[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
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