这次，还是把基本的基于我目前最新的Linux源码进行移植到OK6410吧，同时也写下我移植过程中遇到的问题及解决方法，不过有些方法是借鉴网上的，有些是自己加的，会有一些小bug。

一、基本工作

1. 源码下载    https://www.kernel.org/   ，最好是下载stable版本，否则会有小bug。（我现在调试的是stable版本， linux-3.14.4）

2. 拷到自己的文件夹下解压，我下的是.xz后缀的，这样文件比较小，只是解压时多一个步骤。

$ xz –d linux-3.14.4.tar.xz

$ tar xvf linux-3.14.4.tar

3. 解压完后，进入解压后的目录

二、源码修改

1. 修改根目录下的Makefile，针对修改arch和cross_compile，如下：

ARCH		?= arm

CROSS_COMPILE	?= arm-linux-

2. 添加相关型号mach文件

目前最新内核已经支持好几种开发板，我们先从最基本的6410开始，选择mini6410，基于mini6410来修改配置，因此，进入arch/arm/mach-s3c64xx目录，拷贝mach-mini6410.c，重命名为mach-ok6410.c,下面需要对该文件进行一些修改：

2.1 将代码中替换为6410, 如下： mini6410->ok6410;  MINI6410->OK6410

2.2 然后修改nand分区信息，修改static struct mtd_partition ok6410_nand_part[]，这个修改需要结合你之前移植Uboot及你自己定义的分区布局。我的是这样的。

static struct mtd_partition ok6410_nand_part[] = {

	[0] = {

		.name	= "Bootloader",

		.size	= SZ_1M,

		.offset	= 0,

		.mask_flags = MTD_CAP_NANDFLASH,

	},

	[1] = {

		.name	= "Linux Kernel",

		.size	= (5 * SZ_1M),

		.offset	= SZ_1M,

		.mask_flags = MTD_CAP_NANDFLASH,

	},

	[2] = {

		.name	= "File System",

		.size	= (200 * SZ_1M),

		.offset	= (6 * SZ_1M),

	},

	[3] = {

		.name	= "User",

		.offset	 = MTDPART_OFS_APPEND,

		.size	 = MTDPART_SIZ_FULL,

	}

};

2.3 既然我们添加了一个文件，依据linux添加文件的规则，我们还修改相对应目录下Makefile和Kconfig

修改kconfig,参照MINI6410的配置，添加OK6410,如下：

config MACH_OK6410

	bool "OK6410"

	select CPU_S3C6410

	select S3C64XX_SETUP_FB_24BPP

	select S3C64XX_SETUP_SDHCI

	select S3C64XX_SETUP_IDE

	select S3C_DEV_FB

	select S3C_DEV_HSMMC

	select S3C_DEV_HSMMC1

	select S3C_DEV_NAND

	select S3C_DEV_USB_HOST

	select SAMSUNG_DEV_ADC

	select SAMSUNG_DEV_TS

	select SAMSUNG_DEV_BACKLIGHT

	select SAMSUNG_DEV_IDE

	select SAMSUNG_DEV_PWM

	help

	  Machine support for the LXM OK6410

修改Makefile，加入ok6410

# Machine support

obj-$(CONFIG_MACH_ANW6410)		+= mach-anw6410.o

obj-$(CONFIG_MACH_HMT)			+= mach-hmt.o

obj-$(CONFIG_MACH_MINI6410)		+= mach-mini6410.o

obj-$(CONFIG_MACH_OK6410)		+= mach-ok6410.o

obj-$(CONFIG_MACH_NCP)			+= mach-ncp.o

obj-$(CONFIG_MACH_REAL6410)		+= mach-real6410.o

3. 修改arch/arm/tools/mach-types文件，加入OK6410的mach-type,这个必须和U-BOOT中的MACH-TYPE一致，这里选用smdk6410的mach-type:1626

ok6410 MACH_OK6410 OK6410 1626

4. Menuconfig配置

回到主目录下，我们选用针对6400的默认配置，在此基础上进行配置。复制config下的s3c6400_defconfig到主目录并重命名为.config文件

$  cp arch/arm/configs/s3c6400_defconfig  ./.config
  $  make menuconfig

进入后做如下配置：（这里说一下：此情况下删除你的输入，需要按delete+shift,按backspace是没用的）

4.1 选择General Setup,打开Cross_compiler tool perfix,输入arm-linux-


4.4 选择System Type, 取消其他6410，只选择OK6410

4.3 选择Kernel Features , 选择以下两项

4.4 为了调试方便，我们顺便把nand flash的debug也打开,并选择硬件ECC。

Device Drivers—>Memory Technology Device(MTD) support—>NAND Device Support—>

完成以上配置后，保存退出！

在主目录下执行，make uImage( 前提是你已经把Uboot tools/下的mkimage工具拷贝到/bin目录下)

