Re: [Qemu-devel] [PATCHv2 3/4] Allow ISA bus to be configured out

[Michael S. Tsirkin]

On Thu, Jul 02, 2015 at 03:53:46PM +1000, David Gibson wrote:
> Currently, the code to handle the legacy ISA bus is always included in
> qemu.  However there are lots of platforms that don't include ISA legacy
> devies, and quite a few that have never used ISA legacy devices at all.
> 
> This patch allows the ISA bus code to be disabled in the configuration for
> platforms where it doesn't make sense.
> 
> For now, the default configs are adjusted to include ISA on all platforms
> including PCI: anything with PCI can at least in principle add an i82378
> PCI->ISA bridge.

That would be a config bug, won't it?
Don't enable CONFIG_I82378 unless you want ISA.


>  Also, CONFIG_IDE_CORE which is already in pci.mak
> requires ISA support.

Ugh that's ugly. We really need to express dependencies between config
options, long term.
Until we support this, how about a comment to document why is ISA pulled in by
pci.mak?

> 
> We also explicitly enable ISA on some other non-PCI platforms which include
> ISA devices.  We may want to pare this down in future.
> 
> Signed-off-by: David Gibson <address@hidden>

Only a comment requested so

Acked-by: Michael S. Tsirkin <address@hidden>


> ---
>  default-configs/moxie-softmmu.mak     | 1 +
>  default-configs/pci.mak               | 1 +
>  default-configs/sparc-softmmu.mak     | 1 +
>  default-configs/unicore32-softmmu.mak | 1 +
>  hw/isa/Makefile.objs                  | 2 +-
>  5 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/default-configs/moxie-softmmu.mak 
> b/default-configs/moxie-softmmu.mak
> index 1a95476..3886275 100644
> --- a/default-configs/moxie-softmmu.mak
> +++ b/default-configs/moxie-softmmu.mak
> @@ -1,5 +1,6 @@
>  # Default configuration for moxie-softmmu
>  
> +CONFIG_ISA_BUS=y
>  CONFIG_MC146818RTC=y
>  CONFIG_SERIAL=y
>  CONFIG_VGA=y
> diff --git a/default-configs/pci.mak b/default-configs/pci.mak
> index 7e10903..9f2b98c 100644
> --- a/default-configs/pci.mak
> +++ b/default-configs/pci.mak
> @@ -1,4 +1,5 @@
>  CONFIG_PCI=y
> +CONFIG_ISA_BUS=y
>  CONFIG_VIRTIO_PCI=y
>  CONFIG_VIRTIO=y
>  CONFIG_USB_UHCI=y
> diff --git a/default-configs/sparc-softmmu.mak 
> b/default-configs/sparc-softmmu.mak
> index ab796b3..004b0f4 100644
> --- a/default-configs/sparc-softmmu.mak
> +++ b/default-configs/sparc-softmmu.mak
> @@ -1,5 +1,6 @@
>  # Default configuration for sparc-softmmu
>  
> +CONFIG_ISA_BUS=y
>  CONFIG_ECC=y
>  CONFIG_ESP=y
>  CONFIG_ESCC=y
> diff --git a/default-configs/unicore32-softmmu.mak 
> b/default-configs/unicore32-softmmu.mak
> index de38577..5f6c4a8 100644
> --- a/default-configs/unicore32-softmmu.mak
> +++ b/default-configs/unicore32-softmmu.mak
> @@ -1,4 +1,5 @@
>  # Default configuration for unicore32-softmmu
> +CONFIG_ISA_BUS=y
>  CONFIG_PUV3=y
>  CONFIG_PTIMER=y
>  CONFIG_PCKBD=y
> diff --git a/hw/isa/Makefile.objs b/hw/isa/Makefile.objs
> index 9164556..fb37c55 100644
> --- a/hw/isa/Makefile.objs
> +++ b/hw/isa/Makefile.objs
> @@ -1,4 +1,4 @@
> -common-obj-y += isa-bus.o
> +common-obj-$(CONFIG_ISA_BUS) += isa-bus.o
>  common-obj-$(CONFIG_APM) += apm.o
>  common-obj-$(CONFIG_I82378) += i82378.o
>  common-obj-$(CONFIG_PC87312) += pc87312.o
> -- 
> 2.4.3