When the board is booted without serial cable attached (which is how most of them will be used) UART RX is left floating and sometimes picks noise, which interrupts countdown and enters U-Boot prompt instead of booting the kernel. Fix this by setting up internal pullup on UART RX pin. This does not prevent serial from working as the internal pullup is weak. Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>master
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