[PATCH v3 01/15] ARM: mvebu: add Netgear RN102 support
Sascha Hauer
s.hauer at pengutronix.de
Mon Aug 3 05:53:04 PDT 2026
On 2026-08-02 15:16, Luca Lauro via B4 Relay wrote:
> From: Luca Lauro <famlauro93l at gmail.com>
>
> This adds full support for the Netgear ReadyNAS 102, including:
>
> - board driver matching on "netgear,rn102"
> - lowlevel initialization
> - barebox overlay with environment, state backend and
> NAND partition layout
> - Kconfig entry
> - image support
>
> Signed-off-by: Luca Lauro <famlauro93l at gmail.com>
> ---
> arch/arm/boards/Makefile | 1 +
> arch/arm/boards/netgear-rn102/Makefile | 4 +
> arch/arm/boards/netgear-rn102/board.c | 243 +++++++++++++++++++++++++++++++
> arch/arm/boards/netgear-rn102/lowlevel.c | 58 ++++++++
> arch/arm/dts/Makefile | 1 +
> arch/arm/dts/armada-370-rn102-bb.dts | 82 +++++++++++
> arch/arm/mach-mvebu/Kconfig | 4 +
> images/Makefile.mvebu | 10 ++
> 8 files changed, 403 insertions(+)
>
> diff --git a/arch/arm/boards/Makefile b/arch/arm/boards/Makefile
> index dd2f2c324e..aca1b45a81 100644
> --- a/arch/arm/boards/Makefile
> +++ b/arch/arm/boards/Makefile
> @@ -64,6 +64,7 @@ obj-$(CONFIG_MACH_MARVELL_ARMADA_XP_DB) += marvell-armada-xp-db/
> obj-$(CONFIG_MACH_MX23EVK) += freescale-mx23-evk/
> obj-$(CONFIG_MACH_MX28EVK) += freescale-mx28-evk/
> obj-$(CONFIG_MACH_MYIRTECH_X335X) += myirtech-x335x/
> +obj-$(CONFIG_MACH_NETGEAR_RN102) += netgear-rn102/
> obj-$(CONFIG_MACH_NETGEAR_RN104) += netgear-rn104/
> obj-$(CONFIG_MACH_NETGEAR_RN2120) += netgear-rn2120/
> obj-$(CONFIG_MACH_NVIDIA_BEAVER) += nvidia-beaver/
> diff --git a/arch/arm/boards/netgear-rn102/Makefile b/arch/arm/boards/netgear-rn102/Makefile
> new file mode 100644
> index 0000000000..da63d2625f
> --- /dev/null
> +++ b/arch/arm/boards/netgear-rn102/Makefile
> @@ -0,0 +1,4 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +obj-y += board.o
> +lwl-y += lowlevel.o
> diff --git a/arch/arm/boards/netgear-rn102/board.c b/arch/arm/boards/netgear-rn102/board.c
> new file mode 100644
> index 0000000000..dba3d11518
> --- /dev/null
> +++ b/arch/arm/boards/netgear-rn102/board.c
> @@ -0,0 +1,243 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include <common.h>
> +#include <init.h>
> +#include <gpio.h>
> +#include <driver.h>
> +#include <of.h>
> +#include <linux/device.h>
> +#include <linux/mbus.h>
> +#include <mach/mvebu/armada-370-xp-regs.h>
> +#include <bbu.h>
> +
> +/*
> + * Early GPIO0 MMIO
> + *
> + * GPIO driver arrives too late for the disks to be
> + * ready in time for AHCI driver probe.
barebox supports deep probe which means the devices are made available
once needed or requested. Provided your dts carries the
barebox,deep-probe property you can do this:
of_device_ensure_probed_by_alias("gpio0");
of_device_ensure_probed_by_alias("gpio1");
of_device_ensure_probed_by_alias("gpio2");
>From that on the GPIO driver should be probed and you can use it.
It shouldn't be necessary to duplicate the GPIO driver here.
> +/*
> + * RN102 board driver
> + *
> + * Preferred pattern: board-specific code as a platform driver
> + * matching on the root DT node ("netgear,rn102").
> + */
> +static int rn102_probe(struct device *dev)
> +{
> + /* CFU configuration */
> + writel(0xC6, 0xf1020228);
> +
> + setup_usb0();
> + setup_bays();
> + init_disks();
> +
> + /* Barebox Update handlers */
> + bbu_register_std_file_update("bootloader", 0,
> + "/dev/nand0.bootloader",
> + filetype_kwbimage_v1);
> +
> + bbu_register_std_file_update("kernel", 0,
> + "/dev/nand0.kernel",
> + filetype_arm_zimage);
> +
> + bbu_register_std_file_update("minirootfs", 0,
> + "/dev/nand0.minirootfs",
> + filetype_gzip);
That is a creative use of barebox update handlers. They are designed for
updating barebox itself, not arbitrary other components.
I must think about this.
