nand erase problem in u-boot

GIHWAN AHN

HI all

My board is am335x-evm, SDK is sdk-02.00.00.11.

I have one problem.

I tried to delete a specific area (0x20000 to 0x7ffff) using the nand command in u boot, but I get an error. However, using nanderas.chip will erase it nicely. Writing to a specific area works well. But, as I said

above, if I say "do not erase 0x20000 0x20000".

I get an error with the message "Trying to erase unblocked data".

There is no problem after 0x80000.

Answer please

over 5 years ago

0 Hong Guan64 over 5 years ago

TI__Guru* 77580 points

Hi Gihwan,
The error message is due to the nand erase offset is not aligned with nand sector block as shown in code snippet below.

/drivers/mtd/nand/raw/nand_util.c
int nand_erase_opts(struct mtd_info *mtd,
		    const nand_erase_options_t *opts)
{
...
	if ((opts->offset & (mtd->erasesize - 1)) != 0) {
		printf("Attempt to erase non block-aligned data\n");
		return -1;
	}
...
}

I uploaded the nand erase log captured on AM335x GP EVM with SDK 6.3, where nand sector size is 128KiB (0x20000).
So nand erase offset needs to be 0x20000 aligned.

Best,

-Hong

Fullscreen am3_nand_erase_test.txt Download

=> nand info

Device 0: nand0, sector size 128 KiB
  Page size       2048 b
  OOB size          64 b
  Erase size    131072 b
  subpagesize      512 b
  options     0x4000400c
  bbt options 0x00008000
=> mtdparts

device nand0 <nand.0>, # parts = 10
 #: name		size		offset		mask_flags
 0: NAND.SPL            0x00020000	0x00000000	0
 1: NAND.SPL.backup1    0x00020000	0x00020000	0
 2: NAND.SPL.backup2    0x00020000	0x00040000	0
 3: NAND.SPL.backup3    0x00020000	0x00060000	0
 4: NAND.u-boot-spl-os  0x00040000	0x00080000	0
 5: NAND.u-boot         0x00100000	0x000c0000	0
 6: NAND.u-boot-env     0x00020000	0x001c0000	0
 7: NAND.u-boot-env.backup10x00020000	0x001e0000	0
 8: NAND.kernel         0x00800000	0x00200000	0
 9: NAND.file-system    0x0f600000	0x00a00000	0

active partition: nand0,0 - (NAND.SPL) 0x00020000 @ 0x00000000

defaults:
mtdids  : nand0=nand.0
mtdparts: mtdparts=nand.0:128k(NAND.SPL),128k(NAND.SPL.backup1),128k(NAND.SPL.backup2),128k(NAND.SPL.backup3),256k(NAND.u-boot-spl-os),1m(NAND.u-boot),128k(NAND.u-boot-env),128k(NAND.u-boot-env.backup1),8m(NAND.kernel),-(NAND.file-system)
=> nand erase 0x0 0x20000

NAND erase: device 0 offset 0x0, size 0x20000
Erasing at 0x0 -- 100% complete.
OK
=> nand erase 0x10000 0x20000

NAND erase: device 0 offset 0x10000, size 0x20000
Attempt to erase non block-aligned data
ERROR
=>

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nand erase problem in u-boot