> OK，guys,I can discribe this question in the other way.
> When I download the program image to the nand flash in the uboot.
> At firist, I need to erase the nand flash by running the command of "nand
> erase" or "nand scrub" in the cmdline. But sometimes this step will be
> failed because one block of this flash is bad, and this command will
> return "Failed erase".
Scrub wont, but it's stupid to use. Nand erase should mark the block bad into
BBT. Anyway, what version of uboot do you use?
>
> Guys what would you do when you got this problem? Do I need to mrak this
> block as bad block and add it to the bad block table with software? how
> to do this ? Thank you !
>
> At 2011-11-25 16:51:17,"Marek Vasut" <marek.va...@gmail.com> wrote:
> >> Hi, guys I got a problem. I move a part of source code of
> >> linux/driver/mtd/nand to the u-boot. But I found that the u-boot can not
> >> mark the phsical bad block . when I run nand_erase() or nand_scrub(), it
> >> return error num as below: linux/driver/mtd/nand/nand_base.c
> >>
> >> 2589 chip->erase_cmd(mtd, page & chip->pagemask);
> >> 2590
> >>
> >> status = chip->waitfunc(mtd, chip); 2592
> >> /*
> >>
> >> 2593 * See if operation failed and additional status
> >>
> >> checks are 2594 * available
> >>
> >> 2595 */
> >> 2596 if ((status & NAND_STATUS_FAIL) &&
> >>
> >> (chip->errstat)) 2597 status =
> >> chip->errstat(mtd, chip, FL_ERASING, 2598
> >> status, page); 2600 /* See if block erase succeeded */
> >>
> >> 2601 if (status & NAND_STATUS_FAIL) {
> >> 2602 DEBUG(MTD_DEBUG_LEVEL0, "%s: Failed
> >> erase,
> >>
> >> " 2603 "page 0x%08x\n",
> >> __func__, page); 2604 instr->state =
> >> MTD_ERASE_FAILED;
> >>
> >> 2605 instr->fail_addr =
> >> 2606 ((loff_t)page <<
> >>
> >> chip->page_shift); 2607 goto erase_exit;
> >>
> >> 2608 }
> >>
> >> you can find that if block erase is failed(status==-1), it only
> >>
> >> mark the instr(we will not use the instr later), and go to the
> >> erase_exit. So there is no code to mark the oob of the phisical bad
> >> block, neither add it to the bad block table. so ,I add the code of
> >> writing oob of the phisical bad block when it is erased failed, such as
> >> below:
> >> chip->erase_cmd(mtd, page & chip->pagemask);2589
> >>
> >> - Ignored:
> >> 2590 status = chip->waitfunc(mtd, chip);
> >> 2592 /*
> >> 2593 * See if operation failed and additional status
> >>
> >> checks are 2594 * available
> >>
> >> 2595 */
> >> 2596 if ((status & NAND_STATUS_FAIL) &&
> >>
> >> (chip->errstat)) 2597 status =
> >> chip->errstat(mtd, chip, FL_ERASING, 2598
> >> status, page); 2600 /* See if block erase succeeded */
> >>
> >> 2601 if (status & NAND_STATUS_FAIL) {
> >> 2602 DEBUG(MTD_DEBUG_LEVEL0, "%s: Failed
> >> erase,
> >>
> >> " 2603 "page 0x%08x\n",
> >> __func__, page); 2604 instr->state =
> >> MTD_ERASE_FAILED;
> >>
> >> 2605 instr->fail_addr =
> >> 2606 ((loff_t)page <<
> >>
> >> chip->page_shift); nand_write_oob(addr);
> >>
> >> 2607 goto erase_exit;
> >> 2608 }
> >>
> >> Guys, what do you think of it , and what would you to if you got
> >>
> >> this problem.
> >
> >Can you please fix your mailer and send this stuff again? It's really hard
> >to decode what you're asking please.
> >
> >M
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