I do not know what a Debug UART is (different than Serial Console?) and did not test on hardware available to me but the description sounds reasonable enough.
On 4/24/25 05:13, Heinrich Schuchardt wrote: > Provide the settings for using the debug UART in SPL. > > Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com> > --- > v4: > no change > v3: > no change > v2: > new patch > --- > doc/board/starfive/jh7110_common.rst | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/doc/board/starfive/jh7110_common.rst > b/doc/board/starfive/jh7110_common.rst > index fb8d87a1551..4a8058ee5da 100644 > --- a/doc/board/starfive/jh7110_common.rst > +++ b/doc/board/starfive/jh7110_common.rst > @@ -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 Reviewed-by: E Shattow <e...@freeshell.de>