最后在编译完成后，输出信息如下：

通过tftp下载到板子上，运行后界面如下：

从上面我们可以看出，内核加载地址和入口地址是一样的：50008000，这是不合理的，入口地址应该是50008000，因为是uImage，需要在入口处添加文件头。

因此我们进行如下修改：

修改scripts/下的makefile.lib文件：将UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 改为：

IMAGE_ENTRYADDR ?= $(shell echo $(UIMAGE_LOADADDR) | sed -e "s/..$$/40/")

# U-Boot mkimage

# ---------------------------------------------------------------------------

MKIMAGE := $(srctree)/scripts/mkuboot.sh

# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces

# the number of overrides in arch makefiles

UIMAGE_ARCH ?= $(SRCARCH)

UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)

UIMAGE_OPTS-y ?=

UIMAGE_TYPE ?= kernel

UIMAGE_LOADADDR ?= arch_must_set_this

#UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)

UIMAGE_ENTRYADDR ?= $(shell echo $(UIMAGE_LOADADDR) | sed -e "s/..$$/40/")

UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'

UIMAGE_IN ?= $<

UIMAGE_OUT ?= $@

修改后，再次make uImage, 编译完后的输出信息如下：


从上面我们可以看出，入口地址已经变为50008040,

下载到板子上，已经可以引导内核了。

从log可以看出，我们的nand flash并没有识别到，因为出错在这里：

[06/08-11:25:41:371]s3c24xx-nand s3c6400-nand: failed to get clock

[06/08-11:25:41:371]s3c24xx-nand: probe of s3c6400-nand failed with error –2

为了方便阅读，我还是在下一篇文章写吧，目前这个问题是需要解决的。

完整启动log如下：

[06/08-11:25:33:478]U-Boot 2010.03-svn3 (May 06 2014 - 22:13:20) for SMDK6410

[06/08-11:25:33:478]

[06/08-11:25:33:478]*******************************************************

[06/08-11:25:33:492]                Welcome to Embedded System

[06/08-11:25:33:494]                Base On S3C6410 Devolopment

[06/08-11:25:33:494]                Date:   2014/4/15 22:00 PM

[06/08-11:25:33:503]*******************************************************

[06/08-11:25:33:503]

[06/08-11:25:33:504]CPU:     S3C6410@533MHz

[06/08-11:25:33:531]         Fclk = 533MHz, Hclk = 133MHz, Pclk = 66MHz (ASYNC Mode)

[06/08-11:25:33:531]Board:   SMDK6410

[06/08-11:25:33:533]DRAM:  256 MB

[06/08-11:25:33:549]Flash:  0 kB

[06/08-11:25:33:549]NAND Flash:  2048 MB

[06/08-11:25:34:671]********************************************************

[06/08-11:25:34:671]Initial LCD controller

[06/08-11:25:34:684]  clk_freq:9 MHz,  div_freq:13 ,rea_freq:9 MHz

[06/08-11:25:34:684]

[06/08-11:25:34:685] HBP = 2 HFP = 2 HSW = 41,Hpixs:480

[06/08-11:25:34:685] VBP = 2 VFP = 2 VSW = 10,Vpixs:272

[06/08-11:25:34:703]FrameBuff:57e7a000

[06/08-11:25:34:703]  LCD initialization Finished.

[06/08-11:25:34:704]********************************************************

[06/08-11:25:34:724]In:    serial

[06/08-11:25:34:724]

[06/08-11:25:34:724]Out:   lcd

[06/08-11:25:34:726]

[06/08-11:25:34:726]Err:   lcd

[06/08-11:25:34:728]

[06/08-11:25:35:082]Net:   DM9000

[06/08-11:25:36:099]Hit any key to stop autoboot:  0

[06/08-11:25:36:099]

[06/08-11:25:36:099]NAND read:

[06/08-11:25:36:100]device 0 offset 0x100000, size 0x500000

[06/08-11:25:36:101]

[06/08-11:25:39:365] 5242880 bytes read: OK

[06/08-11:25:39:365]

[06/08-11:25:39:365]## Booting kernel from Legacy Image at 50008000 ...

