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eebrah|FTS>
join #imx6-dongle
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eebrah|FTS>
join #imx6-dongle
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mattmon>
Can anyone advise as to how to configure an
_interactive_ serial console (so can login via getty) on a rk3188 dongle?
<
mattmon>
So far, have only been able to see kernel messages at boot - attempting to use the serial port after the system is up does not seem to work.
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Galland>
mattmon : have you soldered three wires to your rk3188: tx, rx, gnd?
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mattmon>
Galland: Yes, serial mod is done - any ideas for how to achieve interactive login?
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mattmon>
My intention is to use the dongle as a tiny headless server.
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hramrach>
mattmon: what are you using to connect?
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hramrach>
in general you need to turn off hardware flow control which defaults to random value and you don't have wires for that
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hramrach>
other than wiring the serial port correctly
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hramrach>
and actually running a getty at the correct speed
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mattmon>
hramrach: I'm connecting with a Bus Pirate in UART mode, 115200,8,N,1
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mattmon>
I can see kernel boot messages, however configuring getty on ttyS0, ttyS1 or ttyFIQ0 does nothing
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mattmon>
even echoing to serial device(s) from root shell on dongle produces no output to bus pirate
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mattmon>
kernel compiled from Galland's 'rockchip-rk3188-mk908' repo
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hramrach>
that's odd
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hramrach>
either it does use the serial port or it does not
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hramrach>
but there is one more option
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hramrach>
you might have no (enabled) serial driver at all an kernel sets up early console with whatever is loft over by bootloader
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hramrach>
that's how early printk works on aw hardware so why not rk as well
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mattmon>
OK, thanks, you actually clarified my understanding a bit
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mattmon>
I compiled the default rk3188_Tronsmart_MK908_galland_defconfig
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mattmon>
any specific config options you suggest I check/enable?
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hramrach>
I have no idea about rk config. you probably want some serial suppport enabled but you need that in your board.c as well as your config
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hramrach>
the rk kernel is configured by writing a board.c file which defines what is connected where :/
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hramrach>
actually, since you don't get serial port on the stick normally you probably need to modify the file
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hramrach>
what repo did you use? omagamoon hacked a stick with serial output so maybe his repo might have the configs for that?
<
hramrach>
*omegamoon
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mattmon>
used Galland fork of Omegamoon
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mattmon>
CONFIG_SERIAL_RK29_CONSOLE not set in my .config
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mattmon>
here's the relevant .config snippet
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mattmon>
CONFIG_RK_DEBUG_UART=2
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mattmon>
CONFIG_SERIAL_CORE=y
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mattmon>
CONFIG_SERIAL_RK29=y
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mattmon>
CONFIG_UART0_RK29=y
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mattmon>
# CONFIG_SERIAL_TIMBERDALE is not set
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mattmon>
CONFIG_UART0_CTS_RTS_RK29=y
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mattmon>
CONFIG_UART0_DMA_RK29=0
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mattmon>
# CONFIG_UART1_RK29 is not set
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mattmon>
# CONFIG_UART2_RK29 is not set
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mattmon>
CONFIG_UART3_RK29=y
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mattmon>
CONFIG_UART3_CTS_RTS_RK29=y
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mattmon>
CONFIG_UART3_DMA_RK29=0
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mattmon>
# CONFIG_SERIAL_RK29_CONSOLE is not set
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mattmon>
so am I physically connected to UART2 because I can see kernel boot messages?