Rockchip Debugging
Serial console, boot logs, JTAG and the usual suspects when a board will not boot.
The debug UART is your most important tool. Rockchip SoCs print DDR init, SPL and U-Boot logs long before Linux starts. Most boot failures can be classified by the last line printed on the serial console.
Key points
- Debug UART runs at 1500000 baud on most modern Rockchip SoCs (115200 on some older/vendor configs).
- Nothing at all on UART → power, crystal, or BootROM finding no loader (check for MaskROM on USB).
- Stuck after DDR init → wrong DDR blob or memory hardware; stuck in kernel → DTB or rootfs.