RTOS/AM4377: QSPI flash write fails

Yong-kyoung Kim

Intellectual 470 points

Part Number: AM4377

Tool/software: TI-RTOS

Hi, I've tried to use NOR flash(exactly same to NOR flash in AM437x_IDK) in XIP build.

In https://e2e.ti.com/support/arm/sitara_arm/f/791/t/590989,

I can use it by address.

So I tried "memcpy" function, but it doesn't seem to be worte in flash..

I used "Memory Browser" in CCS to check flash data, but the data inside is not same as I wanted.

How could I use NOR flash properly?

Thank you,

YK.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

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

0 lding over 8 years ago in reply to Biser Gatchev-XID

TI__Guru* 95265 points

Hi,

There is NOR flash writer for AM437X under
pdk_am437x_1_0_x\packages\ti\starterware\examples\qspi\flash_writer, this uses QSPI lib function calls. If you write an application to do the same function without using the writer, it was discuseed in e2e.ti.com/.../590989.

The QSPI memory is mapped like starting from 0x3000_0000 with 64MB. Are you able to use memcpy() to read data from QSPI memory into your application? From the E2E forum e2e.ti.com/.../1982989 read should work.

Regards, Eric

0 Yong-kyoung Kim over 8 years ago in reply to lding

Intellectual 470 points

Hi,
Thank you for your answer.
You mean that flash writing should be attempted in 4-byte address mode?
If that so, how can I change flash access mode to 4-byte address mode without the library?(library can't be used because of XIP mode..)
Thank you.

0 lding over 8 years ago in reply to Yong-kyoung Kim

TI__Guru* 95265 points

Hi,

For QSPI in 4-byte addressing mode, please check e2e.ti.com/.../2072887

Regards, Eric

0 Yong-kyoung Kim over 8 years ago in reply to lding

Intellectual 470 points

Hi, Eric.
I read the article you suggeted, but I'm not sure how I can use it.
Plus, you said 4-byte address mode, how couldn't I read 0x30020000?

I wanted use Flash in this way.

memcpy(FLASH_AREA_ADDRESS, DataAddress, DataSize);

The address I attepted to write is 0x30020000 at first.
So I use memcpy in this way.

memcpy(0x30020000, DataAddress, DataSize);

With CCS memory viewer, it seems succeeded writing, but after re-powering, the contents in flash memory changes.
Can 4-byte address mode setting help this problem? I'm not clearly sure..

And I'm using eXcute In Place(XIP) mode. Example libraries related to QSPI are not avilable on XIP.
So I can't use the functions in qspi_lib.c.

Thank you.

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RTOS/AM4377: QSPI flash write fails