add README/HowTo to build idbloader.img

Signed-off-by: Kabbone <tobias@opel-online.de>
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Kabbone 2020-03-22 14:52:49 +01:00
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# H1 How to build your own idbloader.img file
```
$ mkimage -n rk3328 -T rksd -d rk3328_ddr_333MHz_v1.13.bin idbloader.img
$ cat rk3328_miniloader_v2.46.bin >> idbloader.img
# dd if=idbloader.img of=/dev/sdx seek=64 conv=notrunc
```