# SPDX-License-Identifier: GPL-2.0-only if ARCH_IXP4XX menu "Intel IXP4xx Implementation Options" comment "IXP4xx Platforms" config MACH_IXP4XX_OF bool prompt "Device Tree IXP4xx boards" default y select ARM_APPENDED_DTB # Old Redboot bootloaders deployed select I2C select I2C_IOP3XX select PCI select USE_OF help Say 'Y' here to support Device Tree-based IXP4xx platforms. config MACH_GATEWAY7001 bool "Gateway 7001" depends on IXP4XX_PCI_LEGACY help Say 'Y' here if you want your kernel to support Gateway's 7001 Access Point. For more information on this platform, see http://openwrt.org config MACH_GORAMO_MLR bool "GORAMO Multi Link Router" depends on IXP4XX_PCI_LEGACY help Say 'Y' here if you want your kernel to support GORAMO MultiLink router. config ARCH_PRPMC1100 bool "PrPMC1100" help Say 'Y' here if you want your kernel to support the Motorola PrPCM1100 Processor Mezanine Module. For more information on this platform, see . # # Certain registers and IRQs are only enabled if supporting IXP465 CPUs # config CPU_IXP46X bool depends on MACH_IXDP465 default y config CPU_IXP43X bool depends on MACH_KIXRP435 default y comment "IXP4xx Options" config IXP4XX_PCI_LEGACY bool "IXP4xx legacy PCI driver support" depends on PCI help Selects legacy PCI driver. Not recommended for new development. config IXP4XX_INDIRECT_PCI bool "Use indirect PCI memory access" depends on IXP4XX_PCI_LEGACY help IXP4xx provides two methods of accessing PCI memory space: 1) A direct mapped window from 0x48000000 to 0x4BFFFFFF (64MB). To access PCI via this space, we simply ioremap() the BAR into the kernel and we can use the standard read[bwl]/write[bwl] macros. This is the preferred method due to speed but it limits the system to just 64MB of PCI memory. This can be problematic if using video cards and other memory-heavy devices. 2) If > 64MB of memory space is required, the IXP4xx can be configured to use indirect registers to access the whole PCI memory space. This currently allows for up to 1 GB (0x10000000 to 0x4FFFFFFF) of memory on the bus. The disadvantage of this is that every PCI access requires three local register accesses plus a spinlock, but in some cases the performance hit is acceptable. In addition, you cannot mmap() PCI devices in this case due to the indirect nature of the PCI window. By default, the direct method is used. Choose this option if you need to use the indirect method instead. If you don't know what you need, leave this option unselected. endmenu endif