On 02/01/2017 05:48 PM, amit mahadik wrote: > Hi Jaehoon, > Thanks for replying promptly. adding more debug > prints I see that CMD9(CSD) CMD51(SSR) values in case of SD and SPI > mode are the same. Only command that troubles is CMD18. My clock > setting is 25Mhz and the card is working at 3.3V. I don't have a knowledge about SPI mode..it might have the difference initial sequence. How about checking "use_spi_crc"?..Someone might have much knowledge for SPI mode. :) Best Regards, Jaehoon Chung > > Regards, > Amit. > > On Wed, Feb 1, 2017 at 1:38 PM, Jaehoon Chung <jh80.chung@xxxxxxxxxxx> wrote: >> 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. >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >>> >> > > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
