Helper2416-22——裸机第十一弹——兴奋！YL-boot启动内核+源码
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本帖最后由 yuanlai2010 于 2014-7-30 21:51 编辑
兴奋！YL-boot启动内核
参与Helper2416开发板助学计划心得
当屏幕亮起来的那一刻真的很激动，很兴奋。顿时感觉这几天的付出终于有了收获，同时也给了自己更多的信心，相信自己可以把嵌入式Linux学好。下面就来分享我的这份喜悦！
首先用上一版本的 YL-boot ( 现在我管他叫 YL-boot for SD) 把新的 YL-boot (for nand) 烧写到 nand 的 0 地址处。
接着尝试从NAND启动系统，但是发现并不能像期待的的那样把内核启动起来，后来尝试把nand0x40000开始的连续0x300000字节的数据通过串口打印出来，发现数据全部为0，没办法，那我就尝试通过 YL-boot for SD重新把zImage.43重新烧写到 nand0x40000处的位置，再重nand启动。
哦也！喜悦！屏幕亮了， 串口打印信息截图如下
完整信息如下
******** YL-boot ******** EEWORLD ID: yuanlai2010 ******* 2014-07-29 ****** ***** Start Kernel **** Loading Kernel ...... Jumping to Kernel ********** end ********** Uncompressing Linux... done, booting the kernel. Linux version 3.2.50+ (d02cj@LinuxServer0) (gcc version 4.4.6 (crosstool-NG 1.13.3) ) #407 Mon Feb 24 22:49:49 CST 2014 CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177 CPU: VIVT data cache, VIVT instruction cache Machine: SMDK2416 Memory policy: ECC disabled, Data cache writeback CPU S3C2416/S3C2450 (id 0x32450003) S3C24XX Clocks, Copyright 2004 Simtec Electronics CPU: MPLL on 800.000 MHz, cpu 400.000 MHz, mem 133.333 MHz, pclk 66.666 MHz Warning: USB host bus not at 48MHz CPU: EPLL off 96.000 MHz, usb-bus 12.000 MHz Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256 Kernel command line: root=/dev/mtdblock2 console=ttySAC0,115200 rootfstype=yaffs2 mem=64m PID hash table entries: 256 (order: -2, 1024 bytes) 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: 59612k/59612k available, 5924k reserved, 0K highmem Virtual kernel memory layout: vector : 0xffff0000 - 0xffff1000 ( 4 kB) fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB) vmalloc : 0xc4800000 - 0xf6000000 ( 792 MB) lowmem : 0xc0000000 - 0xc4000000 ( 64 MB) modules : 0xbf000000 - 0xc0000000 ( 16 MB) .text : 0xc0008000 - 0xc048f598 (4638 kB) .init : 0xc0490000 - 0xc04d4000 ( 272 kB) .data : 0xc04d4000 - 0xc04ff500 ( 174 kB) .bss : 0xc04ff524 - 0xc052c81c ( 181 kB) SLUB: Genslabs=13, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 NR_IRQS:109 irq: clearing subpending status 00000002 Console: colour dummy device 80x30 Calibrating delay loop... 199.47 BogoMIPS (lpj=498688) pid_max: default: 32768 minimum: 301 Mount-cache hash table entries: 512 CPU: Testing write buffer coherency: ok NET: Registered protocol family 16 S3C Power Management, Copyright 2004 Simtec Electronics S3C2416: Initializing architecture S3C2416: IRQ Support S3C24XX DMA Driver, Copyright 2003-2006 Simtec Electronics DMA channel 0 at c4804000, irq 88 DMA channel 1 at c4804100, irq 89 DMA channel 2 at c4804200, irq 90 DMA channel 3 at c4804300, irq 91 DMA channel 4 at c4804400, irq 92 DMA channel 5 at c4804500, irq 93 DMA channel 6 at c4804600, irq 99 DMA channel 7 at c4804700, irq 100 bio: create slab <bio-0> at 0 SCSI subsystem initialized usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb input: helper2416_keypad as /devices/platform/helper2416_keypad/input/input0 s3c-i2c s3c2410-i2c: slave address 0x10 s3c-i2c s3c2410-i2c: bus frequency set to 65 KHz s3c-i2c s3c2410-i2c: i2c-0: S3C I2C adapter Advanced Linux Sound Architecture Driver Version 1.0.24. 