From da844a81779e2bb263eca4ecb1046541fdb11cf8 Mon Sep 17 00:00:00 2001 From: Max Filippov Date: Sun, 4 Nov 2012 00:30:13 +0400 Subject: xtensa: add device trees support Device trees allow specification of hardware topology and device parameters at runtime instead of hard-coding them in platform setup code. This allows running single binary kernel on a range of compatible boards. New boot parameters tag BP_TAG_FDT is allocated and a pointer to flat device tree is passed in it. Note that current interrupt mapping scheme uses single cell for interrupt identification. That means that IRQ numbers used in DTS must be CPU internal IRQ numbers, not external. It is possible to extend interrupt identification to two cells, and use second cell to tell external IRQ numbers form internal. That would allow to use single DTS on multiple boards with different mapping of external IRQ numbers. Signed-off-by: Max Filippov Signed-off-by: Chris Zankel --- arch/xtensa/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'arch/xtensa/Kconfig') diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 1816abc5c8d5..8ceb5b2ffbb1 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -178,6 +178,17 @@ config CMDLINE time by entering them here. As a minimum, you should specify the memory size and the root device (e.g., mem=64M root=/dev/nfs). +config USE_OF + bool "Flattened Device Tree support" + select OF + select OF_EARLY_FLATTREE + help + Include support for flattened device tree machine descriptions. + +config BUILTIN_DTB + string "DTB to build into the kernel image" + depends on OF + source "mm/Kconfig" source "drivers/pcmcia/Kconfig" -- cgit v1.2.3