[U-Boot] mmc: fsl_esdhc: eMMC boot: CMD_ERR (-ECOMM) in u-boot while accessing SD

[Jagan Teki]

On Sun, Jan 15, 2017 at 5:40 PM, Jagan Teki <jagan at openedev.com> wrote:
> Hi,
>
> I've observed the CMD_ERR in U-Boot while accessing SD with boot from
> eMMC on i.MX6 board.
>
> SPL initializing SD as well eMMC controllers
> a) On SD bootmode: from u-boot prompt mmc dev 0 and mmc dev 1 is
> getting probe SD and eMMC
> b) On eMMC bootmode: from u-boot prompt mmc dev 0 is returning with
> -ECOMM in esdhc_send_cmd funtion of fsl_esdhc.c (see the below Log)
> but mmc dev 1 probed eMMC correctly
>
> Log:
> -----
> icorem6qdl-rqs> mmc dev 0
>
> esdhc_send_cmd: MMC=0x0 addr = 0x2198000, CMD0
>
> esdhc_send_cmd: MMC=0x0 addr = 0x2198000, CMD8
>
> ECOMM irqstat=0xc0001 CMD8
>
> esdhc_send_cmd: MMC=0x0 addr = 0x2198000, CMD55
>
> ECOMM CMD55
> mmc_init: -70, time 53
>
> With the above log, seems like irqstat has error with
> BIT19 -CIE-Command Index Error
> BIT18-CEBE-Command End Bit Error
>
> Usually once the CMD8 is executed based on the response the controller
> will switch to SD or MMC so further communication commands being
> changes based on that, but here due to controller irqstat error the
> controller is unable to switch to SD here.
>
> The actual working log is [1], this is booting from SD and here is
> full log[2] for booting from eMMC.
>
> [1] https://paste.ubuntu.com/23800820/
> [2] https://paste.ubuntu.com/23800833/
>
> Request for any help.

Did anyone find this issue? any clue?