nand_get_flash_type: second ID read did not match 0e,ec against 0b,0b

NAND: nand_get_flash_type: second ID read did not match 0e,ec against 0b,0b

No NAND device found!!!

0 MiB

我确定硬件没有问题，因为别的u-boot，不会出现这个问题！而且nandflash
能读写正常

//这种情况可能是NFCONF NFCONT没有配置好的原因.

//我的板子上对应：

twrph0 = 4;
//这个根据芯片手册设置，韦东山用的010

twrph1 = 2;

tacls = 0;

cfg = 0;

cfg |= S3C2410_NFCONF_TACLS(tacls - 1);

cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);

cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);

writel(cfg, &nand_reg->NFCONF);
//这个是配置寄存器，时序.

cfg = (0<<13)|(0<<12)|(0<<10)|(0<<9)|(0<<8)|(0<<6)|(0<<5)|(1<<4)|(0<<1)|(1<<0);

writel(cfg, &nand_reg->NFCONT);