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 UDP hash table entries: 256 (order: 0, 4096 bytes) UDP-Lite hash table entries: 256 (order: 0, 4096 bytes) NET: Registered protocol family 1 RPC: Registered named UNIX socket transport module. RPC: Registered udp transport module. RPC: Registered tcp transport module. RPC: Registered tcp NFSv4.1 backchannel transport module. NetWinder Floating Point Emulator V0.97 (double precision) s3c-adc s3c24xx-adc: attached adc driver helper2416 pwm device Driver s3c24xx-pwm s3c24xx-pwm.0: tin at 33333333, tdiv at 33333333, tin=divclk, base 0 s3c24xx-pwm s3c24xx-pwm.1: tin at 33333333, tdiv at 33333333, tin=divclk, base 8 s3c24xx-pwm s3c24xx-pwm.2: tin at 11111111, tdiv at 11111111, tin=divclk, base 12 s3c24xx-pwm s3c24xx-pwm.3: tin at 11111111, tdiv at 11111111, tin=divclk, base 16 nfs4filelayout_init: NFSv4 File Layout Driver Registering... NTFS driver 2.1.30 [Flags: R/O]. JFFS2 version 2.2. (NAND) 漏 2001-2006 Red Hat, Inc. ROMFS MTD (C) 2007 Red Hat, Inc. msgmni has been set to 116 Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253) io scheduler noop registered io scheduler deadline registered io scheduler cfq registered (default) S3C NAND Driver, (c) 2007 Samsung Electronics S3C NAND Driver is using hardware ECC. NAND device: Manufacturer ID: 0xec, Chip ID: 0xda (Samsung NAND 256MiB 3,3V 8-bit) Creating 3 MTD partitions on "NAND 256MiB 3,3V 8-bit": 0x000000000000-0x000000040000 : "Bootloader" 0x000000040000-0x000000400000 : "Kernel" 0x000000400000-0x000010000000 : "File System" LCD TYPE :: S3C_4.3inch LCD will be initialized S3C_LCD clock got enabled :: 133.333 Mhz Window[0]- FB1 : map_video_memory: clear ffd80000:0003fc00 FB1 : map_video_memory: dma=33980000 cpu=ffd80000 size=0003fc00 Console: switching to colour frame buffer device 60x34 fb-1068365652: frame buffer device Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled s3c2440-uart.0: ttySAC0 at MMIO 0x50000000 (irq = 70) is a S3C2440 console [ttySAC0] enabled s3c2440-uart.1: ttySAC1 at MMIO 0x50004000 (irq = 73) is a S3C2440 s3c2440-uart.2: ttySAC2 at MMIO 0x50008000 (irq = 76) is a S3C2440 s3c2440-uart.3: ttySAC3 at MMIO 0x5000c000 (irq = 94) is a S3C2440 lp: driver loaded but no devices found ppdev: user-space parallel port driver helper2416 adc device Driver brd: module loaded loop: module loaded SCSI Media Changer driver v0.25 CAN device driver interface mcp251x spi0.0: probed Invalid chip endian 0x00000000 smc911x: not found (-19). PPP generic driver version 2.4.2 PPP BSD Compression module registered PPP Deflate Compression module registered PPP MPPE Compression module registered ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver 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 hub 1-0:1.0: USB hub found hub 1-0:1.0: 2 ports detected usbcore: registered new interface driver cdc_acm cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters Initializing USB Mass Storage