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doc: jh7110: describe debug UART

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Provide the settings for using the debug UART in SPL.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: E Shattow <e@freeshell.de>
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Heinrich Schuchardt 2025-04-24 14:13:15 +02:00 committed by Leo Yu-Chi Liang
parent f0b86c4dd1
commit 95c1bb5f55
1 changed files with 14 additions and 0 deletions
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14
doc/board/starfive/jh7110_common.rst
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@ -87,3 +87,17 @@ u-boot.itb via the Y-modem protocol.
Due to restrictions of the boot ROM not all X-modem implementations are
compatible. The package tio (https://github.com/tio/tio) has been found to be
usable.
Debug UART
----------
By default the SBI interface is used for the debug UART. But this only works
in main U-Boot. To enable the debug UART in SPL, too, use the following
settings::
CONFIG_DEBUG_UART=y
CONFIG_DEBUG_UART_NS16550=y
CONFIG_DEBUG_UART_BASE=0x10000000
CONFIG_SPL_DEBUG_UART_BASE=0x10000000
CONFIG_DEBUG_UART_CLOCK=24000000
CONFIG_DEBUG_UART_SHIFT=2