Re: [Qemu-devel] [PATCH 2/4] Allow ISA bus to be configured out

["Andreas Färber" <afaerber@suse.de>]

Am 29.06.2015 um 07:36 schrieb David Gibson:
> 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 (since
> CONFIG_IDE_CORE which is in pci.mak requires ISA support) and also several
> others which include ISA devices.  We may want to pare this down in future.

PCI also allows to have a PCI-ISA bridge such as the i82378, which means
that all PCI platforms can potentially obtain an actual ISA bus. So at
least the commit message could use a makeover to avoid someone touching
IDE to blindly disable the dependency.

You'd also need to think about the qtests then:

$ git grep i82378 -- tests/
tests/endianness-test.c:    { "ppc", "g3beige", 0xfe000000, .bswap =
true, .superio = "i82378" },
tests/endianness-test.c:    { "ppc", "bamboo", 0xe8000000, .bswap =
true, .superio = "i82378" },
tests/endianness-test.c:    { "ppc64", "mac99", 0xf2000000, .bswap =
true, .superio = "i82378" },
tests/endianness-test.c:      .bswap = true, .superio = "i82378" },
tests/endianness-test.c:    { "sh4", "r2d", 0xfe240000, .superio =
"i82378" },
tests/endianness-test.c:    { "sh4eb", "r2d", 0xfe240000, .bswap = true,
.superio = "i82378" },

> 
> This patch becomes more useful since b19c1c0 "isa: remove isa_mem_base
> variable." since that removes a dependency on isa-bus.c from vga.c.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
>  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 7e22863..e00d099 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_SERIAL_ISA=y

I guess we can drop it for moxie ...

> 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

... and for unicore32?

Regards,
Andreas

> 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

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