kernel(三):kernel移植

? ? ? ? 本文主要探讨210官方kernel移植。

配置文件选择

?? ?选择配置文件smdkv210_android_defconfig(arch/arm/configs)

修改主Makefile

?? ?配置cpu架构和交叉编译工具链

?? ?vim Makefile

?? ?ARCH ? ? ? ? ? ??= arm
?? ?CROSS_COMPILE ? ?= /root/arm-2009q3/bin/arm-none-linux-gnueabi-

初步编译烧录

ubuntu:

?? ?make smdkv210_android_defconfig
?? ?
?? ?make -j4

?? ?cp -r arch/arm/boot/zImage ~/tftp/



uboot：

?? ?tftp 30008000 zImage

?? ?bootm 30008000

????????结果显示(无法启动)：?

一阶段移植(head.s)

? ? ? ? 初步移植未有kernel信息打印则说明一阶段(汇编)异常

? ? ? ? led调试一阶段，添加led熄灭代码逐步测试(初始led亮)

????????led亮且未显示解压zImage信息则解压部分异常(实际为物理地址错误)

vim arch/arm/kernel/head.s

/*
 * Kernel startup entry point.
 * ---------------------------
 *
 * This is normally called from the decompressor code.  The requirements
 * are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0,
 * r1 = machine nr, r2 = atags pointer.
 *
 * This code is mostly position independent, so if you link the kernel at
 * 0xc0008000, you call this at __pa(0xc0008000).
 *
 * See linux/arch/arm/tools/mach-types for the complete list of machine
 * numbers for r1.
 *
 * We're trying to keep crap to a minimum; DO NOT add any machine specific
 * crap here - that's what the boot loader (or in extreme, well justified
 * circumstances, zImage) is for.
 */
        __HEAD
ENTRY(stext)
        setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9 @ ensure svc mode

        //test 
        bl led_off
                                                @ and irqs disabled
        mrc     p15, 0, r9, c0, c0              @ get processor id
        bl      __lookup_processor_type         @ r5=procinfo r9=cpuid
        movs    r10, r5                         @ invalid processor (r5=0)?
        beq     __error_p                       @ yes, error 'p'
        bl      __lookup_machine_type           @ r5=machinfo
        movs    r8, r5                          @ invalid machine (r5=0)?
        beq     __error_a                       @ yes, error 'a'
        bl      __vet_atags
        bl      __create_page_tables

        /*
         * The following calls CPU specific code in a position independent
         * manner.  See arch/arm/mm/proc-*.S for details.  r10 = base of
         * xxx_proc_info structure selected by __lookup_machine_type
         * above.  On return, the CPU will be ready for the MMU to be
         * turned on, and r0 will hold the CPU control register value.
         */
        ldr     r13, __switch_data              @ address to jump to after
                                                @ mmu has been enabled
        adr     lr, BSYM(__enable_mmu)          @ return (PIC) address
         ARM(   add     pc, r10, #PROCINFO_INITFUNC     )
         THUMB( add     r12, r10, #PROCINFO_INITFUNC    )
         THUMB( mov     pc, r12                         )
ENDPROC(stext)





//led off

led_off:
        ldr r3, =0x11111111
        ldr r4, = 0xE0200240
        str r3, [r4]

        ldr r3, =0xff
        ldr r4, =0xE0200244
        str r3, [r4]

        mov pc, lr

? ? ? ? 修改物理地址

#define KERNEL_RAM_VADDR	(PAGE_OFFSET + TEXT_OFFSET)
#define KERNEL_RAM_PADDR	(PHYS_OFFSET + TEXT_OFFSET)

(arch/arm/include/asm/memory.h)#define PAGE_OFFSET        UL(CONFIG_PAGE_OFFSET)
(.config)CONFIG_PAGE_OFFSET=0xC0000000


修改为

(arch/arm/mach-s5pv210/include/mach/memory.h)
#if defined(CONFIG_MACH_SMDKV210)
#define PHYS_OFFSET             UL(0x30000000)
#else
#define PHYS_OFFSET             UL(0x30000000)
#endif

????????修改解压地址
?

vim ?arch/arm/mach-spv210/Makefile.boot

# override for SMDKV210
zreladdr-$(CONFIG_MACH_SMDKV210)?? ?:= 0x30008000
params_phys-$(CONFIG_MACH_SMDKV210)?? ?:= 0x30000100

?

