Re: [PATCH v4 03/20] hw/arm/allwinner-h3: add Clock Control Unit

[Niek Linnenbank <nieklinnenbank@gmail.com>]

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Hi Philippe,

On Sun, Jan 19, 2020 at 7:34 PM Philippe Mathieu-Daudé <philmd@redhat.com>
wrote:

> On 1/19/20 1:50 AM, Niek Linnenbank wrote:
> > The Clock Control Unit is responsible for clock signal generation,
> > configuration and distribution in the Allwinner H3 System on Chip.
> > This commit adds support for the Clock Control Unit which emulates
> > a simple read/write register interface.
> >
> > Signed-off-by: Niek Linnenbank <nieklinnenbank@gmail.com>
> > ---
> >   include/hw/arm/allwinner-h3.h      |   3 +
> >   include/hw/misc/allwinner-h3-ccu.h |  66 ++++++++
> >   hw/arm/allwinner-h3.c              |   9 +-
> >   hw/misc/allwinner-h3-ccu.c         | 243 +++++++++++++++++++++++++++++
> >   hw/misc/Makefile.objs              |   1 +
> >   5 files changed, 321 insertions(+), 1 deletion(-)
> >   create mode 100644 include/hw/misc/allwinner-h3-ccu.h
> >   create mode 100644 hw/misc/allwinner-h3-ccu.c
> >
> > diff --git a/include/hw/arm/allwinner-h3.h
> b/include/hw/arm/allwinner-h3.h
> > index 2aac9b78ec..abdc20871a 100644
> > --- a/include/hw/arm/allwinner-h3.h
> > +++ b/include/hw/arm/allwinner-h3.h
> > @@ -39,6 +39,7 @@
> >   #include "hw/arm/boot.h"
> >   #include "hw/timer/allwinner-a10-pit.h"
> >   #include "hw/intc/arm_gic.h"
> > +#include "hw/misc/allwinner-h3-ccu.h"
> >   #include "target/arm/cpu.h"
> >
> >   /**
> > @@ -55,6 +56,7 @@ enum {
> >       AW_H3_SRAM_A1,
> >       AW_H3_SRAM_A2,
> >       AW_H3_SRAM_C,
> > +    AW_H3_CCU,
> >       AW_H3_PIT,
> >       AW_H3_UART0,
> >       AW_H3_UART1,
> > @@ -97,6 +99,7 @@ typedef struct AwH3State {
> >       ARMCPU cpus[AW_H3_NUM_CPUS];
> >       const hwaddr *memmap;
> >       AwA10PITState timer;
> > +    AwH3ClockCtlState ccu;
> >       GICState gic;
> >       MemoryRegion sram_a1;
> >       MemoryRegion sram_a2;
> > diff --git a/include/hw/misc/allwinner-h3-ccu.h
> b/include/hw/misc/allwinner-h3-ccu.h
> > new file mode 100644
> > index 0000000000..9c8a887782
> > --- /dev/null
> > +++ b/include/hw/misc/allwinner-h3-ccu.h
> > @@ -0,0 +1,66 @@
> > +/*
> > + * Allwinner H3 Clock Control Unit emulation
> > + *
> > + * Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com>
> > + *
> > + * This program is free software: you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation, either version 2 of the License, or
> > + * (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License
> > + * along with this program.  If not, see <http://www.gnu.org/licenses/
> >.
> > + */
> > +
> > +#ifndef HW_MISC_ALLWINNER_H3_CCU_H
> > +#define HW_MISC_ALLWINNER_H3_CCU_H
> > +
> > +#include "qom/object.h"
> > +#include "hw/sysbus.h"
> > +
> > +/**
> > + * @name Constants
> > + * @{
> > + */
> > +
> > +/** Highest register address used by CCU device */
> > +#define AW_H3_CCU_REGS_MAXADDR  (0x304)
>
> There might be a migration issue if one day we see some firmware
> accessing some undocumented register > 0x304 (you'd need to migrate more
> than 0x304/4 registers, so increase allwinner_h3_ccu_vmstate.version_id.
>
> I'd simply replace this definition by
>
>    #define AW_H3_CCU_IOSIZE 0x400
>
> And see comment in write().
>

Good point, thanks I'll change that to 0x400!


