Recently, I've been seeing a lot of the 'bad gzip magic number'
It happens everytime I start up after replacing my file system image. I noted that the important notice on the reflashing page about turning off sumtool and padding the system automatically. padding makes a reflash take 1 hour via serial though, and I think I was able to reboot before with no problems.
what does bad gzip magic number mean, and how can I fix it?
I'm going back to the default config for gumstix-buildroot for 1522 and will report the results.

here is the boot message:

U-Boot 1.2.0 (May 16 2007 - 11:14:35) - PXA270@600 MHz - 1407

*** Welcome to Gumstix ***

DRAM:  128 MB
Flash: 32 MB
Using default environment

Net:   SMC91C1111-0
Hit any key to stop autoboot:  0
Instruction Cache is ON
Copying kernel to 0xa2000000 from 0x01f00000 (length 0x00100000)...done
## Booting image at a2000000 ...
   Image Name:   uImage
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1049016 Bytes =  1 MB
   Load Address: a0008000
   Entry Point:  a0008000

Starting kernel ...

bad gzip magic numbers

 -- System halted
Starting kernel ...