DavinciDM6446开发攻略UBOOT2009.03移植2nandflash的烧写

作者：ranger | 来源：互联网 | 2023-05-19 12:29

很长一段时间没有更新博客了，是因为要推出新开发方案和做好客户服务工作，忙得不易乐乎。有关DAVINCIU-BOOT的移植，以前写过一篇u-

很长一段时间没有更新博客了&＃xff0c;是因为要推出新开发方案和做好客户服务工作&＃xff0c;忙得不易乐乎。有关DAVINCI U-BOOT的移植&＃xff0c;以前写过一篇u-boot-1.3.4&＃xff08;2008年的&＃xff09;&＃xff0c;其实和这个u-boot-2009.03差别不大&＃xff0c;只不过这个u-boot-2009.03是从TI的网站上下载的&＃xff0c;是DAVINCI系列最新的u-boot&＃xff0c;也适合DM6467和DM365/368&＃xff0c;移植的方法承接《Davinci DM6446开发攻略——u-boot-1.3.4移植(1)》&＃xff0c;而本篇着重介绍nand flash的烧写。

Davinci产品需要烧写UBL、U-BOOT、KERNEL、ROOTFS这四个最基本的文件。UBL的烧写有两种方式&＃xff0c;一个就是TI开发包自带的NandWriter.out文件&＃xff0c;这必须使用560-plus仿真器&＃xff08;太贵了&＃xff01;&＃xff09;。另一个就是自己开发u-boot烧写&＃xff0c;或开发内核支持mtd block烧写&＃xff0c;我们一般移植u-boot进行烧写。这个烧写涉及到ECC校验&＃xff0c;移植比较复杂&＃xff0c;为了保护自己一点点知识产权的东西&＃xff0c;这里就保留不说&＃xff0c;不过购买本工作室的开发板或核心板&＃xff0c;都会提供烧写UBL的工具&＃xff0c;核心板我们直接就帮客户烧写好&＃xff08;没办法&＃xff0c;办公房租飞涨&＃xff0c;物价飞涨&＃xff0c;不&＃xff0c;是翻翻倍涨&＃xff0c;芯片炒作&＃xff0c;TI两款浮点工控芯片MCU F28XX的芯片从年初的120多元飞涨到600~800元&＃xff01;&＃xff0c;而且没货&＃xff01;所以说日子越来越不好过&＃xff09;。而u-boot和kernel的烧写&＃xff0c;则比较简单&＃xff0c;jffs2烧写稍微复杂一点。

关于u-boot-2009.03 nand flash的烧写&＃xff0c;命令分nand write 和 nand write.jffs2&＃xff0c;这两个命令是有差别的&＃xff0c;nand write主要用来烧写u-boot和kernel(uImage)&＃xff0c;和任何文件系统无关&＃xff0c;一些刚刚接触嵌入式LINUX的朋友需要了解这一点&＃xff0c;而nand write.jffs2专门用来烧写jffs2文件系统的&＃xff0c;当然&＃xff0c;你可以添加nand write.yaffs2&＃xff0c;nand write.squahfs等等&＃xff0c;这个在cmd_nand.c里的do_nand函数加自己的代码&＃xff0c;当然几个基本的nand文件u-boot-2009.03/drivers/mtd/nand是需要看看和了解的&＃xff0c;但不需要大改。DM6446 U-BOOT很多移植工作就是对davinci_dvevm.h的配置和定义&＃xff0c;nand flash的烧写也是在这里定义&＃xff0c;我们以这个文件进行讲解和分析&＃xff0c;让大家更了解U-BOOT&＃xff0c;不单单是nand flash的烧写。

#include/davinci_dvevm.h

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* Board */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

#define DV_EVM

//#define CONFIG_SYS_NAND_SMALLPAGE &＃xff08;这个是支持512字节NAND FLASH定义&＃xff09;

