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Editorial Team
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Asked: 2026-06-05T11:56:02+00:00

I am working on Beagle Bone Rev A5 and my UART1 and UART2 are

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I am working on Beagle Bone Rev A5 and my UART1 and UART2 are working fine with these mux settings:

echo 20 > /sys/kernel/debug/omap_mux/uart1_rxd
echo 0 > /sys/kernel/debug/omap_mux/uart1_txd
echo 1 > /sys/kernel/debug/omap_mux/spi0_d0
echo 21 > /sys/kernel/debug/omap_mux/spi0_sclk

Now I want hardware flow control enabled and for that I want to use UART4 and UART5. Can anybody help me enabling Rx,Tx,RTS,CTS of UART 4 & 5? What will be the mux setting for these UARTs?

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1 Answer

  1. Editorial Team

    This page helped me a bit:
    http://www.jerome-bernard.com/blog/2012/06/04/beaglebone-serial-ports-and-xbees/

    You have to set :

    • UART4 – RX /sys/kernel/debug/omap_mux/gpmc_wait0 26 Mode 6 – Input
    • UART4 – TX /sys/kernel/debug/omap_mux/gpmc_wpn 6 Mode 6 – Output
    • UART5 – RX /sys/kernel/debug/omap_mux/lcd_data9 24 Mode 4 – Input
    • UART5 – TX /sys/kernel/debug/omap_mux/lcd_data8 4 Mode 4 – Output
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