????????内核机器码确定分析
?? ?????????MACHINE_START宏定义机器码数据结构(硬件信息及其相关初始化函数等)
?? ?????????每个mach-xxx.c文件定义一个机器码machine_desc结构体变量且结构体变量被定义到段(.arch.info.init)?? ?

(arch/arm/mach-s5pv210/s5pc110.c)
?? ?#ifdef CONFIG_MACH_SMDKC110
?? ?MACHINE_START(SMDKC110, "SMDKC110")
?? ?#elif CONFIG_MACH_SMDKV210
?? ?MACHINE_START(SMDKV210, "SMDKV210")
?? ?#endif
?? ?/* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
?? ?.phys_io?? ?= S3C_PA_UART & 0xfff00000,
?? ?.io_pg_offst?? ?= (((u32)S3C_VA_UART) >> 18) & 0xfffc,
?? ?.boot_params?? ?= S5P_PA_SDRAM + 0x100,
?? ?.init_irq?? ?= s5pv210_init_irq,
?? ?.map_io?? ??? ?= smdkc110_map_io,
?? ?.init_machine?? ?= smdkc110_machine_init,
?? ?.timer?? ??? ?= &s5p_systimer,
?? ?MACHINE_END


?? ?(.config)
?? ?CONFIG_MACH_SMDKV210=y
?? ?# CONFIG_MACH_SMDKC110 is not set


?? ?(arch/arm/include/asm/mach/arch.h)
?? ?#define MACHINE_START(_type,_name)?? ??? ??? ?\
?? ?static const struct machine_desc __mach_desc_##_type?? ?\
??? ?__used?? ??? ??? ??? ??? ??? ??? ?\
??? ?__attribute__((__section__(".arch.info.init"))) = {?? ?\
?? ??? ?.nr?? ??? ?= MACH_TYPE_##_type,?? ??? ?\
?? ??? ?.name?? ??? ?= _name,

?? ?#define MACHINE_END?? ??? ??? ??? ?\
};


推导出()：
static const struct machine_desc __mach_desc_SMDKV210?? ?\
?__used?? ??? ??? ??? ??? ??? ??? ?\
?__attribute__((__section__(".arch.info.init"))) = {?? ?\
?? ?.nr?? ??? ?= MACH_TYPE_SMDKV210,?? ??? ?\
?? ?.name?? ??? ?= "SMDKV210",
?? ?.phys_io?? ?= S3C_PA_UART & 0xfff00000,
?? ?.io_pg_offst?? ?= (((u32)S3C_VA_UART) >> 18) & 0xfffc,
?? ?.boot_params?? ?= S5P_PA_SDRAM + 0x100,
?? ?.init_irq?? ?= s5pv210_init_irq,
?? ?.map_io?? ??? ?= smdkv210_map_io,
?? ?.init_machine?? ?= smdkv210_machine_init,
?? ?.timer?? ??? ?= &s5p_systimer,
};

二阶段?

