TMS320C6748: eMMc does not work well after boot

Jonathan CHEN

Prodigy 80 points

Part Number: TMS320C6748

Hi !

In my work,C6478 boot whit eMMc.It works well with a simple led shinng program.

And then I try to boot with a emmc program.

After boot,emmc program stoped when reading the ext_csd information from emmc card. The status is timeout.

	status =  SDMMC_sendCmd(hSDMMCMemInfo->hSDMMCInfo, 0x2000 |SDMMC_CMD8|SDMMC_RSP1,0, 0xFFFF);
	if( status != E_PASS )
	{
		asm(" SWBP 0 ");
	}

I can not read or write emmc after boot .

The program works well in CCS Debug.But it failed when boot from emmc.

The emmc version is 5.0.I flash the program at the 3rd sector of emmc.

thanks!

over 8 years ago

0 Yordan Kovachev over 8 years ago

TI__Guru**** 161600 points

Can you share which SDK version are you using? Or is this a bare metal code?

Best Regards,
Yordan

0 Rahul Prabhu over 8 years ago

TI__Guru** 116980 points

When you are running code using CCS, the GEL file is essentially used to setup the clocks, DDR and PSC. Are you sure your boot configuration does the same clock configuration ? Also, the bootloader was return to be compatible with eMMC 4.0 so it may not be using the command that you are using. I have attached the file that describe the commands used in bootloader code.

sdmmc_mem_ROMusage.zip

We have tested the device with some eMMC 5.0 devices from Kingston and Sandisk and were able to get them to work with the device with existing drivers. Can you please indicate which eMMC device you are using.

Regards

Rahul

0 Jonathan CHEN over 8 years ago in reply to Yordan Kovachev

Prodigy 80 points

Hi Yordan

version is : C6748_StarterWare_1_20_04_01

0 Jonathan CHEN over 8 years ago in reply to Rahul Prabhu

Prodigy 80 points

Hi Rahul

I use the same code as you attached. But I changed some code,such as databus,highspeed mode .And I use DMA Instead of CPU.

The eMMC device is micron: MTFC16GAKAECN-2M WT.

The ais file is generated by AISgen for D800K008.the config file is attached.

thanks!

JonathanChenAisConfig.cfg

0 Jonathan CHEN over 8 years ago in reply to Rahul Prabhu

Prodigy 80 points

See my reply

0 Rahul Prabhu over 8 years ago in reply to Jonathan CHEN

TI__Guru** 116980 points

Jonathan,

there is nothing that is jumping at me in your configuration. HAve you tried to software reset the eMMC module and redo the initialization in your code to see if this helps with the hang. Is EMMC the only peripheral that is not working post boot ?

Regards,
Rahul

0 FrankXu over 8 years ago in reply to Rahul Prabhu

Genius 3500 points

Hi Rahul Prabhu,

I am a team member with Jonathan CHEN, who posted this post.

We used the same file as you attatched in sdmmc_mem_ROMusage.zip. But the problem is still unsolved. And we find that when reading a lot of blocks continously, the program will stuck at somewhere.

"We have tested the device with some eMMC 5.0 devices from Kingston and Sandisk and were able to get them to work with the device with existing drivers. " Can you provide us the test project you use?

Thanks a lot!

Frank

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TMS320C6748: eMMc does not work well after boot