OK6410（256MRAM2Gnandflash） uboot2010.03移植笔记

对于arm11这个版本的uboot足够用了，想试试ubi文件系统的朋友 这个版本也是支持的，虽然还没试过，据说读写速度比yaffs2快。

下面一系列笔记很多都是参考网上的，但我争取比他们写得更详细，难免以后自己还是会遇到这些问题，好记性不如烂笔头，呵呵。

先告诉一些想移植的朋友，移植前先看看前人的笔记是很有帮助的，对一个新版本的移植，记得要看一下英文的read me文档，祝你们移植成功。

 

移植中主要修改和创建的文件。

1.  在board/samsung下建立文件夹，把smdk6400 文件夹里面的东西复制到 smdk6410 文件夹中，把所有6400的字眼全部改成6410，

2.进入include/asm-arm/arch-s3c64xx/，同理复制s3c6400.h的文件内容，并改6400为6410

3.进入根目录下的makefile，同理把6400换成6410

4.现在到很重要的地方了 吼吼，启动代码 start.s，泪牛满面，关于这个代码的详细分析看这个帖子，真得很详细 点击打开链接

下面贴上代码修改后的start.S

/* *  armboot - Startup Code for S3C6400/ARM1176 CPU-core * * Copyright (c) 2007 Samsung Electronics * * Copyright (C) 2008 * Guennadi Liakhovetki, DENX Software Engineering, <[e-mail]> * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * * 2007-09-21 - Restructured codes by jsgood ([e-mail]) * 2007-09-21 - Added MoviNAND and OneNAND boot codes by * jsgood ([e-mail]) * Base codes by scsuh (sc.suh) */#include <config.h>#include <version.h>#ifdef CONFIG_ENABLE_MMU#include <asm/proc/domain.h>#endif#include <asm/arch/s3c6400.h>#if !defined(CONFIG_ENABLE_MMU) && !defined(CONFIG_SYS_PHY_UBOOT_BASE)#define CONFIG_SYS_PHY_UBOOT_BASE CONFIG_SYS_UBOOT_BASE#endif/* ************************************************************************* * * Jump vector table as in table 3.1 in [1] * ************************************************************************* */.globl _start_start: b reset#ifndef CONFIG_NAND_SPLldr pc, _undefined_instructionldr pc, _software_interruptldr pc, _prefetch_abortldr pc, _data_abortldr pc, _not_usedldr pc, _irqldr pc, _fiq_undefined_instruction:.word undefined_instruction_software_interrupt:.word software_interrupt_prefetch_abort:.word prefetch_abort_data_abort:.word data_abort_not_used:.word not_used_irq:.word irq_fiq:.word fiq_pad:.word 0x12345678 /* now 16*4=64 */#else. = _start + 64#endif.global _end_vect_end_vect:.balignl 16,0xdeadbeef/* ************************************************************************* * * Startup Code (reset vector) * * do important init only if we don't start from memory! * setup Memory and board specific bits prior to relocation. * relocate armboot to ram * setup stack * ************************************************************************* */_TEXT_BASE:.word TEXT_BASE/* * Below variable is very important because we use MMU in U-Boot. * Without it, we cannot run code correctly before MMU is ON. * by scsuh. */_TEXT_PHY_BASE:.word CONFIG_SYS_PHY_UBOOT_BASE.globl _armboot_start_armboot_start:.word _start/* * These are defined in the board-specific linker script. */.globl _bss_start_bss_start:.word __bss_start.globl _bss_end_bss_end:.word _end/* * the actual reset code */reset:/** set the cpu to SVC32 mode*/mrs r0, cpsr//bic r0, r0, #0x3fbic r0, r0, #0x3forr r0, r0, #0xd3msr cpsr, r0/* ************************************************************************* * * CPU_init_critical registers * * setup important registers * setup memory timing * ************************************************************************* *//** we do sys-critical inits only at reboot,* not when booting from ram!*/cpu_init_crit:/** When booting from NAND - it has definitely been a reset, so, no need* to flush caches and disable the MMU*/#ifndef CONFIG_NAND_SPL/** flush v4 I/D caches*/mov r0, #0mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB *//** disable MMU stuff and caches//////////////////////////////////////////////////////////////////////////////////////////*/mrc p15, 0, r0, c1, c0, 0bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)orr r0, r0, #0x00000002 @ set bit 2 (A) Alignorr r0, r0, #0x00001000 @ set bit 12 (I) I-Cachemcr p15, 0, r0, c1, c0, 0/* Prepare