Ravpower wd03 does not start with openwrt master

Hmmm, the error seems to be related to checksums, as if U-Boot isn't getting all of the kernel or something.

Failing

   Data Size:    1577517 Bytes =  1.5 MB

Succeeding

   Data Size:    1572417 Bytes =  1.5 MB

Crossing some "imaginary" line in U-Boot, perhaps??

>>> 1.5 * 1024 * 1024
1572864.0

I'd try a build with a smaller kernel. Try, perhaps, adding to your .config some options to strip down things more -- maybe that will drop your kernel below 1,572,864 and it will "magically" work. (This is a pure guess.)

CONFIG_STRIP_KERNEL_EXPORTS=y
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