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Use fastboot to boot from USB?

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Is it possbile to use https://github.com/yifanlu/Fastboot-Kindle in order to boot a custom kernel from USB (aka without flashing it?) I tried './fastboot boot uBoot' and './fastboot boot vmlinux', but I think it just booted (after downloading) the normal kernel:

Code:

downloading
done
## Booting kernel from Legacy Image at 80800000 ...
  Image Name:  Linux-3.0.35-lab126
  Image Type:  ARM Linux Kernel Image (uncompressed)
  Data Size:    3143456 Bytes =  3 MB
  Load Address: 80008000
  Entry Point:  80008000
  Verifying Checksum ... OK
  Loading Kernel Image ... OK
OK

Btw './fastboot flash kernel' worked fine.

I saw the thread "How-to: Booting U-Boot and Linux over USB", but I think activating the "Serial Download Protocol" (SDP) would require me to unscrew the board again, which I would like to avoid if possible. (Also I wasn't able to find TM401, only "TM501 BOOT_0", see here, nor CR501 here).
I feel like erasing the first 128kB of mmcblk0boot0 is not the safest method/idea, even though it might would work out all just fine!

Thanks!

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