Hi Stafford,
On Wed, 17 Dec 2025 at 09:23, Stafford Horne <[email protected]> wrote:
> The de0 nano from Terasic is an FPGA board that we use in the OpenRISC
> community to test OpenRISC configurations. Add a base configuration for
> the board that runs an OpenRISC CPU at 50Mhz with 32MB ram, UART for
> console and some GPIOs for LEDs and switches.
>
> There is an older version of this floating around that defines all of
> the hardware on the board including SPI's, flash devices, sram, ADCs
> etc. Eventually it would be good to get the full version upstream
> but for now I think a minimal board is good to start with.
>
> Link: https://openrisc.io/tutorials/de0_nano/
> Link: https://github.com/olofk/de0_nano
>
> Signed-off-by: Stafford Horne <[email protected]>
Thanks for your patch!
> --- /dev/null
> +++ b/arch/openrisc/boot/dts/de0-nano-common.dtsi
> @@ -0,0 +1,41 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/leds/common.h>
> +
> +/ {
> + memory@0 {
> + device_type = "memory";
> + reg = <0x00000000 0x02000000>;
> + };
> +
> + leds: leds {
Move this up (or down), before (or after) all nodes with unit addresses?
> + compatible = "gpio-leds";
> + status = "okay";
Missing blank line.
> + led-heartbeat {
> + gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
> + color = <LED_COLOR_ID_GREEN>;
> + function = LED_FUNCTION_HEARTBEAT;
> + linux,default-trigger = "heartbeat";
> + label = "heartbeat";
> + };
> + };
> +
> + gpio0: gpio@91000000 {
> + compatible = "opencores,gpio", "brcm,bcm6345-gpio";
> + reg = <0x91000000 0x1>, <0x91000001 0x1>;
> + reg-names = "dat", "dirout";
> + gpio-controller;
> + #gpio-cells = <2>;
> + status = "okay";
"okay" is the default, so you could drop this line.
> + };
> +
> + gpio1: gpio@92000000 {
> + compatible = "opencores,gpio", "brcm,bcm6345-gpio";
> + reg = <0x92000000 0x1>, <0x92000001 0x1>;
> + reg-names = "dat", "dirout";
> + gpio-controller;
> + #gpio-cells = <2>;
> + status = "disabled";
> + };
> +};
> --- /dev/null
> +++ b/arch/openrisc/boot/dts/de0-nano.dts
> @@ -0,0 +1,54 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/dts-v1/;
> +
> +#include "de0-nano-common.dtsi"
> +
> +/ {
> + model = "Terasic DE0 Nano";
> + compatible = "opencores,or1ksim";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + interrupt-parent = <&pic>;
> +
> + aliases {
> + uart0 = &serial0;
> + };
> +
> + chosen {
> + bootargs = "earlycon";
Do you need this?
> + stdout-path = "uart0:115200";
> + };
> +
> + cpus {
> + #address-cells = <1>;
> + #size-cells = <0>;
Missing blank line.
> + cpu@0 {
> + compatible = "opencores,or1200-rtlsvn481";
> + reg = <0>;
> + clock-frequency = <50000000>;
> + };
> + };
> +
> + /*
> + * OR1K PIC is built into CPU and accessed via special purpose
> + * registers. It is not addressable and, hence, has no 'reg'
> + * property.
> + */
> + pic: pic {
> + compatible = "opencores,or1k-pic";
> + #interrupt-cells = <1>;
> + interrupt-controller;
> + };
> +
> + serial0: serial@90000000 {
> + compatible = "opencores,uart16550-rtlsvn105", "ns16550a";
> + reg = <0x90000000 0x100>;
> + interrupts = <2>;
> + clock-frequency = <50000000>;
> + };
> +};
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
