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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>
Cc: Jacob Pan <jacob.jun.pan@intel.com>
This commit is contained in:
Thomas Gleixner 2009-08-29 14:54:20 +02:00
parent 162bc7ab01
commit 3f4110a48a
5 changed files with 47 additions and 0 deletions
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13
arch/x86/Kconfig
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@ -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

6
arch/x86/include/asm/setup.h
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@ -49,6 +49,12 @@ extern void reserve_standard_io_resources(void);
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
/*

1
arch/x86/kernel/Makefile
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@ -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

3
arch/x86/kernel/head32.c
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@ -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;

24
arch/x86/kernel/mrst.c Normal file
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@ -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;
}