内核移植(2)arch/arm/mach-s3c2440/mach-smdk2440.c

定义开发板参数在arch/arm/mach-s3c2440/mach-smdk2440.c中，如机器类型ID、起始I/O物理地址、Bootloader传入的参数的地址、中断初始化函数等。

arch/arm/kernel/head.S是内核执行的第一个文件。

S3c2440开发板上启动uImage时串口输出乱码的原因，开发板晶振的频率设置有问题。

1、在arch/arm/mach-s3c2440/mach-smdk2440.c修改，

static void __init smdk2440_map_io(void)

{

s3c24xx_init_io(smdk2440_iodesc, ARRAY_SIZE(smdk2440_iodesc));

s3c24xx_init_clocks(16934400);

s3c24xx_init_uarts(smdk2440_uartcfgs, ARRAY_SIZE(smdk2440_uartcfgs));

}

修改为：

static void __init smdk2440_map_io(void)

{

s3c24xx_init_io(smdk2440_iodesc, ARRAY_SIZE(smdk2440_iodesc));

s3c24xx_init_clocks(12000000);

s3c24xx_init_uarts(smdk2440_uartcfgs, ARRAY_SIZE(smdk2440_uartcfgs));

}

U-Boot控制界面，看到内核的启动信息如下：

OpenJTAG> bootm 0x32000000

## Booting image at 32000000 ...

Image Name:Linux-2.6.22.6

Created:2009-12-0911:36:02 UTC

Image Type:ARM Linux Kernel Image (uncompressed)

Data Size:1511064 Bytes =1.4 MB

Load Address: 30008000

Entry Point:30008000

Verifying Checksum ... OK

OK

Starting kernel ...

Uncompressing Linux......................................done, booting the kernel.

Linux version 2.6.22.6 (root@huanghuang-desktop) (gcc version 3.4.5) #1 Wed Dec 9 19:35:58 CST 2009

CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177

Machine: SMDK2410

Memory policy: ECC disabled, Data cache writeback

CPU S3C2410A (id 0x32410002)

S3C2410: core 200.000 MHz, memory 100.000 MHz, peripheral 50.000 MHz

S3C24XX Clocks, (c) 2004 Simtec Electronics

CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on

CPU0: D VIVT write-back cache

CPU0: I cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets

CPU0: D cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets

Built 1 zonelists.Total pages: 16256

Kernel command line: noinitrd root=/dev/mtdblock3 init=/linuxrc console=ttySAC0

irq: clearing subpending status 00000002

PID hash table entries: 256 (order: 8, 1024 bytes)

timer tcon=00500000, tcnt a2c1, tcfg 00000200,00000000, usec 00001eb8

Console: colour dummy device 80x30

Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)

Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)

Memory: 64MB = 64MB total

Memory: 61696KB available (2788K code, 313K data, 132K init)

Mount-cache hash table entries: 512

CPU: Testing write buffer coherency: ok

NET: Registered protocol family 16

S3C2410 Power Management, (c) 2004 Simtec Electronics

S3C2410: Initialising architecture

S3C24XX DMA Driver, (c) 2003-2004,2006 Simtec Electronics

DMA channel 0 at c4800000, irq 33

DMA channel 1 at c4800040, irq 34

DMA channel 2 at c4800080, irq 35

DMA channel 3 at c48000c0, irq 36

usbcore: registered new interface driver usbfs

usbcore: registered new interface driver hub

usbcore: registered new device driver usb

NET: Registered protocol family 2

IP route cache hash table entries: 1024 (order: 0, 4096 bytes)

TCP established hash table entries: 2048 (order: 2, 16384 bytes)

TCP bind hash table entries: 2048 (order: 1, 8192 bytes)

TCP: Hash tables configured (established 2048 bind 2048)

TCP reno registered

NetWinder Floating Point Emulator V0.97 (double precision)

JFFS2 version 2.2. (NAND) 2001-2006 Red Hat, Inc.

io scheduler noop registered

io scheduler anticipatory registered (default)

io scheduler deadline registered

io scheduler cfq registered

s3c2410-lcd s3c2410-lcd: no platform data for lcd, cannot attach

s3c2410-lcd: probe of s3c2410-lcd failed with error -22

lp: driver loaded but no devices found

ppdev: user-space parallel port driver

S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics

Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled

s3c2410-uart.0: s3c2410_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2410

s3c2410-uart.1: s3c2410_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2410

s3c2410-uart.2: s3c2410_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2410

RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize

loop: module loaded

dm9000 Ethernet Driver

Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2

ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx

BAST NOR-Flash Driver, (c) 2004 Simtec Electronics

S3C24XX NAND Driver, (c) 2004 Simtec Electronics

s3c2410-nand s3c2410-nand: Tacls=3, 30ns Twrph0=7 70ns, Twrph1=3 30ns

NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V 8-bit)

Scanning device for bad blocks

Creating 8 MTD partitions on "NAND 64MiB 3,3V 8-bit":

0x00000000-0x00004000 : "Boot Agent"

0x00000000-0x00200000 : "S3C2410 flash partition 1"

0x00400000-0x00800000 : "S3C2410 flash partition 2"

0x00800000-0x00a00000 : "S3C2410 flash partition 3"

0x00a00000-0x00e00000 : "S3C2410 flash partition 4"

0x00e00000-0x01800000 : "S3C2410 flash partition 5"

0x01800000-0x03000000 : "S3C2410 flash partition 6"

0x03000000-0x04000000 : "S3C2410 flash partition 7"

usbmon: debugfs is not available

s3c2410-ohci s3c2410-ohci: S3C24XX OHCI

s3c2410-ohci s3c2410-ohci: new USB bus registered, assigned bus number 1

s3c2410-ohci s3c2410-ohci: irq 42, io mem 0x49000000

usb usb1: configuration #1 chosen from 1 choice

hub 1-0:1.0: USB hub found

hub 1-0:1.0: 2 ports detected

mice: PS/2 mouse device common for all mice

S3C24XX RTC, (c) 2004,2006 Simtec Electronics

s3c2410-i2c s3c2410-i2c: slave address 0x10

s3c2410-i2c s3c2410-i2c: bus frequency set to 390 KHz

s3c2410-i2c s3c2410-i2c: i2c-0: S3C I2C adapter

TCP cubic registered

NET: Registered protocol family 1

drivers/rtc/hctosys.c: unable to open rtc device (rtc0)

List of all partitions:

1f0016 mtdblock0 (driver?)

1f012048 mtdblock1 (driver?)

1f024096 mtdblock2 (driver?)

1f032048 mtdblock3 (driver?)

1f044096 mtdblock4 (driver?)

1f0510240 mtdblock5 (driver?)

1f0624576 mtdblock6 (driver?)

1f0716384 mtdblock7 (driver?)

No filesystem could mount root, tried:ext3 ext2 cramfs msdos vfat romfs

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,3)