bootloader---23.u-boot-2010.06-rc1移植之3nand flash移植

发布时间：2020-12-15 20:00:53 所属栏目：百科来源：网络整理

导读：增加nand flash 特性当可以正常启动serial可以显示之后，接下来移植nand flash 1. nand flash的初始化是在 arch/arm/lib/board.c中 arch / arm / lib / board . c? start_armboot? { ????# if ?defined ( CONFIG_CMD_NAND ) ???? ????puts? ( "NAND: " ) ;

增加nand flash 特性

当可以正常启动serial可以显示之后，接下来移植nand flash

1. nand flash的初始化是在 arch/arm/lib/board.c中

 
   arch/arm/lib/board.c?

 start_armboot?

 {

 ????#if?defined(CONFIG_CMD_NAND)????

 ????puts?("NAND: ");

 ????nand_init(;????????/*?go init the NAND?*/

 ????#endif

 }

所以需要在include/configs/smdk2410.h中添加: ? #define CONFIG_CMD_NAND ??1

2.nand的初始化

#ifndef CONFIG_SYS_NAND_BASE_LIST

#define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }

#endif

static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;

//base_address初始化为CONFIG_SYS_NAND_BASE

所以需要在include/configs/smdk2410.h中添加:?#define CONFIG_SYS_NAND_BASE??0x4E000000

void nand_init(void)

{

????int?i;

????unsigned?int?size?=?0;

????for?(i?;?i?<?CONFIG_SYS_MAX_NAND_DEVICE;?i+)?

? ? {?

//CONFIG_SYS_MAX_NAND_DEVICE=1所以只需要进行一次nand_init_chip

//初始化nand的

? ? ? ? nand_init_chip&nand_info[i],?&nand_chip;

????????size?=?nand_info.size?/?1024;

????????if?(nand_curr_device?==?-1)

????????????nand_curr_device?=?i}

????printf"%u MiBn";

}

3. driver/mtd/nand/nand.c L42

(

???????????? ulong base_addr)
{
????int?maxchips?=?CONFIG_SYS_NAND_MAX_CHIPS;
????int?__attribute__(unused)?i?;
????(maxchips?<?1)
????????maxchips?=?1;
????mtd->priv?=?nand; //以后要用到nand来控制底层寄存器,这儿先保存起nand来,这个非常重要
????nand>IO_ADDR_R?>IO_ADDR_W?(void __iomem?)base_addr;//初始化读写指针为0x4E000000,以后真正读写时指针要改变
????(board_nand_init(nand)?{ //board_nand_init寄存器纸别的初始化
????????(nand_scan(mtd{ //
????????????!mtd>name)
????????????????mtd>name?(char?)default_nand_name;
? ? ? ??}?else
????????????mtdNULL;
????else?{
????????mtd;
????????mtd>size?}
}

4. drivers/mtd/nand/s3c2410_nand.c

int?board_nand_init(struct nand_chip?)

{

????u_int32_t cfg;

????u_int32_t cnt;

????u_int8_t tacls?twrph1;

????struct s3c2440_nand?*nand_reg?=?s3c2440_get_base_nand;

????debugX(1"board_nand_init()n";

? ??*?initialize hardware?/

????tacls?;

????twrph0?=?4;

????twrph1?=?2;

????cfg?|=?S3C2440_NFCONF_TACLS(tacls;

????cfg?=?S3C2440_NFCONF_TWRPH0(twrph0=?S3C2440_NFCONF_TWRPH1(twrph1;

????writel(cfg&nand_reg>NFCONF/NAND Flash control register

????/bit6:?Lock spare ECC

????/bit4:?Initialize ECC decoder/encoder

????/bit1:?enable chip_select

????/bit0:?nand_enable

????cnt =(1<<6)| (1<<4)|(0<<1)|(1<<0);

????writel(cnt,&nand_reg->NFCONT); //不仅需要配寄存器NFCONF,而且需要配寄存器NFCONT

? ? ??

