[U-Boot] mmc erase Command and Bad Sectors

[U-Boot] mmc erase Command and Bad Sectors

[Aron L. Phillips]

To whom it may concern:

I am not sure how this email list works but I am interested in knowing what exactly does the mmc erase command do? I know it erases the mmc, but in what manner? Does it clear bad sector marks or for that matter, place them? Any explanation would be greatly appreciated. The type of mmc I am using is a Kingston eMMC data flash that is similar to an SD card on an IC.
Sincerely,



Aron L. Phillips
Software/Hardware Developer
GHI Electronics, LLC
Where Hardware Meets Software
501 E. Whitcomb Ave
Madison Heights, MI 48071, USA
TEL: +1 (248) 397-8856
FAX: +1 (248) 397-8890
WEB: www.ghielectronics.com

Disclaimer: The information transmitted and any attachments are intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, re-transmission, dissemination or other use of, or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you are not the intended recipient and received this in error, please contact the sender and delete the material from your system. 

[U-Boot] mmc erase Command and Bad Sectors

[Jaehoon Chung]

On 07/26/2016 10:41 PM, Aron L. Phillips wrote:
> To whom it may concern:
> 
> I am not sure how this email list works but I am interested in knowing what exactly does the mmc erase command do? I know it erases the mmc, but in what manner? Does it clear bad sector marks or for that matter, place them? Any explanation would be greatly appreciated. The type of mmc I am using is a Kingston eMMC data flash that is similar to an SD card on an IC.
> Sincerely,

Do you want to know ERASE command(CMD38) that supported on only u-boot side?

Best Regards,
Jaehoon Chung

> 
> 
> 
> Aron L. Phillips
> Software/Hardware Developer
> GHI Electronics, LLC
> Where Hardware Meets Software
> 501 E. Whitcomb Ave
> Madison Heights, MI 48071, USA
> TEL: +1 (248) 397-8856
> FAX: +1 (248) 397-8890
> WEB: www.ghielectronics.com
> 
> Disclaimer: The information transmitted and any attachments are intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, re-transmission, dissemination or other use of, or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you are not the intended recipient and received this in error, please contact the sender and delete the material from your system. 
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
> 
> 
> 

[U-Boot] mmc erase Command and Bad Sectors

[Aron L. Phillips]

Greetings Jaehoon,

No. When I enter into u-boot (when I press the space bar booting the 
Beaglebone Black) I will see this =>

From this command prompt, I type mmc dev 1 and it switches to the onboard 
eMMC chip. If I type mmc erase 0 0x500000, it erases 5,242,880 block 
sectors. I would like to know what it is actually doing to the chip in terms 
of is it changing any of the marked sectors that are marked as bad (if there 
are any). Is it doing anything to the chip that I do not want it to do? How 
is it erasing the chip, etc?

Sincerely

Aron

-----Original Message----- 
From: Jaehoon Chung
Sent: Wednesday, July 27, 2016 7:34 AM
To: Aron L. Phillips ; u-boot at lists.denx.de
Subject: Re: [U-Boot] mmc erase Command and Bad Sectors

On 07/26/2016 10:41 PM, Aron L. Phillips wrote:
> To whom it may concern:
>
> I am not sure how this email list works but I am interested in knowing 
> what exactly does the mmc erase command do? I know it erases the mmc, but 
> in what manner? Does it clear bad sector marks or for that matter, place 
> them? Any explanation would be greatly appreciated. The type of mmc I am 
> using is a Kingston eMMC data flash that is similar to an SD card on an 
> IC.
> Sincerely,

Do you want to know ERASE command(CMD38) that supported on only u-boot side?

Best Regards,
Jaehoon Chung

>
>
>
> Aron L. Phillips
> Software/Hardware Developer
> GHI Electronics, LLC
> Where Hardware Meets Software
> 501 E. Whitcomb Ave
> Madison Heights, MI 48071, USA
> TEL: +1 (248) 397-8856
> FAX: +1 (248) 397-8890
> WEB: www.ghielectronics.com
>
> Disclaimer: The information transmitted and any attachments are intended 
> only for the person or entity to which it is addressed and may contain 
> confidential and/or privileged material. Any review, re-transmission, 
> dissemination or other use of, or taking of any action in reliance upon 
> this information by persons or entities other than the intended recipient 
> is prohibited. If you are not the intended recipient and received this in 
> error, please contact the sender and delete the material from your system.
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
>
>
>



-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2015.0.6201 / Virus Database: 4627/12686 - Release Date: 07/26/16