#define CONFIG_SYS_NAND_LARGEPAGE &＃xff08;本工作室的开发板核心板是2K—PAGE&＃xff0c;目前比较新的NAND&＃xff0c;因为有些客户需要移植yaffs2&＃xff0c;512字节的只能支持yaffs&＃xff0c;超级慢&＃xff09;

#undef CONFIG_SYS_USE_NOR&＃xff08;现在基本上取消NOR FLASH的支持&＃xff0c;价格贵&＃xff0c;容量小&＃xff09;

#define CONFIG_SYS_USE_NAND&＃xff08;定义板子使用NAND FLASH&＃xff09;

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* SoC Configuration */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

#define CONFIG_ARM926EJS /* arm926ejs CPU core */

#define CONFIG_SYS_CLK_FREQ 297000000 /* Arm Clock frequency */

#define CONFIG_SYS_TIMERBASE 0x01c21400 /* use timer 0 */

#define CONFIG_SYS_HZ_CLOCK 27000000 /* Timer Input clock freq */

#define CONFIG_SYS_HZ 1000

#define CONFIG_SOC_DM644X

//#define CONFIG_DISPLAY_CPUINFO &＃xff08;显示CPU的频率信息等&＃xff0c;屏蔽不用&＃xff0c;以后的版本都有这个&＃xff09;

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* EEPROM definitions for Atmel 24C256BN SEEPROM chip */

/* on Sonata/DV_EVM board. No EEPROM on schmoogie. */

&＃xff08;这个是TI 自己的EVM&＃xff0c;带有1个EEPROM&＃xff0c;保存MAC地址&＃xff0c;我们板子不用&＃xff0c;所以屏蔽&＃xff09;

//#define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 2

//#define CONFIG_SYS_I2C_EEPROM_ADDR 0x50

//#define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS 6

//#define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS 20

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* Memory Info */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

&＃xff08;DDR内存的一些定义&＃xff09;

#define CONFIG_SYS_MALLOC_LEN (0x10000 &＃43; 128*1024) /* malloc() len */

#define CONFIG_SYS_GBL_DATA_SIZE 128 /* reserved for initial data */

#define CONFIG_SYS_MEMTEST_START 0x80000000 /* memtest start address */

#define CONFIG_SYS_MEMTEST_END 0x81000000 /* 16MB RAM test */

#define CONFIG_NR_DRAM_BANKS 1 /* we have 1 bank of DRAM */

#define CONFIG_STACKSIZE (256*1024) /* regular stack */

#define PHYS_SDRAM_1 0x80000000 /* DDR Start */

#define PHYS_SDRAM_1_SIZE 0x10000000 /* DDR size 256MB */

#define DDR_8BANKS /* 8-bank DDR2 (256MB) */

&＃xff08;我们的核心板使用DDR256M-byte&＃xff0c;所以是8 bank&＃xff09;

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* Serial Driver info */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

&＃xff08;串口配置信息&＃xff0c;UART0&＃61;ttyS0&＃xff0c;一般用来打印LINUX调试信息&＃xff09;

#define CONFIG_SYS_NS16550

#define CONFIG_SYS_NS16550_SERIAL

#define CONFIG_SYS_NS16550_REG_SIZE -4 /* NS16550 register size, byteorder */

#define CONFIG_SYS_NS16550_COM1 0x01c20000 /* Base address of UART0 */

#define CONFIG_SYS_NS16550_CLK 27000000 /* Input clock to NS16550 */

#define CONFIG_CONS_INDEX 1 /* use UART0 for console */

#define CONFIG_BAUDRATE 115200 /* Default baud rate */

#define CONFIG_SYS_BAUDRATE_TABLE { 9600, 19200, 38400, 57600, 115200 }

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* I2C Configuration */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

&＃xff08;如果你不需要在U-BOOT对I2C芯片读写操作&＃xff0c;可以屏蔽这个&＃xff09;