> +
> + return 0;
> +}
> +
> +static const struct of_device_id rn102_of_match[] = {
> + { .compatible = "netgear,rn102" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, rn102_of_match);
> +
> +static struct driver rn102_driver = {
> + .name = "rn102",
> + .probe = rn102_probe,
> + .of_match_table = rn102_of_match,
> +};
> +
> +device_platform_driver(rn102_driver);
> diff --git a/arch/arm/boards/netgear-rn102/lowlevel.c b/arch/arm/boards/netgear-rn102/lowlevel.c
> new file mode 100644
> index 0000000000..c1680cee82
> --- /dev/null
> +++ b/arch/arm/boards/netgear-rn102/lowlevel.c
> @@ -0,0 +1,58 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include <common.h>
> +#include <asm/barebox-arm.h>
> +#include <mach/mvebu/lowlevel.h>
> +#include <mach/mvebu/barebox-arm-head.h>
> +#include <mach/mvebu/armada-370-xp-regs.h>
> +
> +extern char __dtb_armada_370_rn102_bb_start[];
> +
> +#define INTERNAL_REG_BASE_ADDR 0x20080
> +
> +static __always_inline void mvebu_remap_registers(void)
> +{
> + void __iomem *base = mvebu_get_initial_int_reg_base();
> +
> + writel(MVEBU_REMAP_INT_REG_BASE, base + INTERNAL_REG_BASE_ADDR);
> +}
> +
> +/*
> + * NOTE:
> + * armada_370_xp_barebox_entry() cannot be used here because the
> + * upstream SDRAM size detection for Armada 370-XP misinterprets
> + * the DDR_SIZE_CSn registers on this board and reports an incorrect
> + * memory size (256MB instead of 512MB on RN102).
> + *
> + * Until the generic detection code is fixed, we compute the SDRAM
> + * size manually using the DDR_SIZE_CSn values.
> + */
> +static unsigned long armada_370_xp_memory_find(void)
> +{
> + unsigned long mem_size = 0;
> +
> + for (int cs = 0; cs < 4; cs++) {
> + u32 ctrl = readl(ARMADA_370_XP_SDRAM_BASE + DDR_SIZE_CSn(cs));
> +
> + /* Skip non-enabled CS */
> + if ((ctrl & DDR_SIZE_ENABLED) != DDR_SIZE_ENABLED)
> + continue;
> +
> + mem_size += (ctrl | ~DDR_SIZE_MASK) + 1;
> + }
> +
> + return mem_size;
> +}
> +
> +ENTRY_FUNCTION_MVEBU(start_netgear_rn102, r0, r1, r2)
> +{
> + void *fdt;
> +
> + arm_cpu_lowlevel_init();
> +
> + fdt = __dtb_armada_370_rn102_bb_start +
> + get_runtime_offset();
> +
> + mvebu_remap_registers();
> + barebox_arm_entry(0, armada_370_xp_memory_find(), fdt);
> +}
> diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
> index a84e09e388..5d1b21b615 100644
> --- a/arch/arm/dts/Makefile
> +++ b/arch/arm/dts/Makefile
> @@ -51,6 +51,7 @@ lwl-$(CONFIG_MACH_MARVELL_ARMADA_XP_GP) += armada-xp-gp-bb.dtb.o
> lwl-$(CONFIG_MACH_MARVELL_ARMADA_XP_DB) += armada-xp-db-bb.dtb.o
> lwl-$(CONFIG_MACH_MX28EVK) += imx28-evk.dtb.o
> lwl-$(CONFIG_MACH_MYIRTECH_X335X) += am335x-myirtech-myd.dtb.o am335x-myirtech-myd-mlo.dtb.o
> +lwl-$(CONFIG_MACH_NETGEAR_RN102) += armada-370-rn102-bb.dtb.o
> lwl-$(CONFIG_MACH_NETGEAR_RN104) += armada-370-rn104-bb.dtb.o
> lwl-$(CONFIG_MACH_NETGEAR_RN2120) += armada-xp-rn2120-bb.dtb.o
> lwl-$(CONFIG_MACH_NITROGEN6) += imx6q-nitrogen6x.dtb.o imx6dl-nitrogen6x.dtb.o imx6qp-nitrogen6_max.dtb.o
> diff --git a/arch/arm/dts/armada-370-rn102-bb.dts b/arch/arm/dts/armada-370-rn102-bb.dts
> new file mode 100644
> index 0000000000..47064cb11a
> --- /dev/null
> +++ b/arch/arm/dts/armada-370-rn102-bb.dts
> @@ -0,0 +1,82 @@
> +/*
> + * Barebox specific DT overlay for Netgear ReadyNAS 102
> + */
> +
> +#include "arm/marvell/armada-370-netgear-rn102.dts"
> +
> +/ {
> + chosen {
> + stdout-path = &uart0;
> + };
> +
> + aliases {
> + state = &state_nand;
> + };
> +
> + /* configure nand partition to store barebox environment */
> + environment {
> + compatible = "barebox,environment";
> + device-path = &nand_controller, "partname:environment";
> + };
> +
> + /* configure nand partition to store barebox-state backend */
> + state_nand: nand_state_memory {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + compatible = "barebox,state";
> + magic = <0xab67421f>;
> + backend-type = "raw";
> + backend = <&backend_state_nand>;
> + backend-storage-type = "circular";
> + backend-stridesize = <32>;
> +
> + variable at 0 {
> + reg = <0x0 0x1>;
> + type = "uint8";
> + default = <0x1>;
> + };
> + };
> +};
> +
> +&nand_controller {
> + compatible = "marvell,armada370-nand", "marvell,pxa3xx-nand";
> + status = "okay";
> +
> + nand-rb = <0>;
> + marvell,nand-keep-config;
> + nand-on-flash-bbt;
> +
> + nand-ecc-strength = <4>;
> + nand-ecc-step-size = <512>;
Please drop all the properties that are already in the upstram dts.
Sascha
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