Messages in this thread | | | From | Arnd Bergmann <> | Date | Thu, 10 Mar 2022 12:51:00 +0100 | Subject | Re: [PATCH v3] arm64: dts: marvell: armada-37xx: Remap IO space to bus address 0x0 |
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On Thu, Mar 10, 2022 at 11:39 AM Pali Rohár <pali@kernel.org> wrote: > > Legacy and old PCI I/O based cards do not support 32-bit I/O addressing. > > Since commit 64f160e19e92 ("PCI: aardvark: Configure PCIe resources from > 'ranges' DT property") kernel can set different PCIe address on CPU and > different on the bus for the one A37xx address mapping without any firmware > support in case the bus address does not conflict with other A37xx mapping. > > So remap I/O space to the bus address 0x0 to enable support for old legacy > I/O port based cards which have hardcoded I/O ports in low address space. > > Note that DDR on A37xx is mapped to bus address 0x0. And mapping of I/O > space can be set to address 0x0 too because MEM space and I/O space are > separate and so do not conflict. > > Remapping IO space on Turris Mox to different address is not possible to > due bootloader bug. > > Signed-off-by: Pali Rohár <pali@kernel.org> > Reported-by: Arnd Bergmann <arnd@arndb.de> > Fixes: 76f6386b25cc ("arm64: dts: marvell: Add Aardvark PCIe support for Armada 3700") > Cc: stable@vger.kernel.org # 64f160e19e92 ("PCI: aardvark: Configure PCIe resources from 'ranges' DT property") > Cc: stable@vger.kernel.org # 514ef1e62d65 ("arm64: dts: marvell: armada-37xx: Extend PCIe MEM space")
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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