>
> > +
> > +/** Total number of known registers */
> > +#define AW_H3_CCU_REGS_NUM      (AW_H3_CCU_REGS_MAXADDR /
> sizeof(uint32_t))
> > +
> > +/** @} */
> > +
> > +/**
> > + * @name Object model
> > + * @{
> > + */
> > +
> > +#define TYPE_AW_H3_CCU    "allwinner-h3-ccu"
> > +#define AW_H3_CCU(obj) \
> > +    OBJECT_CHECK(AwH3ClockCtlState, (obj), TYPE_AW_H3_CCU)
> > +
> > +/** @} */
> > +
> > +/**
> > + * Allwinner H3 CCU object instance state.
> > + */
> > +typedef struct AwH3ClockCtlState {
> > +    /*< private >*/
> > +    SysBusDevice parent_obj;
> > +    /*< public >*/
> > +
> > +    /** Maps I/O registers in physical memory */
> > +    MemoryRegion iomem;
> > +
> > +    /** Array of hardware registers */
> > +    uint32_t regs[AW_H3_CCU_REGS_NUM];
> > +
> > +} AwH3ClockCtlState;
> > +
> > +#endif /* HW_MISC_ALLWINNER_H3_CCU_H */
> > diff --git a/hw/arm/allwinner-h3.c b/hw/arm/allwinner-h3.c
> > index efe6042af3..8df8e3e05e 100644
> > --- a/hw/arm/allwinner-h3.c
> > +++ b/hw/arm/allwinner-h3.c
> > @@ -36,6 +36,7 @@ const hwaddr allwinner_h3_memmap[] = {
> >       [AW_H3_SRAM_A1]    = 0x00000000,
> >       [AW_H3_SRAM_A2]    = 0x00044000,
> >       [AW_H3_SRAM_C]     = 0x00010000,
> > +    [AW_H3_CCU]        = 0x01c20000,
> >       [AW_H3_PIT]        = 0x01c20c00,
> >       [AW_H3_UART0]      = 0x01c28000,
> >       [AW_H3_UART1]      = 0x01c28400,
> > @@ -77,7 +78,6 @@ struct AwH3Unimplemented {
> >       { "usb2",      0x01c1c000, 4 * KiB },
> >       { "usb3",      0x01c1d000, 4 * KiB },
> >       { "smc",       0x01c1e000, 4 * KiB },
> > -    { "ccu",       0x01c20000, 1 * KiB },
> >       { "pio",       0x01c20800, 1 * KiB },
> >       { "owa",       0x01c21000, 1 * KiB },
> >       { "pwm",       0x01c21400, 1 * KiB },
> > @@ -172,6 +172,9 @@ static void allwinner_h3_init(Object *obj)
> >                                 "clk0-freq", &error_abort);
> >       object_property_add_alias(obj, "clk1-freq", OBJECT(&s->timer),
> >                                 "clk1-freq", &error_abort);
> > +
> > +    sysbus_init_child_obj(obj, "ccu", &s->ccu, sizeof(s->ccu),
> > +                          TYPE_AW_H3_CCU);
> >   }
> >
> >   static void allwinner_h3_realize(DeviceState *dev, Error **errp)
> > @@ -277,6 +280,10 @@ static void allwinner_h3_realize(DeviceState *dev,
> Error **errp)
> >       memory_region_add_subregion(get_system_memory(),
> s->memmap[AW_H3_SRAM_C],
> >                                   &s->sram_c);
> >
> > +    /* Clock Control Unit */
> > +    qdev_init_nofail(DEVICE(&s->ccu));
> > +    sysbus_mmio_map(SYS_BUS_DEVICE(&s->ccu), 0, s->memmap[AW_H3_CCU]);
> > +
> >       /* UART0. For future clocktree API: All UARTS are connected to
> APB2_CLK. */
> >       serial_mm_init(get_system_memory(), s->memmap[AW_H3_UART0], 2,
> >                      qdev_get_gpio_in(DEVICE(&s->gic),
> AW_H3_GIC_SPI_UART0),
> > diff --git a/hw/misc/allwinner-h3-ccu.c b/hw/misc/allwinner-h3-ccu.c
> > new file mode 100644
> > index 0000000000..ccf58ccdf2
> > --- /dev/null
> > +++ b/hw/misc/allwinner-h3-ccu.c
> > @@ -0,0 +1,243 @@
> > +/*