[06/08-11:25:39:365]

[06/08-11:25:39:367]   Image Name:   Linux-3.14.4

[06/08-11:25:39:383]

[06/08-11:25:39:385]   Image Type:   ARM Linux Kernel Image (uncompressed)

[06/08-11:25:39:402]

[06/08-11:25:39:403]   Data Size:    1638488 Bytes =  1.6 MB

[06/08-11:25:39:418]

[06/08-11:25:39:419]   Load Address: 50008000

[06/08-11:25:39:443]

[06/08-11:25:39:443]   Entry Point:  50008040

[06/08-11:25:39:456]

[06/08-11:25:39:780]   Verifying Checksum ... OK

[06/08-11:25:39:798]

[06/08-11:25:39:799]   XIP Kernel Image ... OK

[06/08-11:25:39:811]

[06/08-11:25:39:812]OK

[06/08-11:25:39:829]

[06/08-11:25:39:830]

[06/08-11:25:39:830]Starting kernel ...

[06/08-11:25:39:830]

[06/08-11:25:39:842]

[06/08-11:25:39:860]

[06/08-11:25:39:874]

[06/08-11:25:40:162]Uncompressing Linux... done, booting the kernel.

[06/08-11:25:40:960]Booting Linux on physical CPU 0x0

[06/08-11:25:40:972]Linux version 3.14.4 (simiar@Embedded) (gcc version 4.4.3 (ctng-1.6.1) ) #1 Sun Jun 8 11:10:52 CST 2014

[06/08-11:25:40:976]CPU: ARMv6-compatible processor [410fb766] revision 6 (ARMv7), cr=00c5387d

[06/08-11:25:40:984]CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing instruction cache

[06/08-11:25:40:984]Machine: OK6410

[06/08-11:25:40:985]Ignoring unrecognised tag 0x54410008

[06/08-11:25:40:995]Memory policy: Data cache writeback

[06/08-11:25:40:995]CPU S3C6410 (id 0x36410101)

[06/08-11:25:40:995]CPU: found DTCM0 8k @ 00000000, not enabled

[06/08-11:25:40:996]CPU: moved DTCM0 8k to fffe8000, enabled

[06/08-11:25:41:006]CPU: found DTCM1 8k @ 00000000, not enabled

[06/08-11:25:41:006]CPU: moved DTCM1 8k to fffea000, enabled

[06/08-11:25:41:006]CPU: found ITCM0 8k @ 00000000, not enabled

[06/08-11:25:41:017]CPU: moved ITCM0 8k to fffe0000, enabled

[06/08-11:25:41:017]CPU: found ITCM1 8k @ 00000000, not enabled

[06/08-11:25:41:018]CPU: moved ITCM1 8k to fffe2000, enabled

[06/08-11:25:41:027]Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 65024

[06/08-11:25:41:038]Kernel command line: root=/dev/nfs nfsroot=192.168.1.100:/home/simiar/share/myproject/ok6410/filesystem/ok6410_fs ip=192.168.1.50:192.168.1.100:192.168.1.1:255.255.255.0::eth0:off console=ttySAC0,115200

[06/08-11:25:41:050]PID hash table entries: 1024 (order: 0, 4096 bytes)

[06/08-11:25:41:061]Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)

[06/08-11:25:41:061]Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)

[06/08-11:25:41:077]Memory: 256464K/262144K available (2173K kernel code, 175K rwdata, 664K rodata, 118K init, 198K bss, 5680K reserved)

[06/08-11:25:41:080]Virtual kernel memory layout:

[06/08-11:25:41:084]    vector  : 0xffff0000 - 0xffff1000   (   4 kB)

[06/08-11:25:41:084]    DTCM    : 0xfffe8000 - 0xfffec000   (  16 kB)

[06/08-11:25:41:085]    ITCM    : 0xfffe0000 - 0xfffe4000   (  16 kB)

[06/08-11:25:41:094]    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)

[06/08-11:25:41:095]    vmalloc : 0xd0800000 - 0xff000000   ( 744 MB)

