Erez Koelewyn wrote:
Hi,
I am using the M5282EVB configuration. I have come across the following problem: I load a compressed linux image into address 400000 (I leave enough room for it to be decompressed at address 100000). I then run -> bootm 400000 This works fine (the image is decompressed at address 100000 and runs correctly).
Now I reset the board, download the compressed image again (using iminfo to very it's header is there and correct) and again I run -> bootm 400000
This time I get an exception (this happens consistently until I program U-Boot again into FLASH, at which time I can again use bootm successfully only once):
-> bootm 400000 ## Booting image at 00400000 ... Image Name: Image Type: M68K Linux Standalone Program (gzip compressed) Data Size: 1249874 Bytes = 1.2 MB Load Address: 00100000 Entry Point: 00100000 Verifying Checksum ... OK Uncompressing Standalone Application ...
*** Unexpected exception *** Vector Number: 3 Format: 04 Fault Status: 4
PC: 00fe5d48 SR: 00002704 SP: 00f9155c D0: 00000000 D1: 00000000 D2: 00000000 D3: 0000011a D4: 00000000 D5: 00000000 D6: 004000d8 D7: 00fa1f90 A0: 00000009 A1: 00fac8e0 A2: 00fa28e0 A3: 00f91afe A4: 00fa2928 A5: 00ff7600 A6: 00f91ad4
*** Please Reset Board! ***
The problem cannot e related to overwriting critical areas in RAM because I don't overwrite U-Boot's region or the region where I store the packaged image.
Did anyone come across this problem
Thanks, Erez
I'm clueless but that never stopped me from guessing. ;-)
It sounds like your linux image is scribbling in flash, messing up u-boot (but not fatally). Do you have a flash file system configured in your linux image? Any other reason your linux image would overwrite flash? If you dump the end portion of the *flash* u-boot image before and after the successful linux boot, does it show corruption?
If that isn't the problem the follow up question is: what is the unexpected exception vector number 3, what is the meaning of the PC (where the exception occurred), what does the stack tell you when you dump it?
Good luck, gvb