> > + * Allwinner H3 Clock Control Unit emulation
> > + *
> > + * Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com>
> > + *
> > + * This program is free software: you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation, either version 2 of the License, or
> > + * (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License
> > + * along with this program.  If not, see <http://www.gnu.org/licenses/
> >.
> > + */
> > +
> > +#include "qemu/osdep.h"
> > +#include "qemu/units.h"
> > +#include "hw/sysbus.h"
> > +#include "migration/vmstate.h"
> > +#include "qemu/log.h"
> > +#include "qemu/module.h"
> > +#include "hw/misc/allwinner-h3-ccu.h"
> > +
> > +/* CCU register offsets */
> > +enum {
> > +    REG_PLL_CPUX             = 0x0000, /* PLL CPUX Control */
> > +    REG_PLL_AUDIO            = 0x0008, /* PLL Audio Control */
> > +    REG_PLL_VIDEO            = 0x0010, /* PLL Video Control */
> > +    REG_PLL_VE               = 0x0018, /* PLL VE Control */
> > +    REG_PLL_DDR              = 0x0020, /* PLL DDR Control */
> > +    REG_PLL_PERIPH0          = 0x0028, /* PLL Peripherals 0 Control */
> > +    REG_PLL_GPU              = 0x0038, /* PLL GPU Control */
> > +    REG_PLL_PERIPH1          = 0x0044, /* PLL Peripherals 1 Control */
> > +    REG_PLL_DE               = 0x0048, /* PLL Display Engine Control */
> > +    REG_CPUX_AXI             = 0x0050, /* CPUX/AXI Configuration */
> > +    REG_APB1                 = 0x0054, /* ARM Peripheral Bus 1 Config */
> > +    REG_APB2                 = 0x0058, /* ARM Peripheral Bus 2 Config */
> > +    REG_DRAM_CFG             = 0x00F4, /* DRAM Configuration */
> > +    REG_MBUS                 = 0x00FC, /* MBUS Reset */
> > +    REG_PLL_TIME0            = 0x0200, /* PLL Stable Time 0 */
> > +    REG_PLL_TIME1            = 0x0204, /* PLL Stable Time 1 */
> > +    REG_PLL_CPUX_BIAS        = 0x0220, /* PLL CPUX Bias */
> > +    REG_PLL_AUDIO_BIAS       = 0x0224, /* PLL Audio Bias */
> > +    REG_PLL_VIDEO_BIAS       = 0x0228, /* PLL Video Bias */
> > +    REG_PLL_VE_BIAS          = 0x022C, /* PLL VE Bias */
> > +    REG_PLL_DDR_BIAS         = 0x0230, /* PLL DDR Bias */
> > +    REG_PLL_PERIPH0_BIAS     = 0x0234, /* PLL Peripherals 0 Bias */
> > +    REG_PLL_GPU_BIAS         = 0x023C, /* PLL GPU Bias */
> > +    REG_PLL_PERIPH1_BIAS     = 0x0244, /* PLL Peripherals 1 Bias */
> > +    REG_PLL_DE_BIAS          = 0x0248, /* PLL Display Engine Bias */
> > +    REG_PLL_CPUX_TUNING      = 0x0250, /* PLL CPUX Tuning */
> > +    REG_PLL_DDR_TUNING       = 0x0260, /* PLL DDR Tuning */
> > +};
> > +
> > +#define REG_INDEX(offset)    (offset / sizeof(uint32_t))
> > +
> > +/* CCU register flags */
> > +enum {
> > +    REG_DRAM_CFG_UPDATE      = (1 << 16),
> > +};
> > +
> > +enum {
> > +    REG_PLL_ENABLE           = (1 << 31),
> > +    REG_PLL_LOCK             = (1 << 28),
> > +};
> > +
> > +
> > +/* CCU register reset values */
> > +enum {
> > +    REG_PLL_CPUX_RST         = 0x00001000,
> > +    REG_PLL_AUDIO_RST        = 0x00035514,
> > +    REG_PLL_VIDEO_RST        = 0x03006207,
> > +    REG_PLL_VE_RST           = 0x03006207,
