Re: how to build QEMU with the peripheral device modules

[casmac]

Hi ,

  Thanks for the hints. I get better understanding to the kconfig tool now.

  I added "select  TI_DMA" in my DSP kconfig file. It is done.

best regards,

xiaolei

------------------ Original ------------------

From: "Philippe Mathieu-Daudé"<philmd@redhat.com>;

Date: Fri, Jun 19, 2020 10:59 PM

To: "casmac"<climber.cui@qq.com>;"qemu-devel"<qemu-devel@nongnu.org>;

Subject: Re: how to build QEMU with the peripheral device modules

Hi,

On 6/19/20 3:24 PM, casmac wrote:
> Hi All,
>    I am trying to add a DMA peripheral module. In hw/dma directory, a
> file  ti_dma.c is added.
>    Also, in hw/dma/kconfig, I added the following lines:
> config TI_DMA
> bool

You need some device that 'selects' your device.

You can select it by default:

  config TI_DMA
      bool
      default y

You can enforce the selection on a target. For example to add it
to all the ARM machines, in default-configs/arm-softmmu.mak add:

CONFIG_TI_DMA=y

The best is to only select it when required. For example if you
need it on all machines using a TI OMAP SoC, then you'd select it
in the OMAP section of hw/arm/Kconfig:

  config OMAP
      bool
      select FRAMEBUFFER
      select I2C
      select ECC
      select NAND
      select PFLASH_CFI01
      select SD
      select SERIAL
      select TI_DMA

You should have enough to adapt to your needs.

Regards,

Phil.

>    In hw/dma/makefile.ojb, added one line:
> common-obj-$(CONFIG_TI_DMA) += ti_dma.o
>    However, ti_dma.c is not compiled as the QEMU project is built. Some
> directories(eg. block, cpu...) under hw will be compiled though. 
>    The makefile.obj seems to show that the DMA module would be built
> along with  others:
> devices-dirs-y = core/
> ifeq ($(CONFIG_SOFTMMU), y)
> devices-dirs-$(call lor,$(CONFIG_VIRTIO_9P),$(call
> land,$(CONFIG_VIRTFS),$(CONFIG_XEN))) += 9pfs/
> devices-dirs-y += acpi/
> devices-dirs-y += adc/
> devices-dirs-y += audio/
> devices-dirs-y += block/
> devices-dirs-y += bt/
> devices-dirs-y += char/
> devices-dirs-y += cpu/
> devices-dirs-y += display/
> devices-dirs-y += dma/
> devices-dirs-y += gpio/
> ......
>     I am not sure what is missing here. Any advise would be appreciated.
> Thanks.
>
> xiaolei