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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2011-02-22 21:07:37 +0100
committerThomas Gleixner <tglx@linutronix.de>2011-02-23 22:27:52 +0100
commitda6b737b9ab768dd06bb4b0395131d10e524cf83 (patch)
tree5ae44f22f3be802f2a9d3c09fd068f394efbd0a6 /arch/x86/kernel/setup.c
parentf1c2b357148ec27fcc6ce0992211209a0ea20d8f (diff)
x86: Add device tree support
This patch adds minimal support for device tree on x86. The device tree blob is passed to the kernel via setup_data which requires at least boot protocol 2.09. Memory size, restricted memory regions, boot arguments are gathered the traditional way so things like cmd_line are just here to let the code compile. The current plan is use the device tree as an extension and to gather information which can not be enumerated and would have to be hardcoded otherwise. This includes things like - which devices are on this I2C/SPI bus? - how are the interrupts wired to IO APIC? - where could my hpet be? Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Cc: sodaville@linutronix.de Cc: devicetree-discuss@lists.ozlabs.org LKML-Reference: <1298405266-1624-3-git-send-email-bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/setup.c')
-rw-r--r--arch/x86/kernel/setup.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 9521483ce58..33dcbce1ab0 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -113,6 +113,7 @@
#endif
#include <asm/mce.h>
#include <asm/alternative.h>
+#include <asm/prom.h>
/*
* end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
@@ -445,6 +446,9 @@ static void __init parse_setup_data(void)
case SETUP_E820_EXT:
parse_e820_ext(data);
break;
+ case SETUP_DTB:
+ add_dtb(pa_data);
+ break;
default:
break;
}