to disable the MMU *///adr r1, mmu_disable_phys/* We presume we're within the first 1024 bytes *///and r1, r1, #0x3fc//ldr r2, _TEXT_PHY_BASE//ldr r3, =0xfff00000//and r2, r2, r3//orr r2, r2, r1//b mmu_disable//.align 5/* Run in a single cache-line *///mmu_disable:// mcr p15, 0, r0, c1, c0, 0// nop// nop// mov pc, r2//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////#endifmmu_disable_phys:/* Peri port setup */ldr r0, =0x70000000orr r0, r0, #0x13mcr p15,0,r0,c15,c2,4       @ 256M (0x70000000 - 0x7fffffff)/** Go setup Memory and board specific bits prior to relocation.*/bl lowlevel_init /* go setup pll,mux,memory *//* when we already run in ram, we don't need to relocate U-Boot.////////////////////////////////////////////////////////////////////* and actually, memory controller must be configured before U-Boot* is running in ram.*/ldr r0, =0xff000fffbic r1, pc, r0  /* r0 <- current base addr of code */ldr r2, _TEXT_BASE  /* r1 <- original base addr in ram */bic r2, r2, r0  /* r0 <- current base addr of code */cmp     r1, r2                  /* compare r0, r1                  */beq     after_copy  /* r0 == r1 then skip flash copy   */#ifdef CONFIG_BOOT_NAND  mov r0, #0x1000bl copy_from_nand#endif after_copy://///////////////////////////////////////////////////////////////////////////////////////////////#ifdef CONFIG_ENABLE_MMUenable_mmu:/* enable domain access */ldr r5, =0x0000ffffmcr p15, 0, r5, c3, c0, 0 /* load domain access register *//* Set the TTB register */ldr r0, _mmu_table_baseldr r1, =CONFIG_SYS_PHY_UBOOT_BASEldr r2, =0xfff00000bic r0, r0, r2orr r1, r0, r1mcr p15, 0, r1, c2, c0, 0/* Enable the MMU */mrc p15, 0, r0, c1, c0, 0orr r0, r0, #1 /* Set CR_M to enable MMU *//* Prepare to enable the MMU */adr r1, skip_hw_initand r1, r1, #0x3fcldr r2, _TEXT_BASEldr r3, =0xfff00000and r2, r2, r3orr r2, r2, r1b mmu_enable.align 5/* Run in a single cache-line */mmu_enable:mcr p15, 0, r0, c1, c0, 0nopnopmov pc, r2#endifskip_hw_init:/* Set up the stack    */stack_setup:ldr r0, =CONFIG_SYS_UBOOT_BASE /* base of copy in DRAM    */sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area                      */sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo                        */sub sp, r0, #12 /* leave 3 words for abort-stack    */clear_bss:ldr r0, _bss_start /* find start of bss segment        */ldr r1, _bss_end /* stop here                        */mov r2, #0 /* clear                            */clbss_l:str r2, [r0] /* clear loop...                    */add r0, r0, #4cmp r0, r1ble clbss_l#ifndef CONFIG_NAND_SPLldr pc, _start_armboot_start_armboot:.word start_armboot#elseb nand_boot/* .word nand_boot*/#endif#ifdef CONFIG_ENABLE_MMU_mmu_table_base:.word mmu_table#endif/* * copy U-Boot to SDRAM and jump to ram (from NAND or OneNAND) * r0: size to be compared * Load 1'st 2blocks to RAM because U-boot's size is larger than 1block(128k) size *///////////////////////////////////////////////////////////////////////////////////////////////////////////////////.globl copy_from_nandcopy_from_nand:mov r10, lr  /* save return address */  mov r9, r0 /* get ready to call C functions */  ldr sp, _TEXT_PHY_BASE /* setup temp stack pointer */sub sp, sp, #12mov fp, #0   /* no previous frame, so fp=0 */mov r9, #0x1000bl copy_uboot_to_ram           3: tst  r0, #0x0  bne copy_failed  ldr r0, =0x0c000000  ldr r1, _TEXT_PHY_BASE1: ldr r3, [r0], #4  ldr r4, [r1], #4teq r3, r4bne compare_failed /* not matched */subs r9, r9, #4bne 1b4: mov lr, r10  /* all is OK */  mov pc, lrcopy_failed:  nop   /* copy from nand failed */  b copy_failedcompare_failed:nop   /* compare failed */b compare_failed #ifndef CONFIG_NAND_SPL/* * we assume