Starterware/AM3352: NAND addressing question

Singamsetty Vamsi

Intellectual 880 points

Part Number: AM3352

Tool/software: Starterware

Hi,

Currently i am using the starterware-02_00_01_01 version.

in examples folder /examples/evmAM335X//nand/nandreadwrite.c file

- NANDBlockErase() function calling it's present in the nandlib.c file

nandlib.c file

- NANDBlockErase() function the below line, (for Eamples blknum=20 , firstpageBlk =20*64)

firstpageofBlk = (blknum * (nandInfo -> pagesPerBlk);

This statement gives the linear page Number(1280).

My Query is,

- Here, we get only page Number and write into NANDAddress register() , but NAND flash not understand this page number, NAND flash understand only address.

- Query:1 - Who will convert this address, Explain briefly?

Regards,

Vamsi.

over 8 years ago

0 Lalindra Jayatilleke over 8 years ago

TI__Mastermind 30365 points

I have asked someone to assist with this. Thanks for your patience.

0 Rahul Prabhu over 8 years ago

TI__Guru** 116780 points

Vamsi,

Please refer to this white paper on parallel NAND geometry and the way the data is organized on the NAND in form or blocks, and pages.
www.bpmmicro.com/.../BPM_NAND_White_Paper_1008_docmetrics.pdf

Unlike NOR flash devices, data on NAND is not direct addressable. You can only read or write a specific page on a specific block and the driver in Starterware is designed to operate in the same way.

We also have quite a few resources on the wiki to see how a managed and Raw NAND interfaces with ti devices ::
processors.wiki.ti.com/.../Determining_compatibility_between_ROM_Bootloader_(RBL)_and_Raw_NAND_devices

I hope this helps you better insight into how the NAND driver handles the reads/write/erase.

Regards,
Rahul

0 Singamsetty Vamsi over 8 years ago in reply to Rahul Prabhu

Intellectual 880 points

Hi Rahul,

I have a query ,

nand write 0x5000000 0x6C0000 0xBA0000

This is calling from with kernel for writing purpose.

Query: Who change this address (0x6C000) to Page Number ?.

Can you explain briefly.

Reagrds,

Vamsi

0 Rahul Prabhu over 8 years ago in reply to Singamsetty Vamsi

TI__Guru** 116780 points

Vamsi,

I can only comment on the Bare-metal/Starterware usecase and not from Linux kernel/u-boot perspective. I have looped in one of my colleagues to provide insight from the kernel perspective.

Regards,

Rahul

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Starterware/AM3352: NAND addressing question