> > +    REG_PLL_DDR_RST          = 0x00001000,
> > +    REG_PLL_PERIPH0_RST      = 0x00041811,
> > +    REG_PLL_GPU_RST          = 0x03006207,
> > +    REG_PLL_PERIPH1_RST      = 0x00041811,
> > +    REG_PLL_DE_RST           = 0x03006207,
> > +    REG_CPUX_AXI_RST         = 0x00010000,
> > +    REG_APB1_RST             = 0x00001010,
> > +    REG_APB2_RST             = 0x01000000,
> > +    REG_DRAM_CFG_RST         = 0x00000000,
> > +    REG_MBUS_RST             = 0x80000000,
> > +    REG_PLL_TIME0_RST        = 0x000000FF,
> > +    REG_PLL_TIME1_RST        = 0x000000FF,
> > +    REG_PLL_CPUX_BIAS_RST    = 0x08100200,
> > +    REG_PLL_AUDIO_BIAS_RST   = 0x10100000,
> > +    REG_PLL_VIDEO_BIAS_RST   = 0x10100000,
> > +    REG_PLL_VE_BIAS_RST      = 0x10100000,
> > +    REG_PLL_DDR_BIAS_RST     = 0x81104000,
> > +    REG_PLL_PERIPH0_BIAS_RST = 0x10100010,
> > +    REG_PLL_GPU_BIAS_RST     = 0x10100000,
> > +    REG_PLL_PERIPH1_BIAS_RST = 0x10100010,
> > +    REG_PLL_DE_BIAS_RST      = 0x10100000,
> > +    REG_PLL_CPUX_TUNING_RST  = 0x0A101000,
> > +    REG_PLL_DDR_TUNING_RST   = 0x14880000,
> > +};
> > +
> > +static uint64_t allwinner_h3_ccu_read(void *opaque, hwaddr offset,
> > +                                      unsigned size)
> > +{
> > +    const AwH3ClockCtlState *s = AW_H3_CCU(opaque);
> > +    const uint32_t idx = REG_INDEX(offset);
> > +
> > +    if (idx >= AW_H3_CCU_REGS_NUM) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset
> 0x%04x\n",
> > +                      __func__, (uint32_t)offset);
>
> See comment in write().
>
> > +        return 0;
> > +    }
> > +
> > +    return s->regs[idx];
> > +}
> > +
> > +static void allwinner_h3_ccu_write(void *opaque, hwaddr offset,
> > +                                   uint64_t val, unsigned size)
> > +{
> > +    AwH3ClockCtlState *s = AW_H3_CCU(opaque);
> > +    const uint32_t idx = REG_INDEX(offset);
> > +
> > +    if (idx >= AW_H3_CCU_REGS_NUM) {
> > +        qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset
> 0x%04x\n",
> > +                      __func__, (uint32_t)offset);
>
> I'd replace this check by ...
>
> > +        return;
> > +    }
> > +
> > +    switch (offset) {
> > +    case REG_DRAM_CFG:    /* DRAM Configuration */
> > +        val &= ~REG_DRAM_CFG_UPDATE;
> > +        break;
> > +    case REG_PLL_CPUX:    /* PLL CPUX Control */
> > +    case REG_PLL_AUDIO:   /* PLL Audio Control */
> > +    case REG_PLL_VIDEO:   /* PLL Video Control */
> > +    case REG_PLL_VE:      /* PLL VE Control */
> > +    case REG_PLL_DDR:     /* PLL DDR Control */
> > +    case REG_PLL_PERIPH0: /* PLL Peripherals 0 Control */
> > +    case REG_PLL_GPU:     /* PLL GPU Control */
> > +    case REG_PLL_PERIPH1: /* PLL Peripherals 1 Control */
> > +    case REG_PLL_DE:      /* PLL Display Engine Control */
> > +        if (val & REG_PLL_ENABLE) {
> > +            val |= REG_PLL_LOCK;
> > +        }
> > +        break;
>
>         case 0x304 ... AW_H3_CCU_IOSIZE:
>             qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset
> 0x%04x\n",
>                           __func__, (uint32_t)offset);
>             break;
>

