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Subject[patch 3/3] x86: Add Moorestown early detection
Moorestown MID devices need to be detected early in the boot process
to setup and do not call x86_default_early_setup as there is no EBDA
region to reserve.

[ Copied the minimal code from Jacobs latest MRST series ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/Kconfig | 13 +++++++++++++
arch/x86/include/asm/setup.h | 6 ++++++
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/head32.c | 3 +++
arch/x86/kernel/mrst.c | 24 ++++++++++++++++++++++++
5 files changed, 47 insertions(+)
Index: linux-2.6-tip/arch/x86/Kconfig
===================================================================
--- linux-2.6-tip.orig/arch/x86/Kconfig
+++ linux-2.6-tip/arch/x86/Kconfig
@@ -318,6 +318,7 @@ config X86_EXTENDED_PLATFORM
SGI 320/540 (Visual Workstation)
Summit/EXA (IBM x440)
Unisys ES7000 IA32 series
+ Moorestown MID devices

If you have one of these systems, or if you want to build a
generic distribution kernel, say Y here - otherwise say N.
@@ -377,6 +378,18 @@ config X86_ELAN

If unsure, choose "PC-compatible" instead.

+config X86_MRST
+ bool "Moorestown MID platform"
+ depends on X86_32
+ depends on X86_EXTENDED_PLATFORM
+ ---help---
+ Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
+ Internet Device(MID) platform. Moorestown consists of two chips:
+ Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
+ Unlike standard x86 PCs, Moorestown does not have many legacy devices
+ nor standard legacy replacement devices/features. e.g. Moorestown does
+ not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
+
config X86_RDC321X
bool "RDC R-321x SoC"
depends on X86_32
Index: linux-2.6-tip/arch/x86/include/asm/setup.h
===================================================================
--- linux-2.6-tip.orig/arch/x86/include/asm/setup.h
+++ linux-2.6-tip/arch/x86/include/asm/setup.h
@@ -49,6 +49,12 @@ extern void reserve_standard_io_resource
extern void i386_reserve_resources(void);
extern void setup_default_timer_irq(void);

+#ifdef CONFIG_X86_MRST
+extern void x86_mrst_early_setup(void);
+#else
+static inline void x86_mrst_early_setup(void) { }
+#endif
+
#ifndef _SETUP

/*
Index: linux-2.6-tip/arch/x86/kernel/Makefile
===================================================================
--- linux-2.6-tip.orig/arch/x86/kernel/Makefile
+++ linux-2.6-tip/arch/x86/kernel/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_SCx200) += scx200.o
scx200-y += scx200_32.o

obj-$(CONFIG_OLPC) += olpc.o
+obj-$(CONFIG_X86_MRST) += mrst.o

microcode-y := microcode_core.o
microcode-$(CONFIG_MICROCODE_INTEL) += microcode_intel.o
Index: linux-2.6-tip/arch/x86/kernel/head32.c
===================================================================
--- linux-2.6-tip.orig/arch/x86/kernel/head32.c
+++ linux-2.6-tip/arch/x86/kernel/head32.c
@@ -45,6 +45,9 @@ void __init i386_start_kernel(void)

/* Call the subarch specific early setup function */
switch (boot_params.hdr.hardware_subarch) {
+ case X86_SUBARCH_MRST:
+ x86_mrst_early_setup();
+ break;
default:
i386_default_early_setup();
break;
Index: linux-2.6-tip/arch/x86/kernel/mrst.c
===================================================================
--- /dev/null
+++ linux-2.6-tip/arch/x86/kernel/mrst.c
@@ -0,0 +1,24 @@
+/*
+ * mrst.c: Intel Moorestown platform specific setup code
+ *
+ * (C) Copyright 2008 Intel Corporation
+ * Author: Jacob Pan (jacob.jun.pan@intel.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+#include <linux/init.h>
+
+#include <asm/setup.h>
+
+/*
+ * Moorestown specific x86_init function overrides and early setup
+ * calls.
+ */
+void __init x86_mrst_early_setup(void)
+{
+ x86_init.resources.probe_roms = x86_init_noop;
+ x86_init.resources.reserve_resources = x86_init_noop;
+}



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