that cache operation is done before. (eg. cleanup_before_linux()) * actually, we don't need to do anything about cache if not use d-cache in * U-Boot. So, in this function we clean only MMU. by scsuh * * void theLastJump(void *kernel, int arch_num, uint boot_params); */#ifdef CONFIG_ENABLE_MMU.globl theLastJumptheLastJump:mov r9, r0ldr r3, =0xfff00000ldr r4, _TEXT_PHY_BASEadr r5, phy_last_jumpbic r5, r5, r3orr r5, r5, r4mov pc, r5phy_last_jump:/** disable MMU stuff*/mrc p15, 0, r0, c1, c0, 0bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */orr r0, r0, #0x00000002 /* set bit 2 (A) Align */orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */mcr p15, 0, r0, c1, c0, 0mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */mov r0, #0mov pc, r9#endif/* ************************************************************************* * * Interrupt handling * ************************************************************************* */@@ IRQ stack frame.@#define S_FRAME_SIZE 72#define S_OLD_R0 68#define S_PSR 64#define S_PC 60#define S_LR 56#define S_SP 52#define S_IP 48#define S_FP 44#define S_R10 40#define S_R9 36#define S_R8 32#define S_R7 28#define S_R6 24#define S_R5 20#define S_R4 16#define S_R3 12#define S_R2 8#define S_R1 4#define S_R0 0#define MODE_SVC 0x13#define I_BIT 0x80/* * use bad_save_user_regs for abort/prefetch/undef/swi ... */.macro bad_save_user_regs/* carve out a frame on current user stack */sub sp, sp, #S_FRAME_SIZE/* Save user registers (now in svc mode) r0-r12 */stmia sp, {r0 - r12}ldr r2, _armboot_startsub r2, r2, #(CONFIG_SYS_MALLOC_LEN)/* set base 2 words into abort stack */sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8)/* get values for "aborted" pc and cpsr (into parm regs) */ldmia r2, {r2 - r3}/* grab pointer to old stack */add r0, sp, #S_FRAME_SIZEadd r5, sp, #S_SPmov r1, lr/* save sp_SVC, lr_SVC, pc, cpsr */stmia r5, {r0 - r3}/* save current stack into r0 (param register) */mov r0, sp.endm.macro get_bad_stack/* setup our mode stack (enter in banked mode) */ldr r13, _armboot_start/* move past malloc pool */sub r13, r13, #(CONFIG_SYS_MALLOC_LEN)/* move to reserved a couple spots for abort stack */sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE + 8)/* save caller lr in position 0 of saved stack */str lr, [r13]/* get the spsr */mrs lr, spsr/* save spsr in position 1 of saved stack */str lr, [r13, #4]/* prepare SVC-Mode */mov r13, #MODE_SVC@ msr spsr_c, r13/* switch modes, make sure moves will execute */msr spsr, r13/* capture return pc */mov lr, pc/* jump to next instruction & switch modes. */movs pc, lr.endm.macro get_bad_stack_swi/* space on current stack for scratch reg. */sub r13, r13, #4/* save R0's value. */str r0, [r13]/* get data regions start */ldr r0, _armboot_start/* move past malloc pool */sub r0, r0, #(CONFIG_SYS_MALLOC_LEN)/* move past gbl and a couple spots for abort stack */sub r0, r0, #(CONFIG_SYS_GBL_DATA_SIZE + 8)/* save caller lr in position 0 of saved stack */str lr, [r0]/* get the spsr */mrs r0, spsr/* save spsr in position 1 of saved stack */str lr, [r0, #4]/* restore r0 */ldr r0, [r13]/* pop stack entry */add r13, r13, #4.endm/* * exception handlers */.align 5undefined_instruction:get_bad_stackbad_save_user_regsbl do_undefined_instruction.align 5software_interrupt:get_bad_stack_swibad_save_user_regsbl do_software_interrupt.align 5prefetch_abort:get_bad_stackbad_save_user_regsbl do_prefetch_abort.align 5data_abort:get_bad_stackbad_save_user_regsbl do_data_abort.align 5not_used:get_bad_stackbad_save_user_regsbl do_not_used.align 5irq:get_bad_stackbad_save_user_regsbl do_irq.align 5fiq:get_bad_stackbad_save_user_regsbl do_fiq#endif /* CONFIG_NAND_SPL */