driver... usbcore: registered new interface driver usb-storage USB Mass Storage support registered. usbcore: registered new interface driver usbserial USB Serial support registered for generic usbcore: registered new interface driver usbserial_generic usbserial: USB Serial Driver core USB Serial support registered for GSM modem (1-port) usbcore: registered new interface driver option option: v0.7.2:USB Driver for GSM modems mousedev: PS/2 mouse device common for all mice samsung-ts s3c2410-ts: driver attached, registering input device input: S3C24XX TouchScreen as /devices/virtual/input/input1 S3C24XX RTC, (c) 2004,2006 Simtec Electronics s3c-rtc s3c2410-rtc: rtc disabled, re-enabling s3c-rtc s3c2410-rtc: rtc core: registered s3c as rtc0 i2c /dev entries driver S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics sdhci: Secure Digital Host Controller Interface driver sdhci: Copyright(c) Pierre Ossman s3c-sdhci s3c-sdhci.0: clock source 0: hsmmc (133333333 Hz) s3c-sdhci s3c-sdhci.0: clock source 1: hsmmc (133333333 Hz) s3c-sdhci s3c-sdhci.0: clock source 2: hsmmc-if (12000000 Hz) mmc0: SDHCI controller on samsung-hsmmc [s3c-sdhci.0] using ADMA s3c-sdhci s3c-sdhci.1: clock source 0: hsmmc (133333333 Hz) s3c-sdhci s3c-sdhci.1: clock source 1: hsmmc (133333333 Hz) s3c-sdhci s3c-sdhci.1: clock source 2: hsmmc-if (12000000 Hz) mmc1: SDHCI controller on samsung-hsmmc [s3c-sdhci.1] using ADMA usbcore: registered new interface driver usbhid usbhid: USB HID core driver asoc: wm8731-hifi <-> s3c24xx-iis mapping ok ALSA device list: #0: wm8731 TCP cubic registered NET: Registered protocol family 17 can: controller area network core (rev 20090105 abi 8) NET: Registered protocol family 29 can: raw protocol (rev 20090105) can: broadcast manager protocol (rev 20090105 t) Registering the dns_resolver key type s3c-rtc s3c2410-rtc: setting system clock to 2000-01-01 00:01:01 UTC (946684861) yaffs: dev is 32505858 name is "mtdblock2" rw yaffs: passed flags "" s3c-nand: ECC uncorrectable error detected s3c-nand: ECC uncorrectable error detected s3c-nand: ECC uncorrectable error detected mmc1: new high speed SDHC card at address 0007 mmcblk0: mmc1:0007 SD8GB 7.21 GiB mmcblk0: p1 VFS: Mounted root (yaffs2 filesystem) on device 31:2. Freeing init memory: 272K FAT-fs (mmcblk0p1): utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive! [31/Dec/1999:16:01:07 +0000] boa: server version Boa/0.94.13 [31/Dec/1999:16:01:07 +0000] boa: server built Mar 26 2009 at 15:28:42. [31/Dec/1999:16:01:07 +0000] boa: starting server pid=74, port 80 ifconfig: SIOCSIFADDR: No such device route: SIOCADDRT: Network is unreachable Please press Enter to activate this console. 复制代码 特意测试了下从按下复位键到屏幕点亮的所需的时间并作对比，第一张为 YL-boot 的测试时间，第二张为u-boot的测试时间。
o(︶︿︶)o 唉！为什么不比u-boot快呢？
据观察，启动的时间主要耗费在读取内核到SDRAM和内核自解压上。
根据刚开始需要重新烧写zImage.43的现象及测试，大概猜测是u-boot的nand烧写可能没有校验ECC（源码中没看到有，也有可能是我看的不够仔细），而我用的nand读写函数是加入了ECC校验的，导致不能正常读出原来u-boot烧写进去的内核。下一步就是要继续去验证这些问题！八月份开始玩应用和驱动！
最后附上源码，这个只有启动内核的功能。感兴趣的就自己拿去玩吧！
论坛ID：yuanlai2010
发表时间：2014-07-29
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