直接從nandflash和T卡啟動(dòng)linux的筆記

1、實(shí)現(xiàn)從nand flash和T卡啟動(dòng)功能所做的修改1、 讓系統(tǒng)可以正確讀取T卡中的文件需要修改uboot/include/movi.h文件中關(guān)于MOVI_BL2_POS的定義，具體如下：/#define MOVI_BL2_POS(MOVI_LAST_BLKPOS - MOVI_BL1_BLKCNT - MOVI_BL2_BLKCNT) - MOVI_ENV_BLKCNT)#define MOVI_BL2_POS(MOVI_LAST_BLKPOS - MOVI_BL1_BLKCNT - MOVI_BL2_BLKCNT)/ - MOVI_ENV_BLKCNT)2、 需要打開(kāi)include/conf

2、igs/smdk6410.h中的下面幾個(gè)配置，否則在讀取nandflash時(shí)會(huì)有問(wèn)題。CFG_NAND_HWECCCFG_NAND_FLASH_BBTCONFIG_NAND_BL1_8BIT_ECC3、 在uboot/cpu/s3c64xx/nand.c中添加對(duì)nand flash第一塊進(jìn)行讀寫(xiě)的函數(shù)如下：void s3c_nand_write_page_8bit_for_irom(struct mtd_info *mtd, struct nand_chip *chip, const uint8_t *buf)int i, eccsize = 512;int eccbytes = 13;int

3、 eccsteps = mtd->writesize / eccsize;uint8_t *ecc_calc = chip->buffers->ecccalc;uint8_t *p = (uint8_t *) buf;for (i = 0; eccsteps; eccsteps-, i += eccbytes, p += eccsize) s3c_nand_enable_hwecc_8bit(mtd, NAND_ECC_WRITE);chip->write_buf(mtd, p, eccsize);s3c_nand_calculate_ecc_8bit(mtd, p,

4、&ecc_calci);for (i = 0; i < eccbytes * (mtd->writesize / eccsize); i+)chip->oob_poii = ecc_calci;chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);int s3c_nand_read_page_8bit_for_irom(struct mtd_info *mtd, struct nand_chip *chip, uint8_t *buf)int i, stat, eccsize = chip->ecc

5、.size;int eccbytes = chip->ecc.bytes;int eccsteps = chip->ecc.steps;int col = 0;uint8_t *p = buf;uint32_t *mecc_pos = chip->ecc.layout->eccpos;/* Step1: read whole oob */col = mtd->writesize;chip->cmdfunc(mtd, NAND_CMD_RNDOUT, col, -1);chip->read_buf(mtd, chip->oob_poi, mtd-&

6、gt;oobsize);col = 0;for (i = 0; eccsteps; eccsteps-, i += eccbytes, p += eccsize) chip->cmdfunc(mtd, NAND_CMD_RNDOUT, col, -1);chip->ecc.hwctl(mtd, NAND_ECC_READ);chip->read_buf(mtd, p, eccsize);chip->write_buf(mtd, chip->oob_poi + 0 + (chip->ecc.steps - eccsteps) * eccbytes), eccb

7、ytes);s3c_nand_calculate_ecc_8bit(mtd, 0, 0);stat = s3c_nand_correct_data_8bit(mtd, p, 0, 0);if (stat = -1)mtd->ecc_stats.failed+;col = eccsize * (chip->ecc.steps + 1 - eccsteps);return 0;4、 修改uboot/cpu/s3c64xx/nand_cp.c中的nand_bl2_copy()和and_bl2_copy_adv()兩個(gè)函數(shù)如下：void nand_bl2_copy(void)int blo

8、ck, page;volatile uint *base = (uint *) 0x57e00000;/miaozh modify#if0for (block = 0; block < 16; block+) for (page = 0; page < 32; page+) NF8_ReadPage(block, page, (uchar *)base);base += (512 / (sizeof(uint);#elsefor (block = 0; block < 1; block+) for (page = 0; page <128 ; page+) NF8_Re

9、adPage_Adv(block, page, (uchar *)base);base += (4096 / (sizeof(uint);#endifvoid nand_bl2_copy_adv(void)int block, page;volatile uint *base = (uint *) 0x57e00000;/miaozh modify#if0for (block = 0; block < 2; block+) for (page = 0; page < 128; page+) NF8_ReadPage_Adv(block, page, (uchar *) base);

10、base += (2048 / (sizeof(uint);#elsefor (block = 0; block < 1; block+) for (page = 0; page < 128; page+) NF8_ReadPage_Adv(block, page, (uchar *) base);base += (4096 / (sizeof(uint);#endif5、 修改uboot/cpu/s3c64xx/nand_cp.c中的nandll_read_page ()和nandll_read_blocks ()兩個(gè)函數(shù)如下：static int nandll_read_pag

11、e (uchar *buf, ulong addr, int large_block) int i;int page_size = 512;if (large_block)page_size = 2048;/miaozh addpage_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 >&

12、gt; 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;/* * Read data from NAND. */static int