[06/08-11:25:41:106]    lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)

[06/08-11:25:41:106]    modules : 0xbf000000 - 0xc0000000   (  16 MB)

[06/08-11:25:41:107]      .text : 0xc0008000 - 0xc02cd674   (2838 kB)

[06/08-11:25:41:117]      .init : 0xc02ce000 - 0xc02eb99c   ( 119 kB)

[06/08-11:25:41:118]      .data : 0xc02ec000 - 0xc0317f00   ( 176 kB)

[06/08-11:25:41:128]       .bss : 0xc0318000 - 0xc0349ac8   ( 199 kB)

[06/08-11:25:41:128]SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1

[06/08-11:25:41:128]NR_IRQS:246

[06/08-11:25:41:139]S3C6410 clocks: apll = 533000000, mpll = 533000000

[06/08-11:25:41:139]        epll = 24000000, arm_clk = 533000000

[06/08-11:25:41:140]VIC @f6000000: id 0x00041192, vendor 0x41

[06/08-11:25:41:151]VIC @f6010000: id 0x00041192, vendor 0x41

[06/08-11:25:41:151]sched_clock: 32 bits at 33MHz, resolution 30ns, wraps every 128929599457ns

[06/08-11:25:41:152]Console: colour dummy device 80x30

[06/08-11:25:41:161]Calibrating delay loop... 531.66 BogoMIPS (lpj=2658304)

[06/08-11:25:41:161]pid_max: default: 32768 minimum: 301

[06/08-11:25:41:172]Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)

[06/08-11:25:41:172]Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)

[06/08-11:25:41:173]CPU: Testing write buffer coherency: ok

[06/08-11:25:41:187]Setting up static identity map for 0x50214f90 - 0x50214fec

[06/08-11:25:41:194]VFP support v0.3: implementor 41 architecture 1 part 20 variant b rev 5

[06/08-11:25:41:194]DMA: preallocated 256 KiB pool for atomic coherent allocations

[06/08-11:25:41:195]OK6410: Option string ok6410=0

[06/08-11:25:41:205]OK6410: selected LCD display is 480x272

[06/08-11:25:41:205]S3C6410: Initialising architecture

[06/08-11:25:41:206]bio: create slab <bio-0> at 0

[06/08-11:25:41:217]pl08xdmac dma-pl080s.0: initialized 8 virtual memcpy channels

[06/08-11:25:41:217]pl08xdmac dma-pl080s.0: initialized 16 virtual slave channels

[06/08-11:25:41:227]pl08xdmac dma-pl080s.0: DMA: PL080s rev1 at 0x75000000 irq 73

[06/08-11:25:41:228]pl08xdmac dma-pl080s.1: initialized 8 virtual memcpy channels

[06/08-11:25:41:239]pl08xdmac dma-pl080s.1: initialized 12 virtual slave channels

[06/08-11:25:41:239]pl08xdmac dma-pl080s.1: DMA: PL080s rev1 at 0x75100000 irq 74

[06/08-11:25:41:240]usbcore: registered new interface driver usbfs

[06/08-11:25:41:250]usbcore: registered new interface driver hub

[06/08-11:25:41:251]usbcore: registered new device driver usb

[06/08-11:25:41:261]Switched to clocksource samsung_clocksource_timer

[06/08-11:25:41:262]futex hash table entries: 256 (order: 0, 7168 bytes)

[06/08-11:25:41:262]ROMFS MTD (C) 2007 Red Hat, Inc.

[06/08-11:25:41:263]io scheduler noop registered

[06/08-11:25:41:272]io scheduler deadline registered

[06/08-11:25:41:273]io scheduler cfq registered (default)

[06/08-11:25:41:278]s3c-fb s3c-fb: window 0: fb

[06/08-11:25:41:285]Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled

[06/08-11:25:41:286]s3c6400-uart.0: ttySAC0 at MMIO 0x7f005000 (irq = 69, base_baud = 0) is a S3C6400/10

[06/08-11:25:41:301]console [ttySAC0] enabled

[06/08-11:25:41:302]s3c6400-uart.1: ttySAC1 at MMIO 0x7f005400 (irq = 70, base_baud = 0) is a S3C6400/10

[06/08-11:25:41:305]s3c6400-uart.2: ttySAC2 at MMIO 0x7f005800 (irq = 71, base_baud = 0) is a S3C6400/10