OK, looks more compact indeed.


>
> > +    default:
> > +        qemu_log_mask(LOG_UNIMP, "%s: unimplemented write offset
> 0x%04x\n",
> > +                      __func__, (uint32_t)offset);
> > +        break;
> > +    }
> > +
> > +    s->regs[idx] = (uint32_t) val;
> > +}
>
> That said,
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>

Thanks!

Niek


>
> > +
> > +static const MemoryRegionOps allwinner_h3_ccu_ops = {
> > +    .read = allwinner_h3_ccu_read,
> > +    .write = allwinner_h3_ccu_write,
> > +    .endianness = DEVICE_NATIVE_ENDIAN,
> > +    .valid = {
> > +        .min_access_size = 4,
> > +        .max_access_size = 4,
> > +    },
> > +    .impl.min_access_size = 4,
> > +};
> > +
> > +static void allwinner_h3_ccu_reset(DeviceState *dev)
> > +{
> > +    AwH3ClockCtlState *s = AW_H3_CCU(dev);
> > +
> > +    /* Set default values for registers */
> > +    s->regs[REG_INDEX(REG_PLL_CPUX)] = REG_PLL_CPUX_RST;
> > +    s->regs[REG_INDEX(REG_PLL_AUDIO)] = REG_PLL_AUDIO_RST;
> > +    s->regs[REG_INDEX(REG_PLL_VIDEO)] = REG_PLL_VIDEO_RST;
> > +    s->regs[REG_INDEX(REG_PLL_VE)] = REG_PLL_VE_RST;
> > +    s->regs[REG_INDEX(REG_PLL_DDR)] = REG_PLL_DDR_RST;
> > +    s->regs[REG_INDEX(REG_PLL_PERIPH0)] = REG_PLL_PERIPH0_RST;
> > +    s->regs[REG_INDEX(REG_PLL_GPU)] = REG_PLL_GPU_RST;
> > +    s->regs[REG_INDEX(REG_PLL_PERIPH1)] = REG_PLL_PERIPH1_RST;
> > +    s->regs[REG_INDEX(REG_PLL_DE)] = REG_PLL_DE_RST;
> > +    s->regs[REG_INDEX(REG_CPUX_AXI)] = REG_CPUX_AXI_RST;
> > +    s->regs[REG_INDEX(REG_APB1)] = REG_APB1_RST;
> > +    s->regs[REG_INDEX(REG_APB2)] = REG_APB2_RST;
> > +    s->regs[REG_INDEX(REG_DRAM_CFG)] = REG_DRAM_CFG_RST;
> > +    s->regs[REG_INDEX(REG_MBUS)] = REG_MBUS_RST;
> > +    s->regs[REG_INDEX(REG_PLL_TIME0)] = REG_PLL_TIME0_RST;
> > +    s->regs[REG_INDEX(REG_PLL_TIME1)] = REG_PLL_TIME1_RST;
> > +    s->regs[REG_INDEX(REG_PLL_CPUX_BIAS)] = REG_PLL_CPUX_BIAS_RST;
> > +    s->regs[REG_INDEX(REG_PLL_AUDIO_BIAS)] = REG_PLL_AUDIO_BIAS_RST;
> > +    s->regs[REG_INDEX(REG_PLL_VIDEO_BIAS)] = REG_PLL_VIDEO_BIAS_RST;
> > +    s->regs[REG_INDEX(REG_PLL_VE_BIAS)] = REG_PLL_VE_BIAS_RST;
> > +    s->regs[REG_INDEX(REG_PLL_DDR_BIAS)] = REG_PLL_DDR_BIAS_RST;
> > +    s->regs[REG_INDEX(REG_PLL_PERIPH0_BIAS)] = REG_PLL_PERIPH0_BIAS_RST;
> > +    s->regs[REG_INDEX(REG_PLL_GPU_BIAS)] = REG_PLL_GPU_BIAS_RST;