????????修改电源异常

????????????????程序在dev_driver_string或max8698_pmic_probe异常
????????????????max8698_pmic_probe为电源管理IC驱动安装函数,210未使用电源IC

????????????????make menuconfig取消max8698编译进内核

? ? ? ? 修改网卡异常

? ? ?????????????????修改网卡寄存器配置(移植mach-x210.c)
?? ?

smdkc110_machine_init==>smdkc110_dm9000_set

#ifdef CONFIG_DM9000
static void __init smdkc110_dm9000_set(void)
{
? ? ? ? unsigned int tmp;

? ? ? ? s3c_gpio_cfgpin(S5PV210_GPH1(2), S3C_GPIO_INPUT);
? ? ? ? s3c_gpio_setpull(S5PV210_GPH1(2), S3C_GPIO_PULL_NONE);

? ? ? ? int ret = gpio_request(S5PV210_GPH1(2), "GPH1");
? ? ? ? if(ret)
? ? ? ? ? ? ? ? printk("mach-x210: request gpio GPH1(2) fail");
? ? ? ? else
? ? ? ? {
? ? ? ? ? ? ? ? s3c_gpio_cfgpin(S5PV210_GPH1(2), 0xf);
? ? ? ? ? ? ? ? s3c_gpio_setpull(S5PV210_GPH1(2), S3C_GPIO_PULL_NONE);
? ? ? ? }
? ? ? ? tmp = ((0<<28)|(0<<24)|(5<<16)|(0<<12)|(0<<8)|(0<<4)|(0<<0));
? ? ? ? __raw_writel(tmp, S5P_SROM_BC1);

? ? ? ? tmp = __raw_readl(S5P_SROM_BW);
? ? ? ? tmp &= ~(0xf << 4);
? ? ? ? tmp |= (1<<7) | (1<<6) | (1<<5) | (1<<4); // dm9000 16bit
? ? ? ? __raw_writel(tmp, S5P_SROM_BW);

? ? ? ? tmp = __raw_readl(S5PV210_MP01CON);
? ? ? ? tmp &= ~(0xf << 4);
? ? ? ? tmp |= (2 << 4);

? ? ? ? __raw_writel(tmp, S5PV210_MP01CON);
}

????????????????????????修改网卡地址和中断号(arch/arm/plat-s5p/devs.c)

/* DM9000 registrations */
#ifdef CONFIG_DM9000
static struct resource s5p_dm9000_resources[] = {
?? ?[0] = {
?? ??? ?.start = S5P_PA_DM9000,
?? ??? ?.end ? = S5P_PA_DM9000,
?? ??? ?.flags = IORESOURCE_MEM,
?? ?},
?? ?[1] = {
#if defined(CONFIG_DM9000_16BIT)
?? ??? ?//.start = S5P_PA_DM9000 + 2,
?? ??? ?//.end ? = S5P_PA_DM9000 + 2,
?? ??? ?.start = S5P_PA_DM9000 + 4,
?? ??? ?.end ? = S5P_PA_DM9000 + 4,
?? ??? ?.flags = IORESOURCE_MEM,
#else
?? ??? ?.start = S5P_PA_DM9000 + 1,
?? ??? ?.end ? = S5P_PA_DM9000 + 1,
?? ??? ?.flags = IORESOURCE_MEM,
#endif
?? ?},
?? ?[2] = {
?? ??? ?//.start = IRQ_EINT9,
?? ??? ?//.end ? = IRQ_EINT9,
?? ??? ?.start = IRQ_EINT10,
?? ??? ?.end ? = IRQ_EINT10,
?? ??? ?.flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHLEVEL,
?? ?}
};


依据

struct platform_device s5p_device_dm9000 = {
?? ?.name?? ??? ?= "dm9000",
?? ?.id?? ??? ?= ?0,
?? ?.num_resources?? ?= ARRAY_SIZE(s5p_dm9000_resources),
?? ?.resource?? ?= s5p_dm9000_resources,
?? ?.dev?? ??? ?= {
?? ??? ?.platform_data = &s5p_dm9000_platdata,
?? ?}
};

????????????????????????修改bank

(arch/arm/mach-s5pv210/include/mach/map.h)

//#define S5PV210_PA_DM9000 ? ? ? (0xA8000000)
#define S5PV210_PA_DM9000 ? ? ? (0x88000000)
#define S5P_PA_DM9000 ? ? ? ? ? S5PV210_PA_DM9000

? ? ? ? ? ? ? ? ? ? ? ? 结果显示