[06/08-11:25:41:311]s3c6400-uart.3: ttySAC3 at MMIO 0x7f005c00 (irq = 72, base_baud = 0) is a S3C6400/10

[06/08-11:25:41:343]brd: module loaded

[06/08-11:25:41:362]loop: module loaded

[06/08-11:25:41:371]s3c24xx-nand s3c6400-nand: failed to get clock

[06/08-11:25:41:371]s3c24xx-nand: probe of s3c6400-nand failed with error -2

[06/08-11:25:41:383]ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver

[06/08-11:25:41:383]ohci-s3c2410: OHCI S3C2410 driver

[06/08-11:25:41:384]s3c2410-ohci s3c2410-ohci: OHCI Host Controller

[06/08-11:25:41:398]s3c2410-ohci s3c2410-ohci: new USB bus registered, assigned bus number 1

[06/08-11:25:41:401]s3c2410-ohci s3c2410-ohci: irq 79, io mem 0x74300000

[06/08-11:25:41:454]s3c2410-ohci s3c2410-ohci: init err (00000000 0000)

[06/08-11:25:41:456]s3c2410-ohci s3c2410-ohci: can't start

[06/08-11:25:41:468]s3c2410-ohci s3c2410-ohci: startup error -75

[06/08-11:25:41:469]s3c2410-ohci s3c2410-ohci: USB bus 1 deregistered

[06/08-11:25:41:470]s3c2410-ohci: probe of s3c2410-ohci failed with error -75

[06/08-11:25:41:479]mousedev: PS/2 mouse device common for all mice

[06/08-11:25:41:479]i2c /dev entries driver

[06/08-11:25:41:487]sdhci: Secure Digital Host Controller Interface driver

[06/08-11:25:41:494]sdhci: Copyright(c) Pierre Ossman

[06/08-11:25:41:495]s3c-sdhci s3c-sdhci.0: clock source 0: mmc_busclk.0 (133250000 Hz)

[06/08-11:25:41:498]s3c-sdhci s3c-sdhci.0: clock source 2: mmc_busclk.2 (24000000 Hz)

[06/08-11:25:41:534]mmc0: SDHCI controller on samsung-hsmmc [s3c-sdhci.0] using ADMA

[06/08-11:25:41:546]s3c-sdhci s3c-sdhci.1: clock source 0: mmc_busclk.0 (133250000 Hz)

[06/08-11:25:41:548]s3c-sdhci s3c-sdhci.1: clock source 2: mmc_busclk.2 (24000000 Hz)

[06/08-11:25:41:585]mmc1: SDHCI controller on samsung-hsmmc [s3c-sdhci.1] using ADMA

[06/08-11:25:41:597]usbcore: registered new interface driver usbhid

[06/08-11:25:41:598]usbhid: USB HID core driver

[06/08-11:25:41:608]drivers/rtc/hctosys.c: unable to open rtc device (rtc0)

[06/08-11:25:41:609]VFS: Cannot open root device "nfs" or unknown-block(0,255): error -6

[06/08-11:25:41:629]Please append a correct "root=" boot option; here are the available partitions:

[06/08-11:25:41:630]Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,255)

[06/08-11:25:41:636]CPU: 0 PID: 1 Comm: swapper Not tainted 3.14.4 #1

[06/08-11:25:41:636][<c0014238>] (unwind_backtrace) from [<c0011c74>] (show_stack+0x10/0x14)

[06/08-11:25:41:641][<c0011c74>] (show_stack) from [<c0211148>] (panic+0x8c/0x1dc)

[06/08-11:25:41:642][<c0211148>] (panic) from [<c02cf0a4>] (mount_block_root+0x220/0x2e8)

[06/08-11:25:41:652][<c02cf0a4>] (mount_block_root) from [<c02cf330>] (prepare_namespace+0x160/0x1b8)

[06/08-11:25:41:663][<c02cf330>] (prepare_namespace) from [<c02ce580>] (kernel_init_freeable+0x168/0x1ac)

[06/08-11:25:41:664][<c02ce580>] (kernel_init_freeable) from [<c0210b7c>] (kernel_init+0x8/0xec)

[06/08-11:25:41:672][<c0210b7c>] (kernel_init) from [<c000e838>] (ret_from_fork+0x14/0x3c)

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