5.在cpu/arm176下，新建文件nand_cp.c

#include <common.h>  #ifdef CONFIG_S3C64XX  #include <asm/io.h>  #include <linux/mtd/nand.h>  #include <asm/arch/s3c6410.h>    static int nandll_read_page (uchar *buf, ulong addr, int large_block)  {       int i;  int page_size = 512;  if (large_block==1)     page_size = 2048;  if (large_block==2)    page_size = 4096;        NAND_ENABLE_CE();        NFCMD_REG = NAND_CMD_READ0;        /* Write Address */        NFADDR_REG = 0;  if (large_block)          NFADDR_REG = 0;  NFADDR_REG = (addr) & 0xff;  NFADDR_REG = (addr >> 8) & 0xff;  NFADDR_REG = (addr >> 16) & 0xff;  if (large_block)    NFCMD_REG = NAND_CMD_READSTART;        NF_TRANSRnB();  /* for compatibility(2460). u32 cannot be used. by scsuh */  for(i=0; i < page_size; i++)  {                *buf++ = NFDATA8_REG;         }        NAND_DISABLE_CE();        return 0;}    static int nandll_read_blocks (ulong dst_addr, ulong size, int large_block)  {       uchar *buf = (uchar *)dst_addr;        int i;  uint page_shift = 9;  if (large_block==1)    page_shift = 11;        /* Read pages */  if(large_block==2)    page_shift = 12;   if(large_block == 2)  {   /* Read pages */    for (i = 0; i < 4; i++, buf+=(1<<(page_shift-1)))  {           nandll_read_page(buf, i, large_block);    }   /* Read pages */    for (i = 4; i < (0x3c000>>page_shift); i++, buf+=(1<<page_shift))   {    nandll_read_page(buf, i, large_block);    }  }  else  {    for (i = 0; i < (0x3c000>>page_shift); i++, buf+=(1<<page_shift))   {            nandll_read_page(buf, i, large_block);    }  }        return 0;}    int copy_uboot_to_ram(void)  {       int large_block = 0;  int i;  vu_char id;         NAND_ENABLE_CE();        NFCMD_REG = NAND_CMD_READID;        NFADDR_REG =  0x00;  /* wait for a while */        for (i=0; i<200; i++);   id = NFDATA8_REG;   id = NFDATA8_REG;  if (id > 0x80)    large_block = 1;  if(id == 0xd5)    large_block = 2; /* read NAND Block.  * 128KB ->240KB because of U-Boot size increase. by scsuh  * So, read 0x3c000 bytes not 0x20000(128KB).  */  return nandll_read_blocks(CONFIG_SYS_PHY_UBOOT_BASE, 0x3c000, large_block);}    #endif   

6.在cpu/arm1176中，修改makefile：

COBJS
= cpu.o nand_cp.o
7.接着进入另一个比较重要的修改地方了，修改include/configs下的smdk6410.h

在#ifndef __CONFIG_H
#define __CONFIG_H 之后添加

#define virt_to_phys(x) virt_to_phy_smdk6410(x)