//#define CONFIG_HARD_I2C

//#define CONFIG_DRIVER_DAVINCI_I2C

//#define CONFIG_SYS_I2C_SPEED 80000 /* 100Kbps won&＃39;t work, silicon bug */

//#define CONFIG_SYS_I2C_SLAVE 10 /* Bogus, master-only in U-Boot */

/* Network & Ethernet Configuration */

#define CONFIG_DRIVER_TI_EMAC

#define CONFIG_MII

#define CONFIG_BOOTP_DEFAULT

#define CONFIG_BOOTP_DNS

#define CONFIG_BOOTP_DNS2

#define CONFIG_BOOTP_SEND_HOSTNAME

#define CONFIG_NET_RETRY_COUNT 10

#define CONFIG_IPADDR 192.168.1.188 &＃xff08;板子U-BOOT的IP&＃xff09;

#define CONFIG_SERVERIP 192.168.1.252 &＃xff08;HOST 你的linux开发主机IP&＃xff0c;一般是NFS的IP&＃xff09;

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* Flash & Environment */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

#ifdef CONFIG_SYS_USE_NAND

#define CONFIG_NAND_DAVINCI

#undef CONFIG_ENV_IS_IN_FLASH

#define CONFIG_SYS_NO_FLASH

#define CONFIG_ENV_IS_IN_NAND /* U-Boot env in NAND Flash */

#ifdef CONFIG_SYS_NAND_SMALLPAGE

#define CONFIG_ENV_SECT_SIZE 512 /* Env sector Size */

#define CONFIG_ENV_SIZE SZ_16K

#else

#define CONFIG_ENV_SECT_SIZE 2048 /* Env sector Size */

#define CONFIG_ENV_SIZE SZ_128K

#endif

#define CONFIG_SKIP_LOWLEVEL_INIT /* U-Boot is loaded by a bootloader */

#define CONFIG_SKIP_RELOCATE_UBOOT /* to a proper address, init done */

#define CONFIG_SYS_NAND_BASE 0x02000000&＃xff08;这个是EMIF CS2的起始地址&＃xff0c;类似片选的说法&＃xff09;

#define CONFIG_SYS_NAND_HW_ECC &＃xff08;TI默认硬件 ECC&＃xff09;

#define CONFIG_SYS_MAX_NAND_DEVICE 1 /* Max number of NAND devices */

&＃xff08;上面的定义表示板子只有1片NAND FLASH&＃xff09;

#define CONFIG_MASK_CLE 0x10

#define CONFIG_MASK_ALE 0x08

#define CONFIG_ENV_OFFSET 0xE0000 /* Block 7--not used by bootcode */

&＃xff08;上面的定义就是存放u-boot参数的地址&＃xff0c;源码是0x0&＃xff0c;但我们一般把参数放到U-BOOT存储地址前后&＃xff09;

#define DEF_BOOTM ""

#elif defined(CONFIG_SYS_USE_NOR) &＃xff08;这个是支持NOR FLASH的定义&＃xff0c;不用理会&＃xff09;

#ifdef CONFIG_NOR_UART_BOOT

#define CONFIG_SKIP_LOWLEVEL_INIT /* U-Boot is loaded by a bootloader */

#define CONFIG_SKIP_RELOCATE_UBOOT /* to a proper address, init done */

#else

#undef CONFIG_SKIP_LOWLEVEL_INIT

#undef CONFIG_SKIP_RELOCATE_UBOOT

#endif

#define CONFIG_ENV_IS_IN_FLASH

#undef CONFIG_SYS_NO_FLASH

#define CONFIG_FLASH_CFI_DRIVER

#define CONFIG_SYS_FLASH_CFI

#define CONFIG_SYS_MAX_FLASH_BANKS 1 /* max number of flash banks */

#define CONFIG_SYS_FLASH_SECT_SZ 0x20000 /* 128KB sect size Intel Flash */

#define CONFIG_ENV_OFFSET (CONFIG_SYS_FLASH_SECT_SZ*3)

