Format MMC

[Embedded Systems <iv...@gmail.com>]

Hello,

I have a custom board with imxrt1050 and eMMC memory on it. The
communication between the imxrt1050 and the eMMC is working perfectly but
my problem is that the eMMC comes not formatted. So i would like to ask is
it possible to Format a eMMC/SDcard in FAT32 file system from nuttx command
line?

Thank you in advance!

Best regards,
Ivan Ucherdzhiev

Re: Format MMC

[Gregory Nutt <sp...@gmail.com>]

> I am using 4 GB eMMC at the moment , and so far it is working perfectly.
> Nuttx is recognizing the eMMC it is able to format it in FAT and now i am
> able to mount it , read and write in it, so so far i have no problems at
> all with the eMMC. THe only thing is that i use 1 wire setup so , I am not
> using the full speed which eMMC can offer but for my case that is okay.
> Later on i am planning to add also the Fast modes and 4 wire and 8 wire
> support.

I believe you will need some modifications to the MMC/SD  driver when 
you need the fast mode and wide bus support.

But I am glad to hear that it is meeting your needs as it is for now.

Greg

Re: Format MMC

[Embedded Systems <iv...@gmail.com>]

Hello Mr. Gregory,

I am using 4 GB eMMC at the moment , and so far it is working perfectly.
Nuttx is recognizing the eMMC it is able to format it in FAT and now i am
able to mount it , read and write in it, so so far i have no problems at
all with the eMMC. THe only thing is that i use 1 wire setup so , I am not
using the full speed which eMMC can offer but for my case that is okay.
Later on i am planning to add also the Fast modes and 4 wire and 8 wire
support.

Best regards,
Ivan Ucherdzhiev

On Tue, Jan 21, 2020 at 6:36 PM Gregory Nutt <sp...@gmail.com> wrote:

>
> > Please excuse me i found the mkfatfs command  and everything is working
> > perfectly. Please excuse me for disturbing you.
>
> I don't really know very much about eMMC, but the MMC support in NuttX
> was designed and implemented only for Classic MMC cards.  I have heard
> reports from you and other people that it works with eMMC.  But that
> just shows that they supported backward compatibility with old MMC cards.
>
> My understanding is the eMMC has extensions -- including 4-bit width
> transfers -- that are not implemented.  I suspect that if you really
> want proper eMMC performance, those extensions would need to be
> implemented.
>
> Greg
>
>
>

-- 
Kind regards,
Ivan Ucherdzhiev

Team Lead @ Barin Sports
Bulgaria
skype: ipy_44
tel: +359888927760

Re: Format MMC

[Gregory Nutt <sp...@gmail.com>]

> Please excuse me i found the mkfatfs command  and everything is working
> perfectly. Please excuse me for disturbing you.

I don't really know very much about eMMC, but the MMC support in NuttX 
was designed and implemented only for Classic MMC cards.  I have heard 
reports from you and other people that it works with eMMC.  But that 
just shows that they supported backward compatibility with old MMC cards.

My understanding is the eMMC has extensions -- including 4-bit width 
transfers -- that are not implemented.  I suspect that if you really 
want proper eMMC performance, those extensions would need to be implemented.

Greg

Re: Format MMC

[Embedded Systems <iv...@gmail.com>]

Hello

Please excuse me i found the mkfatfs command  and everything is working
perfectly. Please excuse me for disturbing you.

Have a good day!

On Tue, Jan 21, 2020 at 5:52 PM Embedded Systems <iv...@gmail.com>
wrote:

> Hello,
>
> I have a custom board with imxrt1050 and eMMC memory on it. The
> communication between the imxrt1050 and the eMMC is working perfectly but
> my problem is that the eMMC comes not formatted. So i would like to ask is
> it possible to Format a eMMC/SDcard in FAT32 file system from nuttx command
> line?
>
> Thank you in advance!
>
> Best regards,
> Ivan Ucherdzhiev
>


-- 
Kind regards,
Ivan Ucherdzhiev

Team Lead @ Barin Sports
Bulgaria
skype: ipy_44
tel: +359888927760