OMAP-L138 eMMC or Sdcard/MMC ?

Arya Ba

Other Parts Discussed in Thread: OMAP-L138

Hi All,

We are currently using a standard MMC/SDcard in our design. However, due to some reliability issues we are thinking of moving to the eMMC storage. I have some questions in that regard:

1. Are there any benefits in terms of reliability ? ( eg. smarter controller in eMMC ? )

2. Since OMAP-L138 does not support eMMC, do we get the benefits of the eMMC (if any) even though we will be interfacing it with the MMC protocol ?

3. Lastly, will be able to boot from the eMMC just as we would from the SDcards (boot pins set to boot from mmc) ?

Thanks,

Arya B.

over 11 years ago

0 Shankari G over 11 years ago

TI__Mastermind 43955 points

Hi Arya,

Arya says said:

2. Since OMAP-L138 does not support eMMC, do we get the benefits of the eMMC (if any) even though we will be interfacing it with the MMC protocol ?

3. Lastly, will be able to boot from the eMMC just as we would from the SDcards (boot pins set to boot from mmc) ?

( The following statements were extracted from the bootloader application note of OMAPL132/138 under section 6.5, http://www.ti.com/lit/an/sprab41d/sprab41d.pdf )

Regards,

Shankari.

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0 Arya Ba over 11 years ago in reply to Shankari G

Intellectual 690 points

Hi Shankari,

Just to clarify, during boot time the ROM bootloader in the OMAP-L138 only supports version 4.2 of the eMMC boot commands ? Furthermore, during normal operation mode are we still constrained to the version 4.2 of eMMC sepc ? Lastly, are there any advantages moving from a SDcard to a eMMC on the OMAP-L138 ?

Thanks,

Arya B.

0 Arya Ba over 11 years ago in reply to Arya Ba

Intellectual 690 points

Can someone please address the rest of our concerns? We need to make a decision in the short term.

Thank you very much,

Arya B.

0 Shankari G over 11 years ago in reply to Arya Ba

TI__Mastermind 43955 points

HI Arya,

Arya Says said:
Just to clarify, during boot time the ROM bootloader in the OMAP-L138 only supports version 4.2 of the eMMC boot commands ? Furthermore, during normal operation mode are we still constrained to the version 4.2 of eMMC sepc ? Lastly, are there any advantages moving from a SDcard to a eMMC on the OMAP-L138 ?

Please refer to this thread (http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/255685.aspx ) for more information on supporting eMMC; particularly the post done by Mukul Bhatnagar.

One another post on this : http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/290019.aspx

Regards,

Shankari

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0 Andres Vahter over 11 years ago

Intellectual 860 points

I was also dealing with eMMC, but on C6748. I think it shares the same PSP driver with L138.

Currently PSP drivers do not support eMMC, however I managed to get them work:

http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/p/276653/998961.aspx#998961

Unfortunately I could not make it work with 8 or 4 bit bus, however for some applications 1 bit could be enough.

Andres

Processors

Processors forum

OMAP-L138 eMMC or Sdcard/MMC ?