? ? ??//以下初始化函数指针

????*?initialize nand_chip data structure?/
????nand(void?>NFDATA;
????nand>select_chip?=?s3c2440_nand_select_chip*?hwcontrol always must be implemented?>cmd_ctrl?=?s3c2440_hwcontrol>dev_ready?=?s3c2440_dev_ready>ecc.mode?=?NAND_ECC_SOFT //进行软件的ECC校验
????nand>options? //BUS_WIDTH 8位
????debugX"end of nand_initn";
????return 0;
}

这儿调用了s3c2440_get_base_nand,需要在include/asm/arch-s3c24x0/s3c2410.h中添加这个函数

#define S3C24X0_NAND_BASE????????0x4E000000

static inline struct s3c2440_nand *s3c2440_get_base_nand(void)

{

????return (struct s3c2440_nand *)S3C24X0_NAND_BASE;

}

同时 S3C2440_NFCONF_TACLS等这几个宏跟手册上的位置不匹配,所以修改一下

#define S3C2440_NFCONF_TACLS(x)? <<12)

#define S3C2440_NFCONF_TWRPH0 <8)

#define S3C2440_NFCONF_TWRPH1<4)

#define S3C2440_NFCONT_nCE ????<1)

#define S3C2440_NFCONT_MODE_DISABLE????(0<0)

#define S3C2440_NFCONT_MODE_ENABLE????)

#define S3C2440_NFSTAT_READY ????)

#define S3C2440_ADDR_NALE? 0x0C

#define S3C2440_ADDR_NCLE? 0x08

5. driver/mtd/nand/nand_base.c L3061

start_armboot-> nand_init->nand_init_chip

int?nand_scanint?maxchipsint?ret;

????ret?=?nand_scan_ident!ret)

????????ret?=?nand_scan_tail;

????return ret}

6. driver/mtd/nand/nand_base.c ? ?L2770

start_armboot-> nand_init->nand_init_chip->nand_scan

int?nand_scan_ident?nand_maf_id;

????struct nand_chip?*chip?=?mtd>priv;//函数nand_init_chip中保存的nand_chip结构体

????struct nand_flash_dev?*type*?Get?buswidth?to?select?the correct functions?/

????busw?=?chip&?NAND_BUSWIDTH_16

????Set?the default functions?/

????nand_set_defaults(chip //对nand_chip结构体进一步初始化

????*?Read the flash type?/

????type?=?nand_get_flash_type&nand_maf_id(IS_ERR(type{

#ifndef CONFIG_SYS_NAND_QUIET_TEST

????????printk(KERN_WARNING?"No NAND device found!!!n";

#endif

????????chip>select_chip;

????????return PTR_ERR}

????*?Check?for?a chip?array?/

????<?maxchips{

????????chip;

????????*?See comment?in?nand_get_flash_type?for?reset?/

????????chip>cmdfunc*?Send the command?for?reading device ID??0x00*?Read manufacturer?and?device IDs?/

????????(nand_maf_id?!>read_byte|

???????? type>id?)

????????????break}

#ifdef DEBUG

????>?1)

????????printk(KERN_INFO?"%d NAND chips detectedn";

#endif

????*?Store the number of chips?and?calc total size?for?mtd?/

????chip>numchips?=?i?*?chip>chipsize}

6. driver/mtd/nand/nand_base.c ? ?L2555

start_armboot>?nand_init>nand_init_chip>nand_scan-->nand_scan_ident

//设置默认的函数指针

static void nand_set_defaults*chipint?busw{

????*?check?for?proper chip_delay setupset?20us?not?!chip>chip_delay)

????????chip>chip_delay?=?20 //设置延时=20

????*?checkif?a user supplied command?function?given?>cmdfunc?=?nand_command //cmd_func=nand_command,以后就靠它发命令了

????if?a user supplied wait?>waitfunc?=?nand_wait //nand_wait

????=?nand_select_chip //不进入

????>read_byte?=?busw???nand_read_byte16?:?nand_read_byte; //read_byte=nand_read_byte

????>read_word>read_word?=?nand_read_word //read_word=nand_read_word

????>block_bad>block_bad?=?nand_block_bad>block_markbad>block_markbad?=?nand_default_block_markbad>write_buf>write_buf???nand_write_buf16?:?nand_write_buf>read_buf>read_buf???nand_read_buf16?:?nand_read_buf>verify_buf>verify_buf???nand_verify_buf16?:?nand_verify_buf>scan_bbt>scan_bbt?=?nand_default_bbt>controller>controller?&chip>hwcontrol;

