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authorLinus Torvalds <torvalds@linux-foundation.org>2011-03-15 20:01:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-15 20:01:36 -0700
commitd10902812c9cd5583130a4ebb9ad19c60b68149d (patch)
treeb1b28587970e8cebf74ba4d61edf49537f619ab7 /Documentation/devicetree/booting-without-of.txt
parent181f977d134a9f8e3f8839f42af655b045fc059e (diff)
parent25874a299ef8037df03ce4ada570bc4e42f9748f (diff)
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Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (27 commits) x86: Clean up apic.c and apic.h x86: Remove superflous goal definition of tsc_sync x86: dt: Correct local apic documentation in device tree bindings x86: dt: Cleanup local apic setup x86: dt: Fix OLPC=y/INTEL_CE=n build rtc: cmos: Add OF bindings x86: ce4100: Use OF to setup devices x86: ioapic: Add OF bindings for IO_APIC x86: dtb: Add generic bus probe x86: dtb: Add support for PCI devices backed by dtb nodes x86: dtb: Add device tree support for HPET x86: dtb: Add early parsing of IO_APIC x86: dtb: Add irq domain abstraction x86: dtb: Add a device tree for CE4100 x86: Add device tree support x86: e820: Remove conditional early mapping in parse_e820_ext x86: OLPC: Make OLPC=n build again x86: OLPC: Remove extra OLPC_OPENFIRMWARE_DT indirection x86: OLPC: Cleanup config maze completely x86: OLPC: Hide OLPC_OPENFIRMWARE config switch ... Fix up conflicts in arch/x86/platform/ce4100/ce4100.c
Diffstat (limited to 'Documentation/devicetree/booting-without-of.txt')
-rw-r--r--Documentation/devicetree/booting-without-of.txt20
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/devicetree/booting-without-of.txt b/Documentation/devicetree/booting-without-of.txt
index 28b1c9d..55fd262 100644
--- a/Documentation/devicetree/booting-without-of.txt
+++ b/Documentation/devicetree/booting-without-of.txt
@@ -13,6 +13,7 @@ Table of Contents
I - Introduction
1) Entry point for arch/powerpc
+ 2) Entry point for arch/x86
II - The DT block format
1) Header
@@ -225,6 +226,25 @@ it with special cases.
cannot support both configurations with Book E and configurations
with classic Powerpc architectures.
+2) Entry point for arch/x86
+-------------------------------
+
+ There is one single 32bit entry point to the kernel at code32_start,
+ the decompressor (the real mode entry point goes to the same 32bit
+ entry point once it switched into protected mode). That entry point
+ supports one calling convention which is documented in
+ Documentation/x86/boot.txt
+ The physical pointer to the device-tree block (defined in chapter II)
+ is passed via setup_data which requires at least boot protocol 2.09.
+ The type filed is defined as
+
+ #define SETUP_DTB 2
+
+ This device-tree is used as an extension to the "boot page". As such it
+ does not parse / consider data which is already covered by the boot
+ page. This includes memory size, reserved ranges, command line arguments
+ or initrd address. It simply holds information which can not be retrieved
+ otherwise like interrupt routing or a list of devices behind an I2C bus.
II - The DT block format
========================
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