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CONFIG_DEBUG_MVEBU_UART0: Kernel low-level debugging messages via MVEBU UART0 (old bootloaders)

General informations

The Linux kernel configuration item CONFIG_DEBUG_MVEBU_UART0:

Help text

Say Y here if you want kernel low-level debugging support on MVEBU based platforms on UART0.

This option should be used with the old bootloaders that left the internal registers mapped at 0xd0000000. As of today, this is the case on platforms such as the Globalscale Mirabox or the Plathome OpenBlocks AX3, when using the original bootloader.

This option will not work on older Marvell platforms (Kirkwood, Dove, MV78xx0, Orion5x), which should pick the "new bootloader" variant.

If the wrong DEBUG_MVEBU_UART* option is selected, when u-boot hands over to the kernel, the system silently crashes, with no serial output at all.

Hardware

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