????????*?XXX U-BOOT XXX?/

#if?0

????????spin_lock_init>lock;

????????init_waitqueue_head>wq;

#endif

????}

7.??driver/mtd/nand/nand_base.c ? ?L2603

?Get?the flash?and?manufacturer id?and?lookup?if?the type?is?supported

static struct nand_flash_dev?*nand_get_flash_typeint?*maf_id)

{

????struct nand_flash_dev?*type??maf_idxint?tmp_id;

? ? ? //以下是读取设备ID的过程:参见K9F2G08U0B的datasheet

? ? ? //1. 发送命令0x90 ? 2.发送地址0x00 ?3.读取第一个字节为manufacturer 第二个字节为DEV_ID??

?????*?Reset the chip(e.g.?Micron MT29FxGxxxxx)
?????*?after power-up
?????/
? ? //调用nand_command-->s3c2440_hwcontrol向nandflash的NFCMMD寄存器发送0xFF(RESET指令)
????chip? ??//1. 发送命令0x90 ? 2.发送地址0x00 ? ?
????chip? ? //返回的第一个字节为0xEC 第二个字节为0xDA
????*maf_id?;
????dev_id?*?Try again?to?make sure-hold?or?other
?????*?interface concerns can cause random data which looks like a
?????*?possibly credible NAND flash?to?appear.?If?the two results?do
?????not?match.
?????? ? ?//重新读取,验证第一次读取的结果是正确的
????chip/
????tmp_manf?;
????tmp_id?(tmp_manf?|?tmp_id?=?dev_id{
????????printk"%s: second ID read did not match "
?????????"%02x,%02x against %02x,%02xn"
?????????;
????????return ERR_PTR-ENODEV}
? ? //从nand_flash_ids表中查找 id=0xDA的项
? ? // ? name ? ? ? ? ? ? ? ? ? ? ?id ??pagesize?chipsize?erasesize?options
? ? //? {"NAND 256MiB 3,3V 8-bit",?0xDA,? ? ? ?256,? ? 0,? ? ? LP_OPTIONS},
????*?Lookup the flash id?;?nand_flash_ids.name?{
????????(dev_id?=?nand_flash_ids.id{
????????????type?&nand_flash_ids;
????????????break}
????!type)
????????return ERR_PTR)
????????mtd=?type
? ? //设定chipsize=256M=256<<20
????chip>chipsize?(uint64_t)type<?20*?Newer devices have all the information?in?additional id bytes?>pagesize{
//根据K9F2G08U0B的datasheet P29
????????int?extid*?The 3rd id byte holds MLC?/?multichip data?>cellinfo? //cellinfo=0x10
????????*?The 4th id byte?is?the important one?/
????????extid? //extid=0x95
????????* Calc pagesize,extid的D0-D1是pagesize*/
????????mtd>writesize?=?1024?<?(extid?&?0x3;
????????extid?>/* Calc oobsize ?extid的D2位的单位是byte/512byte,所以求oob,需要乘pagesize/512?*/
????????mtd>oobsize?(8?&?0x01>?9;
????????/* Calc blocksize. Blocksize is multiples of 64KiB,求block_size,exit的D4-D5位是1的话对应128K的block_size*/
????????mtd>erasesize?(64?*?1024&?0x03/* Get buswidth information: extid的D6位是buswidth 0--8位的buswidth?*/
????????busw???NAND_BUSWIDTH_16?:?0*
?????????*?Old devices have chip data hardcoded?in?the device id table
?????????/
????????mtd>erasesize/?32;
????????busw?*?Try?to?identify manufacturer?(maf_idx?;?nand_manuf_ids[maf_idx.id?=?0x0;?maf_idx(nand_manuf_ids*?Checkif?buswidth?is?correct.?Hardware drivers should?set
?????*?chip correct?!
?????(busw?"NAND device: Manufacturer ID:"
?????????" 0x%02x,Chip ID: 0x%02x (%s %s)n"
???????? dev_id.name;
????????printk"NAND bus width %d instead %d bitn"??16?:?8
???????? busw?-EINVAL*?Calculate the address shift from the page size?>page_shift?=?ffs>writesize-?1*?Convert chipsize?to?number of pages per chip?>pagemask?>?chip>page_shift;
????chip>bbt_erase_shift?>phys_erase_shift?=
????????ffs&?0xffffffff>chip_shift?(unsigned)chipelse
????????chip>?32+?31Set?the bad block position?>badblockpos?>?512??
????????NAND_LARGE_BADBLOCK_POS?:?NAND_SMALL_BADBLOCK_POSGet?chip options&~NAND_CHIPOPTIONS_MSK;
????chip&?NAND_CHIPOPTIONS_MSKSet?chip as a default.?Board drivers can override itif?necessary
?????=?NAND_NO_AUTOINCRif?chip?is?a?not?a samsung deviceDo?not?clear the
?????*?options?for?chips which are?not?having an extended id=?NAND_MFR_SAMSUNG?&?~NAND_SAMSUNG_LP_OPTIONSAND?chips with 4 page planes?&?NAND_4PAGE_ARRAY>erase_cmd?=?multi_erase_cmd=?single_erase_cmdnot?replace?user supplied command?function?!?&?chip=?nand_command_lp;
????MTDDEBUG?(MTD_DEBUG_LEVEL0"NAND device: Manufacturer ID:"
?????
???? nand_manuf_ids;
????return type}

