MK802II A20: Unterschied zwischen den Versionen

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 [[Image:Serial_mk802ii_a20.jpg]]
+==== Bootloader ====
+The stick comes with a boot1 bootloader configured to allow booting from the micro sd card. If no sd card is inserted it boots uboot as secondary bootloader from the internal nand which boots android.
+So i needed a compatible [http://linux-sunxi.org/U-Boot uboot] written to an sd card that will boot the linux kernel.
+But how to know which uboot configuration to choose? After having a few tries guessing sensible values from dram configurations of similar devices i found out about [http://linux-sunxi.org/FEL fel].
+Fel is a really cool tool for Allwinner cpus that let's you do all kind of interesting things but in our case we are interested
+in dumping data from the internal nand device. That way i was able to access the [http://linux-sunxi.org/Fex_Guide script.bin] data which is compiled from a fex file.
+Luckily there are also the [http://linux-sunxi.org/Sunxi-tools sunxi tools] which let you decompile the script.bin back to a fex file.
+And it this fex file i found the exact values in order to use for the dram config. I edited the dram file corresponding to mk802II_a20 and compiled uboot with spl.
+After writing it to an sd card i had a working secondary bootloader.