嵌入式Linux

开发平台：
Unix_Linux

arch.c：源码内容
							/*
 *  linux/arch/arm/kernel/arch.c
 *
 *  Architecture specific fixups.
 */
#include <linux/config.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <asm/elf.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/hardware/dec21285.h>
extern void genarch_init_irq(void);
unsigned int vram_size;
#ifdef CONFIG_ARCH_ACORN
unsigned int memc_ctrl_reg;
unsigned int number_mfm_drives;
static int __init parse_tag_acorn(const struct tag *tag)
{
	memc_ctrl_reg = tag->u.acorn.memc_control_reg;
	number_mfm_drives = tag->u.acorn.adfsdrives;
	switch (tag->u.acorn.vram_pages) {
	case 512:
		vram_size += PAGE_SIZE * 256;
	case 256:
		vram_size += PAGE_SIZE * 256;
	default:
		break;
	}
#if 0
	if (vram_size) {
		desc->video_start = 0x02000000;
		desc->video_end   = 0x02000000 + vram_size;
	}
#endif
	return 0;
}
__tagtable(ATAG_ACORN, parse_tag_acorn);
#ifdef CONFIG_ARCH_RPC
static void __init
fixup_riscpc(struct machine_desc *desc, struct param_struct *unusd,
	    char **cmdline, struct meminfo *mi)
{
	/*
	 * RiscPC can't handle half-word loads and stores
	 */
	elf_hwcap &= ~HWCAP_HALF;
}
extern void __init rpc_map_io(void);
MACHINE_START(RISCPC, "Acorn-RiscPC")
	MAINTAINER("Russell King")
	BOOT_MEM(0x10000000, 0x03000000, 0xe0000000)
	BOOT_PARAMS(0x10000100)
	DISABLE_PARPORT(0)
	DISABLE_PARPORT(1)
	FIXUP(fixup_riscpc)
	MAPIO(rpc_map_io)
	INITIRQ(genarch_init_irq)
MACHINE_END
#endif
#ifdef CONFIG_ARCH_ARC
MACHINE_START(ARCHIMEDES, "Acorn-Archimedes")
	MAINTAINER("Dave Gilbert")
	BOOT_PARAMS(0x0207c000)
	INITIRQ(genarch_init_irq)
MACHINE_END
#endif
#ifdef CONFIG_ARCH_A5K
MACHINE_START(A5K, "Acorn-A5000")
	MAINTAINER("Russell King")
	BOOT_PARAMS(0x0207c000)
	INITIRQ(genarch_init_irq)
MACHINE_END
#endif
#endif
#ifdef CONFIG_ARCH_L7200
extern void __init l7200_map_io(void);
static void __init
fixup_l7200(struct machine_desc *desc, struct param_struct *unused,
             char **cmdline, struct meminfo *mi)
{
        mi->nr_banks      = 1;
        mi->bank[0].start = PHYS_OFFSET;
        mi->bank[0].size  = (32*1024*1024);
        mi->bank[0].node  = 0;
        ROOT_DEV = MKDEV(RAMDISK_MAJOR,0);
        setup_ramdisk( 1, 0, 0, CONFIG_BLK_DEV_RAM_SIZE);
        setup_initrd( __phys_to_virt(0xf1000000), 0x005dac7b);
        /* Serial Console COM2 and LCD */
	strcpy( *cmdline, "console=tty0 console=ttyLU1,115200");
        /* Serial Console COM1 and LCD */
	//strcpy( *cmdline, "console=tty0 console=ttyLU0,115200");
        /* Console on LCD */
	//strcpy( *cmdline, "console=tty0");
}
MACHINE_START(L7200, "LinkUp Systems L7200")
	MAINTAINER("Steve Hill / Scott McConnell")
	BOOT_MEM(0xf0000000, 0x80040000, 0xd0000000)
	FIXUP(fixup_l7200)
	MAPIO(l7200_map_io)
	INITIRQ(genarch_init_irq)
MACHINE_END
#endif
#ifdef CONFIG_ARCH_NEXUSPCI
extern void __init nexuspci_map_io(void);
MACHINE_START(NEXUSPCI, "FTV/PCI")
	MAINTAINER("Philip Blundell")
	BOOT_MEM(0x40000000, 0x10000000, 0xe0000000)
	MAPIO(nexuspci_map_io)
	INITIRQ(genarch_init_irq)
MACHINE_END
#endif
#ifdef CONFIG_ARCH_TBOX
extern void __init tbox_map_io(void);
MACHINE_START(TBOX, "unknown-TBOX")
	MAINTAINER("Philip Blundell")
	BOOT_MEM(0x80000000, 0x00400000, 0xe0000000)
	MAPIO(tbox_map_io)
	INITIRQ(genarch_init_irq)
MACHINE_END
#endif
#ifdef CONFIG_ARCH_CLPS7110
MACHINE_START(CLPS7110, "CL-PS7110")
	MAINTAINER("Werner Almesberger")
	INITIRQ(genarch_init_irq)
MACHINE_END
#endif
#ifdef CONFIG_ARCH_ETOILE
MACHINE_START(ETOILE, "Etoile")
	MAINTAINER("Alex de Vries")
	INITIRQ(genarch_init_irq)
MACHINE_END
#endif
#ifdef CONFIG_ARCH_LACIE_NAS
MACHINE_START(LACIE_NAS, "LaCie_NAS")
	MAINTAINER("Benjamin Herrenschmidt")
	INITIRQ(genarch_init_irq)
MACHINE_END
#endif
#ifdef CONFIG_ARCH_CLPS7500
extern void __init clps7500_map_io(void);
MACHINE_START(CLPS7500, "CL-PS7500")
	MAINTAINER("Philip Blundell")
	BOOT_MEM(0x10000000, 0x03000000, 0xe0000000)
	MAPIO(clps7500_map_io)
	INITIRQ(genarch_init_irq)
MACHINE_END
#endif

						