2. 在include/configs/smdk2410.h中添加

#define CONFIG_CMD_NAND ?? 1

#define CONFIG_SYS_MAX_NAND_DEVICE ? 1

#define CONFIG_SYS_NAND_BASE ??? 0x4E000000

3.start_armboot--> nand_init 在driver/mtd/nand/nand.c中

nand_init-->nand_init_chip-->board_nand_init

4. board_nand_init函数在driver/mtd/nand/s3c2410_nand.c中

不过这需要在?include/configs/smdk2410.h中添加

#define CONFIG_NAND_S3C2410 1

5.删除多余的文件

root@ubuntu:~/u-boot-2010.06-rc1/drivers/mtd/nand# rm atmel_nand.c bfin_nand.c davinci_nand.c fsl_elbc_nand.c fsl_upm.c kb9202_nand.c kirkwood_nand.c kmeter1_nand.c mpc5121_nfc.c mxc_nand.c ndfc.c nomadik.c ?s3c64xx.c spr_nand.c omap_gpmc.c nand_plat.c?

同时在driver/mtd/nand/Makefile中删除多余的东东，不删也没有关系。

root@ubuntu:~/uboot/u-boot-2010.06-rc1# vi drivers/mtd/nand/Makefile?

6. 这里候就可以编译通过了，不过打印的是

DRAM: ?64 MiB

Flash: 512 KiB

NAND: ?No NAND device found!!!

0 MiB

*** Warning - bad CRC,using default environment

7. 修改一下driver/mtd/nand/s3c2410_nand.c中的board_nand_init函数

a.将driver/mtd/nand/s3c2410_nand.c中所有的2410替换为2440

8. 在include/asm/arch-s3c24x0/s3c2410.h中添加

#define S3C24X0_NAND_BASE 0x4E000000

static inline struct s3c2440_nand *s3c2440_get_base_nand(void)

{

return (struct s3c2440_nand *)S3C24X0_NAND_BASE;

}

9.?在driver/mtd/nand/s3c2410_nand.c中

 
     )
 {

 ????u_int32_t cfg;

 ????u_int32_t cnt;

 ????u_int8_t tacls;

 ????struct s3c2440_nand?;

 ????debugX;

 ????/writel(readl&clk_power>CLKCON|?(1?<?4/

 ????tacls?;

 ????twrph0?;

 ????twrph1?;

 ????cfg?;

 ????cfg?;

 ????writel/NAND Flash control register

 ????:?Lock spare ECC

 ????/encoder

 ????:?enable chip_select

 ????:?nand_enable

 ????cnt?<6(cnt>NFCONT/

 ????nand;

 ????nand;

 ????return 0;

 }

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!