#define PHYS_FLASH_1 0x02000000 /* CS2 Base address */

#define CONFIG_SYS_FLASH_BASE PHYS_FLASH_1 /* Flash Base for U-Boot */

#define PHYS_FLASH_SIZE 0x1000000 /* Flash size 16MB */

#define CONFIG_SYS_MAX_FLASH_SECT 512

#define CONFIG_ENV_SECT_SIZE CONFIG_SYS_FLASH_SECT_SZ /* Env sector Size */

#define CONFIG_SYS_FLASH_PROTECTION

#endif

/* U-Boot general configuration */

#undef CONFIG_USE_IRQ /* No IRQ/FIQ in U-Boot */

#define CONFIG_MISC_INIT_R

#define CONFIG_BOOTDELAY 2 &＃xff08;这个DELAY一般定义1~2,3秒太长&＃xff0c;为了缩短BOOT的时间&＃xff0c;有些产品直接不定义&＃xff0c;或0&＃xff09;

#define CONFIG_BOOTFILE "uImage" /* Boot file name */

&＃xff08;这uImage其实是linux内核的镜像文件&＃xff0c;也就是uImage&＃61;zImage &＃43; 被U-BOOT识别的header&＃xff0c;或者是mkimage处理过的Image文件&＃xff09;

#define CONFIG_SYS_PROMPT "U-Boot > " /* Monitor Command Prompt */

#define CONFIG_SYS_CBSIZE 1024 /* Console I/O Buffer Size */

#define CONFIG_SYS_PBSIZE (CONFIG_SYS_CBSIZE&＃43;sizeof(CONFIG_SYS_PROMPT)&＃43;16) /* Print buffer sz */

#define CONFIG_SYS_MAXARGS 16 /* max number of command args */

#define CONFIG_SYS_BARGSIZE CONFIG_SYS_CBSIZE /* Boot Argument Buffer Size */

#define CONFIG_SYS_LOAD_ADDR 0x82000000 /* 0x80700000 default Linux kernel load address */

&＃xff08;这个是TFTP或RS232下载各个镜像文件缓存的地址&＃xff0c;默认是0x80700000&＃xff0c;但是由于自己制作的ROOTFS文件很大&＃xff0c;有些往外超过32M&＃xff0c;而U-BOOT本身运行的起始地址是“TEXT_BASE &＃61; 0x81080000”&＃xff0c;所以我们把下载文件缓存的地址改为0x82000000&＃xff09;

#define CONFIG_VERSION_VARIABLE

#define CONFIG_AUTO_COMPLETE /* Won&＃39;t work with hush so far, may be later */

#define CONFIG_SYS_HUSH_PARSER

#define CONFIG_SYS_PROMPT_HUSH_PS2 "> "

#define CONFIG_CMDLINE_EDITING

#define CONFIG_SYS_LONGHELP

#define CONFIG_CRC32_VERIFY

#define CONFIG_MX_CYCLIC

#define CONFIG_MUSB_HCD &＃xff08;DAVINCI平台在U-BOOT支持USB HUB&＃xff09;

#define CONFIG_USB_DAVINCI

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* Linux Information */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

#define LINUX_BOOT_PARAM_ADDR 0x80000100

#define CONFIG_CMDLINE_TAG

#define CONFIG_SETUP_MEMORY_TAGS

#define CONFIG_BOOTARGS "mem&＃61;118M console&＃61;ttyS0,115200n8 ip&＃61;192.168.1.188 noinitrd root&＃61;/dev/nfs rw nfsroot&＃61;192.168.1.252:/home/davinci/nfs/tirootfs,nolock"

//#define CONFIG_BOOTARGS "mem&＃61;118M console&＃61;ttyS0,115200n8 root&＃61;/dev/mtdblock2 rw rootfstype&＃61;jffs2 noinitrd ip&＃61;off"

&＃xff08;上面的定义就是bootargs的参数了&＃xff0c;一个是NFS&＃xff0c;另一个是产品级的参数&＃xff09;

#define CONFIG_ETHADDR 00:03:55:88:00:00&＃xff08;UBOOT一般不在公网上运行&＃xff0c;所以可以随便定义一个MAC地址&＃xff09;

