Abhishek Chr

I am using the latest Armbian Noble image (version 6.6.8) on my Banana Pi CM4. For my application, I am utilizing the Linux UART (/dev/ttyAML0), which is currently printing dmesg logs on this port. Is there a way I can disable dmesg debug logging and exclusively use /dev/ttyAML0 for my application? Thanks.

Hi @Gunjan Gupta, Please excuse my naivety. But can I use Linux_Tx pin as gpio using sysfs?

yep that worked. thanks @Gunjan Gupta

Thanks @Gunjan Gupta. I get following output: a@bananapicm4io:~$ sudo cat /sys/kernel/debug/pinctrl/ff634400.bus:pinctrl@40-pinctrl-meson/pinmux-pins Pinmux settings per pin Format: pin (name): mux_owner gpio_owner hog? pin 0 (GPIOZ_0): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_mdio pin 1 (GPIOZ_1): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_mdc pin 2 (GPIOZ_2): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_rgmii_rx_clk pin 3 (GPIOZ_3): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_rx_dv pin 4 (GPIOZ_4): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_rxd0 pin 5 (GPIOZ_5): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_rxd1 pin 6 (GPIOZ_6): ff3f0000.ethernet periphs-banks:518 function eth group eth_rxd2_rgmii pin 7 (GPIOZ_7): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_rxd3_rgmii pin 8 (GPIOZ_8): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_rgmii_tx_clk pin 9 (GPIOZ_9): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_txen pin 10 (GPIOZ_10): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_txd0 pin 11 (GPIOZ_11): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_txd1 pin 12 (GPIOZ_12): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_txd2_rgmii pin 13 (GPIOZ_13): ff3f0000.ethernet (GPIO UNCLAIMED) function eth group eth_txd3_rgmii pin 14 (GPIOZ_14): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 15 (GPIOZ_15): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 16 (GPIOH_0): ff600000.hdmi-tx (GPIO UNCLAIMED) function hdmitx group hdmitx_sda pin 17 (GPIOH_1): ff600000.hdmi-tx (GPIO UNCLAIMED) function hdmitx group hdmitx_sck pin 18 (GPIOH_2): ff600000.hdmi-tx (GPIO UNCLAIMED) function hdmitx group hdmitx_hpd_in pin 19 (GPIOH_3): ff800280.cec (GPIO UNCLAIMED) function cec_ao_b_h group cec_ao_b_h pin 20 (GPIOH_4): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 21 (GPIOH_5): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 22 (GPIOH_6): ffd1e000.i2c (GPIO UNCLAIMED) function i2c1 group i2c1_sda_h6 pin 23 (GPIOH_7): ffd1e000.i2c (GPIO UNCLAIMED) function i2c1 group i2c1_sck_h7 pin 24 (GPIOH_8): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 25 (BOOT_0): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_nand_d0 pin 26 (BOOT_1): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_nand_d1 pin 27 (BOOT_2): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_nand_d2 pin 28 (BOOT_3): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_nand_d3 pin 29 (BOOT_4): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_nand_d4 pin 30 (BOOT_5): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_nand_d5 pin 31 (BOOT_6): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_nand_d6 pin 32 (BOOT_7): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_nand_d7 pin 33 (BOOT_8): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_clk pin 34 (BOOT_9): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 35 (BOOT_10): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_cmd pin 36 (BOOT_11): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 37 (BOOT_12): (MUX UNCLAIMED) periphs-banks:549 pin 38 (BOOT_13): ffe07000.mmc (GPIO UNCLAIMED) function emmc group emmc_nand_ds pin 39 (BOOT_14): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 40 (BOOT_15): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 41 (GPIOC_0): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 42 (GPIOC_1): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 43 (GPIOC_2): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 44 (GPIOC_3): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 45 (GPIOC_4): ffe05000.mmc (GPIO UNCLAIMED) function gpio_periphs group GPIOC_4 pin 46 (GPIOC_5): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 47 (GPIOC_6): (MUX UNCLAIMED) periphs-banks:559 pin 48 (GPIOC_7): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 49 (GPIOA_0): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 50 (GPIOA_1): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 51 (GPIOA_2): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 52 (GPIOA_3): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 53 (GPIOA_4): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 54 (GPIOA_5): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 55 (GPIOA_6): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 56 (GPIOA_7): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 57 (GPIOA_8): (MUX UNCLAIMED) periphs-banks:569 pin 58 (GPIOA_9): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 59 (GPIOA_10): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 60 (GPIOA_11): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 61 (GPIOA_12): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 62 (GPIOA_13): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 63 (GPIOA_14): ffd1c000.i2c (GPIO UNCLAIMED) function i2c3 group i2c3_sda_a pin 64 (GPIOA_15): ffd1c000.i2c (GPIO UNCLAIMED) function i2c3 group i2c3_sck_a pin 65 (GPIOX_0): ffe03000.mmc (GPIO UNCLAIMED) function sdio group sdio_d0 pin 66 (GPIOX_1): ffe03000.mmc (GPIO UNCLAIMED) function sdio group sdio_d1 pin 67 (GPIOX_2): ffe03000.mmc (GPIO UNCLAIMED) function sdio group sdio_d2 pin 68 (GPIOX_3): ffe03000.mmc (GPIO UNCLAIMED) function sdio group sdio_d3 pin 69 (GPIOX_4): ffe03000.mmc (GPIO UNCLAIMED) function sdio group sdio_clk pin 70 (GPIOX_5): ffe03000.mmc (GPIO UNCLAIMED) function sdio group sdio_cmd pin 71 (GPIOX_6): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 72 (GPIOX_7): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 73 (GPIOX_8): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 74 (GPIOX_9): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 75 (GPIOX_10): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 76 (GPIOX_11): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 77 (GPIOX_12): ffd24000.serial (GPIO UNCLAIMED) function uart_a group uart_a_tx pin 78 (GPIOX_13): ffd24000.serial (GPIO UNCLAIMED) function uart_a group uart_a_rx pin 79 (GPIOX_14): ffd24000.serial (GPIO UNCLAIMED) function uart_a group uart_a_cts pin 80 (GPIOX_15): ffd24000.serial (GPIO UNCLAIMED) function uart_a group uart_a_rts pin 81 (GPIOX_16): ffd19000.pwm (GPIO UNCLAIMED) function pwm_e group pwm_e pin 82 (GPIOX_17): (MUX UNCLAIMED) (GPIO UNCLAIMED) pin 83 (GPIOX_18): (MUX UNCLAIMED) periphs-banks:595 pin 84 (GPIOX_19): (MUX UNCLAIMED) periphs-banks:596 So my GPIOX_18 pin number is 595

I get following options under pinctrl:

Hi @Gunjan Gupta, I am trying to access and use GPIOX_18 to drive a relay. gpio pin number for GPIOX_18 is 493, to access it using sysfs. But when I am trying to export it, I am getting invalid argument error. Thanks.

Hi, I am using Armbian (latest) image on Banana Pi CM4 and I don't have access to gpio493. I am getting the following error: And looks like gpiochip4xx is not available: When I modprobe this gpio number, I am getting following error: modprobe: FATAL: Module gpiochip493 not found in directory /lib/modules/6.7.2-edge-meson64 Could you please help, how can I enable gpio 493? Thanks