#define NAND_DISABLE_CE() (NFCONT_REG |= (1 << 1))
#define NAND_ENABLE_CE() (NFCONT_REG &= ~(1 << 1))
#define NF_TRANSRnB()  do { while(!(NFSTAT_REG & (1 << 0))); } while(0)

/*
 * Architecture magic and machine type
 */
//#define MACH_TYPE  1270
#define MACH_TYPE  1626  //这里是定义6410的ID与LINUX内核是相配合的

修改内存值

/*
 * Size of malloc() pool
 */
//#define CONFIG_SYS_MALLOC_LEN  (CONFIG_ENV_SIZE + 1024 * 1024)
#define CONFIG_SYS_MALLOC_LEN  (CONFIG_ENV_SIZE + 512 * 1024)

延迟时间

#define CONFIG_BOOTDELAY 10 

修改SDRAM

//#define CONFIG_SYS_MEMTEST_END  (CONFIG_SYS_SDRAM_BASE + 0x7e00000) /* 126MB in DRAM */
#define CONFIG_SYS_MEMTEST_END  (CONFIG_SYS_SDRAM_BASE + 0x9e00000) /* 126MB in DRAM */ 

修改系统时间

//#define CONFIG_SYS_HZ   1000
#define CONFIG_SYS_HZ   1562500

修改堆栈

/*-----------------------------------------------------------------------
 * Stack sizes
 *
 * The stack sizes are set up in start.S using the settings below
 */
//#define CONFIG_STACKSIZE 0x40000  /* regular stack 256KB */
#define CONFIG_STACKSIZE 0x80000  /* regular stack 512KB */ 

修改NANDFLASH

//#define PHYS_SDRAM_1_SIZE 0x08000000 /* 128 MB in Bank #1 */
#define PHYS_SDRAM_1_SIZE 0x10000000 /* 256 MB in Bank #1 */ 

  Size of Environment Sector 修改

//#define CONFIG_ENV_SIZE  0x4000 /* Total Size of Environment Sector */
#define CONFIG_ENV_SIZE  0x80000 /* Total Size of Environment Sector */

bootcommand修改

#define CONFIG_BOOTCOMMAND "nand read 0xc0018000 0x60000 0x1c0000;" \
    "bootm 0xc0018000"
#else
#define CONFIG_SYS_MAPPED_RAM_BASE CONFIG_SYS_SDRAM_BASE
//#define CONFIG_BOOTCOMMAND "nand read 0x50018000 0x60000 0x1c0000;" \
//    "bootm 0x50018000"
#define CONFIG_BOOTCOMMAND "nand read 0x50018000 0x100000 0x500000;" \
    "bootm 0x50018000"
#endif 

 修改段偏移地址

#define CONFIG_ENV_OFFSET  0x0080000 

页大小

/* NAND chip page size  */
//#define CONFIG_SYS_NAND_PAGE_SIZE 2048
#define CONFIG_SYS_NAND_PAGE_SIZE 4096 

块大小

/* NAND chip block size  */
//#define CONFIG_SYS_NAND_BLOCK_SIZE (128 * 1024)
#define CONFIG_SYS_NAND_BLOCK_SIZE (512 * 1024)

校验位

/* NAND chip page per block count  */
//#define CONFIG_SYS_NAND_PAGE_COUNT 64
#define CONFIG_SYS_NAND_PAGE_COUNT 128 

 

--------------------------------------

在u-boot-nand.lds 中添加：
{
cpu/arm1176/start.o (.text)
cpu/arm1176/s3c64xx/cpu_init.o (.text)
board/samsung/smdk6410/lowlevel_init.o (.text)
cpu/arm1176/nand_cp.o (.text)
lib_arm/board.o (.text)
*(.text)
}
在u-boot.lds 中添加：
{
cpu/arm1176/start.o(.text)
cpu/arm1176/s3c64xx/cpu_init.o (.text)
board/samsung/smdk6410/lowlevel_init.o (.text)
cpu/arm1176/nand_cp.o (.text)
lib_arm/board.o (.text)
*(.text)
}