#define CONFIG_BOOTCOMMAND "run nand_boot"&＃xff08;这是NAND BOOT的命令定义&＃xff0c;见后半部分介绍&＃xff09;

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* U-Boot commands */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

&＃xff08;随着时间的推移&＃xff0c;U-BOOT越来越完善&＃xff0c;功能越来越强大&＃xff0c;同时生产的BIN文件也越大&＃xff0c;有些公司产品成本控制很严格&＃xff0c;往往使用容量小的FLASH&＃xff0c;这时就需要对任何的镜像文件进行“瘦身”&＃xff0c;只有保证U-BOOT基本功能&＃xff0c;其他功能统统屏蔽掉&＃xff0c;这样编译出来的BIN就小多了&＃xff09;

#include

#define CONFIG_CMD_ASKENV

#undef CONFIG_CMD_BOOTD

#undef CONFIG_CMD_DHCP

#undef CONFIG_CMD_DIAG

#undef CONFIG_CMD_I2C

#define CONFIG_CMD_MII

#define CONFIG_CMD_PING

#define CONFIG_CMD_SAVES

#undef CONFIG_CMD_EEPROM

#undef CONFIG_CMD_BDI

#undef CONFIG_CMD_FPGA

#undef CONFIG_CMD_NFS

#undef CONFIG_CMD_SETGETDCR

#ifdef CONFIG_SYS_USE_NAND

#undef CONFIG_CMD_FLASH

#undef CONFIG_CMD_IMLS

#define CONFIG_CMD_NAND

#define CONFIG_JFFS2_NAND&＃xff08;为了支持JFFS2在NAND的烧写&＃xff0c;必须定义这个&＃xff09;

#elif defined(CONFIG_SYS_USE_NOR)

#define CONFIG_CMD_JFFS2

#else

#error "Either CONFIG_SYS_USE_NAND or CONFIG_SYS_USE_NOR _MUST_ be defined !!!"

#endif

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* USB MSC support (if any) */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

#ifdef CONFIG_USB_DAVINCI

#define CONFIG_CMD_USB

#ifdef CONFIG_MUSB_HCD

#define CONFIG_USB_STORAGE

#define CONFIG_CMD_STORAGE

#define CONFIG_CMD_FAT

#define CONFIG_DOS_PARTITION

#endif

#ifdef CONFIG_USB_KEYBOARD

#define CONFIG_SYS_USB_EVENT_POLL

#define CONFIG_PREBOOT "usb start"

#endif

#undef CONFIG_CMD_LOADB /* loadb */&＃xff08;“瘦身”&＃xff09;

#undef CONFIG_CMD_LOADS /* loads */

#undef CONFIG_CMD_ITEST

#undef CONFIG_CMD_XIMG

#undef CONFIG_CMD_KGDB

#undef CONFIG_CMD_SOURCE /* "source" command support */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

/* KGDB support (if any) */

/*&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;*/

#ifdef CONFIG_CMD_KGDB

#define CONFIG_KGDB_BAUDRATE 115200 /* speed to run kgdb serial port */

#define CONFIG_KGDB_SER_INDEX 1 /* which serial port to use */

#endif

#define CONFIG_EXTRA_ENV_SETTINGS \

"clearenv&＃61;nand erase 0xe0000 0x20000;\0" \

"cleardata&＃61;nand erase 0x7000000 0x1000000\0" \

"updateuboot&＃61;tftp 0x82000000 davinci_uboot.bin;nand erase 0x100000 0x80000\0" \

"updatecore&＃61;tftp 0x82000000 davinci_kernel.bin;nand erase 0x180000 0x480000\0" \

"updaterootfs&＃61;tftp 0x82000000 davinci_rootfs.bin;nand erase 0x600000 0x6A00000\0" \

"nand_boot&＃61;nboot 0x80008000 0 0x180000;bootm 0x80008000\0" \

"tftp_boot&＃61;tftpboot 0x80008000 davinci_kernel.bin;bootm 0x80008000\0"

