BBB

flashrom on the BeagleBone Black

This page is WIP.

Required packages: the usual suspects.

• build-essential
• libpci-dev

Enabling SPI0

Create a file BB-SPI0-01-00A0.dts with the following contents:

/dts-v1/;
/plugin/;

/ {
    compatible = "ti,beaglebone", "ti,beaglebone-black";

    /* identification */
    part-number = "spi0pinmux";

    fragment@0 {
        target = <&am33xx_pinmux>;
        __overlay__ {
            spi0_pins_s0: spi0_pins_s0 {
                pinctrl-single,pins = <
                  0x150 0x30  /* spi0_sclk, INPUT_PULLUP | MODE0 */
                  0x154 0x30  /* spi0_d0, INPUT_PULLUP | MODE0 */
                  0x158 0x10  /* spi0_d1, OUTPUT_PULLUP | MODE0 */
                  0x15c 0x10  /* spi0_cs0, OUTPUT_PULLUP | MODE0 */
                >;
            };
        };
    };

    fragment@1 {
        target = <&spi0>;
        __overlay__ {
             #address-cells = <1>;
             #size-cells = <0>;

             status = "okay";
             pinctrl-names = "default";
             pinctrl-0 = <&spi0_pins_s0>;

             spidev@0 {
                 spi-max-frequency = <24000000>;
                 reg = <0>;
                 compatible = "linux,spidev";
            };
        };
    };
};

Compile it with

dtc -O dtb -o BB-SPI0-01-00A0.dtbo -b 0 -@ BB-SPI0-01-00A0.dts

and copy the result to /lib/firmware:

cp BB-SPI0-01-00A0.dtbo /lib/firmware/

Then enable this overlay:

echo BB-SPI0-01 > /sys/devices/bone_capemgr.*/slots

and check that it has worked:

ls -al /dev/spidev1.*

To make this persistent you have to edit /boot/uboot/uEnv.txt by appending

optargs=quiet drm.debug=7 capemgr.enable_partno=BB-SPI0-01