4c5107e445
This splits off a 'pci-new.c' which is aimed at gradually replacing the pci-auto backend and the arch/sh/drivers/pci/pci.c core respectively. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
43 lines
1.4 KiB
Text
43 lines
1.4 KiB
Text
config PCI
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bool "PCI support"
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depends on SYS_SUPPORTS_PCI
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help
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Find out whether you have a PCI motherboard. PCI is the name of a
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bus system, i.e. the way the CPU talks to the other stuff inside
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your box. If you have PCI, say Y, otherwise N.
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config SH_PCIDMA_NONCOHERENT
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bool "Cache and PCI noncoherent"
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depends on PCI
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default y
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help
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Enable this option if your platform does not have a CPU cache which
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remains coherent with PCI DMA. It is safest to say 'Y', although you
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will see better performance if you can say 'N', because the PCI DMA
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code will not have to flush the CPU's caches. If you have a PCI host
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bridge integrated with your SH CPU, refer carefully to the chip specs
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to see if you can say 'N' here. Otherwise, leave it as 'Y'.
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# Temporary config option for transitioning off of PCI_AUTO
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config PCI_NEW
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bool
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depends on PCI
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default y if CPU_SUBTYPE_SH7763 || CPU_SUBTYPE_SH7780 || \
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CPU_SUBTYPE_SH7785
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# This is also board-specific
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config PCI_AUTO
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bool
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depends on PCI && !PCI_NEW
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default y
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config PCI_AUTO_UPDATE_RESOURCES
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bool
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depends on PCI_AUTO
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default y if !SH_DREAMCAST
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help
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Selecting this option will cause the PCI auto code to leave your
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BAR values alone. Otherwise they will be updated automatically. If
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for some reason, you have a board that simply refuses to work
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with its resources updated beyond what they are when the device
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is powered up, set this to N. Everyone else will want this as Y.
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