&＃xff08;

因为是2k-page的NAND&＃xff0c;

分区情况&＃xff1a;

根据TI 文档说明&＃xff0c;对于LARGE PAGE的NAND&＃xff0c;UBL只能存放在0x20000~0x40000区间&＃xff1b;

U-BOOT: addr&＃61;0x00100000, size&＃61;0x00080000&＃xff1b;

KERNEL(CORE): addr&＃61;0x00180000,size&＃61;0x00480000;

ROOTFS(mtdblock2): addr&＃61;0x00600000,size&＃61;0x06A00000;

DATA(mtdblock3): addr&＃61;0x07000000,size&＃61;0x01000000;

注意TFTP要先下载&＃xff0c;再擦除&＃xff0c;否则网口不行就先擦除FLASH&＃xff0c;悲剧是一直上演。

&＃xff09;

#endif /* __CONFIG_H */

根据CONFIG_EXTRA_ENV_SETTINGS的定义&＃xff0c;我们可以使用以下命令烧写操作

U-Boot > run updateuboot&＃xff08;U-BOOT支持run命令&＃xff09;

TFTP from server 192.168.1.252; our IP address is 192.168.1.188

Filename &＃39;davinci_uboot.bin&＃39;.

Load address: 0x82000000

Loading: ############

done

Bytes transferred &＃61; 167920 (28ff0 hex)

NAND erase: device 0 offset 0x100000, size 0x80000

Erasing at 0x160000 -- 100% complete.

U-Boot > nand write 82000000 100000 2A000 (实际长度是0x28ff0&＃xff0c;但我们使用0x2A000&＃xff0c;128K-byte的倍数)

提示&＃xff1a;U-BOOT > 烧写命令能识别82000000 100000这些16进制。

U-BOOT编译时生成的u-boot.bin是不能被UBL给BOOT起来的&＃xff0c;因为u-boot.bin没带有文件头header&＃xff0c;而u-boot.img是可以被UBL给BOOT起来&＃xff0c;这一点要注意。而我们的davinci_uboot.bin是经过U-BOOT自带的mkimage处理的。

U-Boot > run updatecore下载davinci_rootfs.bin&＃xff08;uImage&＃xff09;&＃xff1b;

上面的命令只是下载和erase flash分区&＃xff0c;并没有烧写&＃xff0c;请参考nand write 82000000 180000 size的格式。

U-Boot > run updaterootfs下载davinci_rootfs.bin&＃xff1b;怎样产生rootfs镜像文件见《TI Davinci DM6446开发攻略——根文件系统的裁剪》

nand write.Jffs2 82000000 600000 size

nand_boot&＃61;nboot 0x80008000 0x0 0x180000;bootm 0x80008000

表示从NAND 0x180000的地方COPY内核到DDR内存0x80008000的地址&＃xff0c;0x0表示nand_info[0]的下标0&＃xff0c;因为我们系统只支持1片nand CONFIG_SYS_MAX_NAND_DEVICE

JFFS2的烧写&＃xff0c;移植时&＃xff0c;需要注意ECC的问题&＃xff0c;同时内核移植里也有统一对应&＃xff0c;否则内核无法加载JFFS2&＃xff0c;这里就保留不多说&＃xff0c;本人已经指明了道路&＃xff0c;烧写命令也说明了&＃xff0c;需要有兴趣的朋友去试试&＃xff0c;不试怎么能提高自己呢&＃xff1f;

声明一下&＃xff0c;很多朋友转载本人的文章&＃xff0c;绝大多数人都保留本人51CTO的信息&＃xff0c;这点是值得肯定的&＃xff0c;但是也有个别网站&＃xff0c;把这些信息故意删除掉&＃xff0c;特别鄙视这种行为。

本文出自 “集成系统-踏上文明的征程” 博客&＃xff0c;请务必保留此出处http://zjbintsystem.blog.51cto.com/964211/392000