From: Jaehoon Chung <jh80.chung@samsung.com>
To: amit mahadik <amitmaddy@gmail.com>, linux-mmc@vger.kernel.org
Subject: Re: How to print CMD18 read data
Date: Wed, 01 Feb 2017 17:08:37 +0900 [thread overview]
Message-ID: <e0fcedc7-58f4-7ee3-e182-db684c8748d6@samsung.com> (raw)
In-Reply-To: <CAMGZvfKXGwmrOSD-z_4F5aM5S7TPENmPkLKQ3ArQxJ+rEruhtg@mail.gmail.com>
Hi,
On 02/01/2017 04:23 PM, amit mahadik wrote:
> Hello,
> I want to interface MMC card via SPI bus. However, I am
> getting CRC errors for CMD18. I tried reading partition table using
> CMD17 but still get errors.
> The same SDMMC card gets detected using SD interface. I want to
> compare the data of CMD18/CMD17 of SD and SPI modes. Please let me
> know how can I print the read data of the said commands in the block
> layer?
In my experience, CRC error was timing issue..(clock, driver-strength, etc..)
You can check those things.
Best Regards,
Jaehoon Chung
>
> I tried using the following code but it didn't help
>
> sg_copy_to_buffer(brq->data.sg, brq->data.sg_len, buf, 4096); and printed buf.
>
> Regards,
> Amit.
> --
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>
next prev parent reply other threads:[~2017-02-01 8:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20170201072351epcas2p4b40fc91e204153ce57d510622ab021cc@epcas2p4.samsung.com>
2017-02-01 7:23 ` How to print CMD18 read data amit mahadik
2017-02-01 8:08 ` Jaehoon Chung [this message]
2017-02-01 8:48 ` amit mahadik
2017-02-01 11:43 ` Jaehoon Chung
2017-02-01 12:16 ` amit mahadik
2017-02-01 18:00 ` David Haworth
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