> > +    s->regs[REG_INDEX(REG_PLL_PERIPH1_BIAS)] = REG_PLL_PERIPH1_BIAS_RST;
> > +    s->regs[REG_INDEX(REG_PLL_DE_BIAS)] = REG_PLL_DE_BIAS_RST;
> > +    s->regs[REG_INDEX(REG_PLL_CPUX_TUNING)] = REG_PLL_CPUX_TUNING_RST;
> > +    s->regs[REG_INDEX(REG_PLL_DDR_TUNING)] = REG_PLL_DDR_TUNING_RST;
> > +}
> > +
> > +static void allwinner_h3_ccu_init(Object *obj)
> > +{
> > +    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
> > +    AwH3ClockCtlState *s = AW_H3_CCU(obj);
> > +
> > +    /* Memory mapping */
> > +    memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_h3_ccu_ops,
> s,
> > +                          TYPE_AW_H3_CCU, 1 * KiB);
> > +    sysbus_init_mmio(sbd, &s->iomem);
> > +}
> > +
> > +static const VMStateDescription allwinner_h3_ccu_vmstate = {
> > +    .name = "allwinner-h3-ccu",
> > +    .version_id = 1,
> > +    .minimum_version_id = 1,
> > +    .fields = (VMStateField[]) {
> > +        VMSTATE_UINT32_ARRAY(regs, AwH3ClockCtlState,
> AW_H3_CCU_REGS_NUM),
> > +        VMSTATE_END_OF_LIST()
> > +    }
> > +};
> > +
> > +static void allwinner_h3_ccu_class_init(ObjectClass *klass, void *data)
> > +{
> > +    DeviceClass *dc = DEVICE_CLASS(klass);
> > +
> > +    dc->reset = allwinner_h3_ccu_reset;
> > +    dc->vmsd = &allwinner_h3_ccu_vmstate;
> > +}
> > +
> > +static const TypeInfo allwinner_h3_ccu_info = {
> > +    .name          = TYPE_AW_H3_CCU,
> > +    .parent        = TYPE_SYS_BUS_DEVICE,
> > +    .instance_init = allwinner_h3_ccu_init,
> > +    .instance_size = sizeof(AwH3ClockCtlState),
> > +    .class_init    = allwinner_h3_ccu_class_init,
> > +};
> > +
> > +static void allwinner_h3_ccu_register(void)
> > +{
> > +    type_register_static(&allwinner_h3_ccu_info);
> > +}
> > +
> > +type_init(allwinner_h3_ccu_register)
> > diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
> > index da993f45b7..5e635b74d5 100644
> > --- a/hw/misc/Makefile.objs
> > +++ b/hw/misc/Makefile.objs
> > @@ -28,6 +28,7 @@ common-obj-$(CONFIG_MACIO) += macio/
> >
> >   common-obj-$(CONFIG_IVSHMEM_DEVICE) += ivshmem.o
> >
> > +common-obj-$(CONFIG_ALLWINNER_H3) += allwinner-h3-ccu.o
> >   common-obj-$(CONFIG_REALVIEW) += arm_sysctl.o
> >   common-obj-$(CONFIG_NSERIES) += cbus.o
> >   common-obj-$(CONFIG_ECCMEMCTL) += eccmemctl.o
> >
>
>

-- 
Niek Linnenbank

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