ARM: MTD: mxc_nand: Question on NAND Flash support for mxc

[Alberto Panizzo]

Hi all!

I am trying to give support for NAND flash device to Atmark Armadillo 500
developing board.
This board has an iMX31 processor and is shipped with an ST Micro NAND 256MiB 3,3V 8-bit Flash.
Atmark support this board with an old 2.6.26 kernel with some modification.
For this NAND Flash Atmark installed the old Freescale mxc_nd driver brought up by
Sascha Hauer in the on tree mxc_nand.

Now the problem:
With the old driver kernel message is as follow:
--
MXC MTD nand Driver 2.0
NAND device: Manufacturer ID: 0x20, Chip ID: 0xda (ST Micro NAND 256MiB 3,3V 8-bit)
Scanning device for bad blocks
Bad eraseblock 592 at 0x04a00000
Creating 4 MTD partitions on "NAND 256MiB 3,3V 8-bit":
--

With the new in tree driver i get:
--
NAND device: Manufacturer ID: 0x20, Chip ID: 0xda (ST Micro NAND 256MiB 3,3V 8-bit)
Scanning device for bad blocks
Bad eraseblock 0 at 0x000000000000
Bad eraseblock 1 at 0x000000020000
Bad eraseblock 2 at 0x000000040000
Bad eraseblock 3 at 0x000000060000
Bad eraseblock 4 at 0x000000080000
Bad eraseblock 5 at 0x0000000a0000
Bad eraseblock 6 at 0x0000000c0000
Bad eraseblock 7 at 0x0000000e0000
.... all blocks ...
Bad eraseblock 2045 at 0x00000ffa0000
Bad eraseblock 2046 at 0x00000ffc0000
Bad eraseblock 2047 at 0x00000ffe0000
RedBoot partition parsing not available
Registering mxc_nand as whole device
--

All blocks are recognized as Bad eraseblocks! 

Digging the problem I switch off bbt scanning  and Bad eraseblock check in flash_eraseall (mtd utils 1.2.0)
running this utility results  in a mixture of:
--
Erasing 128 Kibyte @ 2e60000 -- 18 % complete.
flash_eraseall: /dev/mtd4: MTD Erase failure: Input/output error

Erasing 128 Kibyte @ 2ea0000 -- 18 % nand_erase: attempt to erase a bad block at page 0x00005e40
--

Thanks for any suggestions.

Alberto!