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Support A20 OLinuXino Lime2 and MICRO

Sunil Mohan Adapa requested to merge SunilMohanAdapa:olimex into master

Created by: SunilMohanAdapa

The pull request adds support for:

  • A20 OLinuXino Lime2
  • A20 OLinuXino MICRO

I have tested with A20 OLinuXino MICRO to boot well and access Plinth functions. I have also built Cubietruck image to check for regressions and test it. I could not test Lime2 due to poor power supply.

The change to explicitly set the value of ${fdtfile} in u-boot script is something I am sure is the best one. When we choose the appropriate u-boot for the device, it comes hardcoded with the appropriate DTB value for this variable. If we can remove the detection of kernel version using a DTB file name (say by assuming there will be only one kernel installed at the time of script execution and that it will contain the necessary DTB), then we can generalize a20_setup() to work for all Allwinner A20 devices. However, I made this change as anyway we have to pass in the DTB value and we might as well set is explicitly.

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