进入nand_spl/board/ 复制一个smdk6400 为smdk6410，同理修改全部6400为6410

进入makefile：
COBJS = nand_boot.o nand_ecc.o s3c64xx.o nand_cp.o
在下面代码
# from SoC directory
$(obj)cpu_init.S:
@rm -f $@
@ln -s $(TOPDIR)/cpu/arm1176/s3c64xx/cpu_init.S $@
之后添加
$(obj)nand_cp.c:
@rm -f $@
@ln -s $(TOPDIR)/cpu/arm1176/nand_cp.c $@

 

8.接下来是DM9000网卡移植，为什么要移植这个呢，因为没有这个你怎么烧文件系统怎么烧内核啊，貌似跑偏了，得先有nand驱动才能烧

//#define CONFIG_NET_MULTI
//#define CONFIG_CS8900 /* we have a CS8900 on-board */
//#define CONFIG_CS8900_BASE 0x18800300
//#define CONFIG_CS8900_BUS16 /* follow the Linux driver */
然后添加DM9000 网卡的宏定义：
/*-----------------------------------------------------*//* by 2012-4-10 */
#define CONFIG_NET_MULTI 1
#define CONFIG_DM9000_NO_SROM 1
#define CONFIG_dm9000
#define CONFIG_DRIVER_DM9000 1
#define CONFIG_DM9000_BASE 0x18800300
#define DM9000_IO CONFIG_DM9000_BASE
#define DM9000_DATA (CONFIG_DM9000_BASE+4)
#define CONFIG_DM9000_USE_16BIT
#define CONFIG_ETHADDR 00:40:5c:26:0a:5b
#define CONFIG_NETMASK 255.255.255.0
#define CONFIG_IPADDR 172.16.114.20
#define CONFIG_SERVERIP 172.16.114.10
#define CONFIG_GATEWAYIP 172.16.114.1
//#define CONFIG_DM9000_DEBUG
上面的IP 和网关、子网掩码等根据自己的具体情况进行修改。
接着打开u-boot-2010.03/net/eth.c,并且进入到函数int

eth_initialize(bd_t *bis)中，在：
#if defined(CONFIG_DB64460) || defined(CONFIG_P3Mx)
mv6446x_eth_initialize(bis);
#endif
后面添加下面代码：
/*-----------------------------------*/
/* by 2012-4-10 */
#if defined(CONFIG_DRIVER_DM9000)
dm9000_initialize(bis);
#endif
/*-----------------------------------*/

同样在u-boot-2010.03/net/net.c，
1.将//# define ARP_TIMEOUT 5000UL /* Milliseconds before trying ARP again */
修改成：
# define ARP_TIMEOUT 5 /* Milliseconds before trying ARP again */
2.将if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT)
修改成：
if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT*CONFIG_SYS_HZ)
3.将//NetSetTimeout (10000UL, PingTimeout);
修改成：
NetSetTimeout (10*CONFIG_SYS_HZ, PingTimeout);

接着进入u-boot-2010.03/net/tftp.c，找到void
TftpStart (void)函数，用#if 0 #endif 注释掉下面的程序：
#if 0
/*
* Allow the user to choose TFTP blocksize and timeout.
* TFTP protocol has a minimal timeout of 1 second.
*/
if ((ep = getenv("tftpblocksize")) != NULL)
TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
if ((ep = getenv("tftptimeout")) != NULL)
TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
if (TftpTimeoutMSecs < 1000) {
printf("TFTP timeout (%ld ms) too low, "
"set minimum = 1000 ms\n",
TftpTimeoutMSecs);
TftpTimeoutMSecs = 1000;
}
debug("TFTP blocksize = %i, timeout = %ld ms\n",

TftpBlkSizeOption, TftpTimeoutMSecs);
#endif

 

