分类: LINUX
2013-02-15 14:16:13
1.完善saveenv功能(ENV保存于NAND Flash)
在执行saveenv命令时,出现“MTD Erase failure: -22”的问题
原因是erase是nand的整个block,而设置的CONFIG_ENV_SIZE小于block。于是设置:
#define CONFIG_ENV_OFFSET 0x0080000
#define CONFIG_ENV_SIZE 0x80000
该问题解决了,但启动后一直出现“bad CRC,using default environment”
通过查找发现,uboot没有找到复制到CONFIG_NAND_ENV_DST处的环境变量。
我的uboot image放在NAND的第一个BLOCK(512K),而ENV放在第二块BLOCK。
系统启动第一阶段时env_init会查找指到CONFIG_NAND_ENV_DST处的环境变量,如果没有找到则gd->env_valid=0
系统启动第二阶段的env_relocat根据gd->env_valid=0而env_set_defaut("!bad CRC");
再来看nand启动的nand_boot函数,该函数里面只有
nandll_read_blocks(CONFIG_SYS_PHY_UBOOT_BASE,CONFIG_SYS_UBOOT_SIZE, CONFIG_SYS_NAND_PAGE_SIZE);
进一步发现nand_boot启动过程只复制了第一个block到内存(uboot image),所以还需要 把第二个block也复制到内存CONFIG_NAND_ENV_DST处。
修改nand_boot.c中几个函数,内容如下:
#include重新启动后,bad CRC的提示没有了。#include #include #include #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) static void nandll_read_page (uchar *buf, ulong addr, uint nand_page_size) { int i; /* int page_size = 512; if (large_block==1) page_size = 2048; if (large_block==2) page_size = 4096; if(large_block==3) page_size = 8192; */ NAND_ENABLE_CE(); NFCMD_REG = NAND_CMD_READ0; /* Write Address */ NFADDR_REG = 0; if (nand_page_size>=2048) NFADDR_REG = 0; NFADDR_REG = (addr) & 0xff; NFADDR_REG = (addr >> 8) & 0xff; NFADDR_REG = (addr >> 16) & 0xff; if (nand_page_size>=2048) NFCMD_REG = NAND_CMD_READSTART; NF_TRANSRnB(); /* for compatibility(2460). u32 cannot be used. by scsuh */ for(i=0; i < nand_page_size; i++) { *buf++ = NFDATA8_REG; } NAND_DISABLE_CE(); //return 0; } /* * Read data from NAND. */ static void nandll_read_blocks (ulong dst_addr, ulong offs,ulong read_size, uint nand_page_size) { unsigned char *buf = (unsigned char *)dst_addr; unsigned i; unsigned page_shift = 9; unsigned int block, lastblock; unsigned int page; if(nand_page_size == 4096) { page_shift = 12;//4k page block = offs / CONFIG_SYS_NAND_BLOCK_SIZE; lastblock = (offs + read_size - 1) / CONFIG_SYS_NAND_BLOCK_SIZE; page = (offs % CONFIG_SYS_NAND_BLOCK_SIZE) / CONFIG_SYS_NAND_PAGE_SIZE; if(block==0)//we always use first block for uboot image { /* Read step 1 */ for (i = 2; i < 4; i++, buf+=(1<<(page_shift-1))) nandll_read_page(buf, i, nand_page_size); /* Read step 2 */ for (i = 4; i < (read_size>>page_shift); i++, buf+=(1< >page_shift); i++, buf+=(1< >page_shift); i++, buf+=(1< 240KB because of U-Boot size increase. by scsuh * So, read 0x3c000 bytes not 0x20000(128KB). */ //led test writel(0x0023,0x7f008824); nandll_read_blocks(CONFIG_SYS_PHY_UBOOT_BASE, CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_UBOOT_SIZE, CONFIG_SYS_NAND_PAGE_SIZE); #ifdef CONFIG_NAND_ENV_DST //led test writel(0x002a,0x7f008824); nandll_read_blocks(CONFIG_NAND_ENV_DST, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, CONFIG_SYS_NAND_PAGE_SIZE); #endif uboot = (void *)CONFIG_SYS_PHY_UBOOT_BASE; (*uboot)(); }
#md 57e80000可以查看到环境变量都已经复制到内存,从而解决了该问题。