13、 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)page_shift = 11;/miaozh addpage_shift = 12; /* Read pages */ for (i = 0; i < (0x3c000>>page_shift); i+, buf+=(1<<page_shift) nandll_read_page(buf

14、, i, large_block); return 0;6、 修改uboot/drivers/mtd/nand/nand_base.c中的nand_do_read_ops()函數(shù)如下：/miaozh modify#if0if (mtd->writesize = 512 && page < 512) | (mtd->writesize = 2048 && page < 128) s3c_nand_read_page_8bit(mtd, chip, bufpoi); #else if (mtd->writesize = 512 &

15、;& page < 512) | (mtd->writesize = 2048 && page < 128) |(mtd->writesize = 4096 && page < 128) s3c_nand_read_page_8bit_for_irom(mtd, chip, bufpoi);#endif7、 修改uboot/drivers/mtd/nand/nand_base.c中的nand_write_page ()函數(shù)如下：/miaozh modify#if0if (mtd->writesize = 512 &am

16、p;& page < 512) | (mtd->writesize = 2048 && page < 128) memset(chip->oob_poi, 0xff, mtd->oobsize);s3c_nand_write_page_8bit(mtd, chip, buf);#elseif (mtd->writesize = 512 && page < 512) | (mtd->writesize = 2048 && page < 128) | (mtd->writesize

17、= 4096 && page < 128) memset(chip->oob_poi, 0xff, mtd->oobsize);s3c_nand_write_page_8bit_for_irom(mtd, chip, buf);#endif8、 在drivers/mtd/nand/nand_util.c文件的nand_write_opts()函數(shù)中對(duì)應(yīng)地方添加如下內(nèi)容/* make sure device page sizes are valid */if (!(meminfo->oobsize = 16 && meminfo->w

18、ritesize = 512) && !(meminfo->oobsize = 8 && meminfo->writesize = 256) && !(meminfo->oobsize = 64 && meminfo->writesize = 2048) /*miaozh add*/ &&!(meminfo->oobsize = 218 && meminfo->writesize = 4096) ) printf("Unknown flash (not

19、normal NAND)n");return -1;9、 在drivers/mtd/nand/nand_util.c文件的nand_write_opts()函數(shù)中對(duì)應(yīng)地方添加如下內(nèi)容/* make sure device page sizes are valid */if (!(meminfo->oobsize = 16 && meminfo->writesize = 512) && !(meminfo->oobsize = 8 && meminfo->writesize = 256) && !(

20、meminfo->oobsize = 64 && meminfo->writesize = 2048)/*miaozh add*/ &&!(meminfo->oobsize = 218 && meminfo->writesize = 4096) ) printf("Unknown flash (not normal NAND)n");return -1;10、 在文件uboot/common/dlmalloc.c中添加下面的函數(shù)/miaozh addvoid init_sbrk_base(void)un

21、signed int *ptr;sbrk_base = (char*)(-1);top = initial_top;ptr = (unsigned int *)top;11、 修改uboot/lib_arm/board.c中的mem_malloc_init()函數(shù)staticvoid mem_malloc_init (ulong dest_addr)/printf("mem_malloc_init dest_addr=0x%08xn", dest_addr);mem_malloc_start = dest_addr;mem_malloc_end = dest_addr +

22、CFG_MALLOC_LEN;mem_malloc_brk = mem_malloc_start;memset (void *) mem_malloc_start, 0, mem_malloc_end - mem_malloc_start);/miaozh addinit_sbrk_base();12、 在uboot/lib_arm/board.c中添加set_gpk8()函數(shù)/miaozh add for dnwvoid set_gpk8(void)unsigned int tmp;tmp = readl(ELFIN_GPIO_BASE+GPKCON1_OFFSET);tmp = tmp &

23、amp;(0xf);tmp |= 1;writel(tmp, ELFIN_GPIO_BASE+GPKCON1_OFFSET);tmp = readl(ELFIN_GPIO_BASE+GPKPUD_OFFSET);tmp = tmp &(0x3<<16);writel(tmp, ELFIN_GPIO_BASE+GPKPUD_OFFSET);tmp = readl(ELFIN_GPIO_BASE+GPKDAT_OFFSET);tmp |= (0x1 << 8);writel(tmp, ELFIN_GPIO_BASE+GPKDAT_OFFSET);/end13、 在u

24、boot/common/cmd_nand.c中修改do_nand函數(shù)相應(yīng)地方如下：/miaozh modify#if0if (read)ret = nand_read(nand, off, &size, (u_char *)addr);else ret = nand_write(nand, off, &size, (u_char *)addr);if (ret = 0) uint *magic = (uint*)(PHYS_SDRAM_1);if (0x24564236 = magic0) && (0x20764316 = magic1)magic0 = 0x27051956;#elseif (read) nand_read_options_t opts;memset(&opts, 0, sizeof(opts);opts.buffer= (u_char*) addr;opts.length= size;opts.offset= off;opts.quiet = quiet;ret = nand_read_opts(nand, &opts); else nand_write_options_t opts;memset(&opts, 0, sizeof(opts)