进入dm9000x.c，找到static int dm9000_rx(struct eth_device *netdev)
函数，把for(;;){}修改成do{}while.
在do 之前添加：
/*------------------------------------*/
/*2012-4-17*/
DM9000_ior(DM9000_MRRH);
DM9000_ior(DM9000_MRRL);
/*-------------------------------------*/
static void dm9000_halt(struct eth_device *netdev)
{
DM9000_DBG("%s\n", __func__);
/* RESET devie */
//phy_write(0, 0x8000); /* PHY RESET */
//DM9000_iow(DM9000_GPR, 0x01); /* Power-Down PHY */
//DM9000_iow(DM9000_IMR, 0x80); /* Disable all interrupt */
//DM9000_iow(DM9000_RCR, 0x00); /* Disable RX */
}

 

关于网卡驱动的一个bug问题极其解决

ping功能的实现，通过上步得到的uboot使用 ping 时进入循环，不得而出，下面解决此问题。

原因：u-boot.2010.03/net/net.c文件中NetLoop()函数中，数次引用get_timer(0)，来计算超时与否，而get_timer(0)总是返回0，因此需要修改get_timer()函数。打开u-boot.2010.03/cpu/arm1176/s3c64xx/timer.c

ulong get_timer(ulong base)

{

return get_timer_masked() - base;

}

此函数并没有什么问题，进入get_timer_masked()，查看

ulong get_timer_masked(void)

{

unsigned long long res = get_ticks();

do_div (res, (timer_load_val / (100 * CONFIG_SYS_HZ)));

return res;

}

get_timer()为0，完全是由于do_div引起的，修改成如下：

ulong get_timer_masked(void)

{

ulong now = read_timer();

if (lastdec >= now) {

/* normal mode */

timestamp += lastdec - now;

} else {

/* we have an overflow ... */

timestamp += lastdec + timer_load_val - now;

}

lastdec = now;

return timestamp;

}

ok，到此解决了ping时进入死循环不出来的bug。但是仍然ping不通。根据打印信息，此时只发了一次包。而ping的原理是：先发一个包（此包中目的ip的mac地址为空，因为此时知道目的ip但不知目的mac），目的主机会做出回应，在dm9000接受到后，上层NetReceive（）会把目的主机的mac地址封装到包里，再次发送。

还有几处 添加初始化代码。在board/samsung/SMDK6410/SMDK6410.C

#ifdef CONFIG_CMD_NET
int board_eth_init(bd_t *bis)
{
 int rc = 0;
#ifdef CONFIG_DRIVER_DM9000
 rc = dm9000_initialize(bis);

#endif
 return rc;
}

#gedit drivers/net/dm9000x.c

#if 0  //屏蔽掉dm9000_init函数中的这一部分，不然使用网卡的时候会报“could not establish link”的错误
    i = 0;
    while (!(phy_read(1)& 0x20)){    /* autonegation complete bit */
        udelay(1000);
        i++;
        if (i== 10000){
            printf("could not establish link ");
            return 0;
        }
    }
#endif

、、、、、还有大家注意这个网卡驱动ping的时候是很慢的，1-2分钟。有系统和没系统速度相差还是很大的，一般第一次ping不通后来就通了；还有就是用tftp命令连接超快，10秒左右，不知道为什么。。。

 

 9.现在到了最烦人的地方了，添加对yaffs2文件系统的支持，到这里大家估计都不耐烦了吧，坚持一会，最后一步了。

1. 修改include/configs

 #define CONFIG_BOOTDELAY 2

#define CONFIG_BOOTARGS     "root=/dev/mtdblock2 rootfstype=yaffs2 console=ttySAC0,115200"

 

 关于yaffs2移植这篇文献讲得比较好。大家直接按照它来就行点击打开链接,然后结合这篇博客点击打开链接

 

 

小结，移植到此结束，这次移植主要完成了几个任务：板载信息修改，nand驱动修改及移植，DM9000网卡移植，添加yaffs2文件系统支持，引导内核。uboot有这些个功能足够了呵呵，后期我会对这些代码详细注释，要知其所以然。明天我会根据这个文档进行重新移植，其中的错误我我会改出来，遇到的bug也会提交到这个文档中。下面进入内核移植篇