arm: mvebu: turris_omnia: user RAM freq 667 MHz if failed at 800 MHz
For some unknown reasons some boards with four 512 MiB RAM chips
(= 2 GiB RAM) sometimes fail to train correctly at 800 MHz with the new
DDR training algorithm. Use the EEPROM to count how many times the
training failed and if the training failed more than 3 times, train at
667 MHz.
Signed-off-by:
Marek Behún <marek.behun@nic.cz>
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