[U-Boot] mmc erase Command and Bad Sectors
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
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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@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
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@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@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
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participants (2)
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Aron L. Phillips -
Jaehoon Chung