AM3358: BCH4 support in Linux

Devaprasad GR

Part Number: AM3358

I am working on a project which requires BCH4 ECC scheme for NAND.. I searched all the uboot revisions but none have implementation for BCH4 ECC.

Any help(quick response) on this is really appreciated .

GPMC details :

AM335x GPMC controller

NAND details :

MT29F2G08AABWP (MICRON nand)

over 7 years ago

0 Biser Gatchev-XID over 7 years ago

TI__Guru**** 393215 points

The software team have been notified. They will respond here.

0 Steve Kipisz over 7 years ago in reply to Biser Gatchev-XID

TI__Genius 15510 points

I looked in our latest Processor SDK and it looks like BCH4 is supported. Look in drivers/mtd/nand/omap_gpmc.c

Steve K.

0 Devaprasad GR over 7 years ago

Intellectual 310 points

Part Number: AM3358

What is the value of eccSize0 and eccSize1 in GPMC(AM335x GPMC) ECC BCH4 read and write mode(BCH4 HW detection and HW correction) , ECC calculation is done for page size of 512Bytes and 2048Bytes NAND (NO Spare byte protection required) respectively.

My project demands BCH4 Hardware implementaion .

Value required are

BCH4 (512 page size)

Read mode : eccsize0 =?

eccsize1 =?

Write mode : eccsize0 =?

eccsize1 =?

and

BCH4 (2048 page size)

Read mode : eccsize0 =?

eccsize1 =?

Write mode : eccsize0 =?

eccsize1 =?

0 Devaprasad GR over 7 years ago in reply to Steve Kipisz

Intellectual 310 points

Software BCH4 support id there but what i need is hardware BCH4 support

0 Devaprasad GR over 7 years ago

Intellectual 310 points

Part Number: AM3358

I am worjing on a project which needs Hardware BCh4 support. Can anybody provide a patch for Hardware BCh4 support.

GPMC controller :

Am3358 GPMC

NAND details:

8bit Micron NAND

page size:2KB

0 Devaprasad GR over 7 years ago

Intellectual 310 points

Part Number: AM3358

I am working on a project which requires Hardware BCH4 implementation. TRM of AM335X only has ECC Data Mapping for 8 and 16b BCH Encoding.

Can someone help me in ECC Data Mapping for 4b BCH Encoding.

NAND Details:

8 bit NAND

page size: 2KB

0 Steve Kipisz over 7 years ago in reply to Devaprasad GR

TI__Genius 15510 points

Looking at the u-boot doc directory in README.nand, BCH4 is not supported, at least not in u-boot.

OMAP_ECC_BCH4_CODE_HW_DETECTION_SW
4-bit BCH code (unsupported)
OMAP_ECC_BCH4_CODE_HW
4-bit BCH code (unsupported)

Steve K.

0 Devaprasad GR over 7 years ago in reply to Steve Kipisz

Intellectual 310 points

HI Steve,

I mentioned in my earlier posts that BCH4 is not supported in u-boot but GPMC Hardware of Am335x supports BCH4.

Since we have limitation in NAND OOB Space,we are going for BCH4 implementation. If any patched are avialbale please do post me

0 Steve Kipisz over 7 years ago in reply to Devaprasad GR

TI__Genius 15510 points

I looked around and could not find any patches.

Steve K.

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AM3358: BCH4 support in Linux