br><font size=2 face="sans-serif">I'm attaching our console output, it's a tad large but .......</font>
<br>
<br><font size=2 face="sans-serif">=> run net_nfs</font>
<br><font size=2 face="sans-serif">Using FEC ETHERNET device</font>
<br><font size=2 face="sans-serif">TFTP from server 10.1.1.123; our IP address is 10.1.1.132</font>
<br><font size=2 face="sans-serif">Filename 'uImage.132'.</font>
<br><font size=2 face="sans-serif">Load address: 0x100000</font>
<br><font size=2 face="sans-serif">Loading: #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #######</font>
<br><font size=2 face="sans-serif">done</font>
<br><font size=2 face="sans-serif">Bytes transferred = 699277 (aab8d hex)</font>
<br><font size=2 face="sans-serif">Using FEC ETHERNET device</font>
<br><font size=2 face="sans-serif">TFTP from server 10.1.1.123; our IP address is 10.1.1.132</font>
<br><font size=2 face="sans-serif">Filename 'uRamdisk.132'.</font>
<br><font size=2 face="sans-serif">Load address: 0x200000</font>
<br><font size=2 face="sans-serif">Loading: #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #################################################################</font>
<br><font size=2 face="sans-serif"> #########################################</font>
<br><font size=2 face="sans-serif">done</font>
<br><font size=2 face="sans-serif">Bytes transferred = 6530033 (63a3f1 hex)</font>
<br><font size=2 face="sans-serif">## Booting image at 00100000 ...</font>
<br><font size=2 face="sans-serif"> Image Name: Linux-2.4.25-CARDKN_1.0.0</font>
<br><font size=2 face="sans-serif"> Created: 2005-02-28 18:22:14 UTC</font>
<br><font size=2 face="sans-serif"> Image Type: PowerPC Linux Kernel Image (gzip compressed)</font>
<br><font size=2 face="sans-serif"> Data Size: 699213 Bytes = 682.8 kB</font>
<br><font size=2 face="sans-serif"> Load Address: 00000000</font>
<br><font size=2 face="sans-serif"> Entry Point: 00000000</font>
<br><font size=2 face="sans-serif"> Verifying Checksum ... OK</font>
<br><font size=2 face="sans-serif"> Uncompressing Kernel Image ... OK</font>
<br><font size=2 face="sans-serif">## Loading RAMDisk Image at 00200000 ...</font>
<br><font size=2 face="sans-serif"> Image Name: AMPRF_0.0.2</font>
<br><font size=2 face="sans-serif"> Created: 2005-02-28 19:54:03 UTC</font>
<br><font size=2 face="sans-serif"> Image Type: PowerPC Linux RAMDisk Image (gzip compressed)</font>
<br><font size=2 face="sans-serif"> Data Size: 6529969 Bytes = 6.2 MB</font>
<br><font size=2 face="sans-serif"> Load Address: 00000000</font>
<br><font size=2 face="sans-serif"> Entry Point: 00000000</font>
<br><font size=2 face="sans-serif">ú Verifying Checksum ... Bad Data CRC</font>
<br>
<br><font size=2 face="sans-serif">U-Boot 1.1.1 (Feb 22 2005 - 17:48:12) [CARD,1.0.2]</font>
<br>
<br><font size=2 face="sans-serif">CPU: MPC5200 (JTAG ID 0001101d) at 396 MHz</font>
<br><font size=2 face="sans-serif"> Bus 132 MHz, IPB 66 MHz, PCI 33 MHz</font>
<br><font size=2 face="sans-serif">Board: MicroSys PM520</font>
<br><font size=2 face="sans-serif">I2C: ready</font>
<br><font size=2 face="sans-serif">DRAM: 64 MB</font>
<br><font size=2 face="sans-serif">FLASH: 16 MB</font>
<br><font size=2 face="sans-serif">In: serial</font>
<br><font size=2 face="sans-serif">Out: serial</font>
<br><font size=2 face="sans-serif">Err: serial</font>
<br><font size=2 face="sans-serif">Net: FEC ETHERNET</font>