Error fsl_esdhc: Internal clock never stabilised.

[Sinan Akman]

   Hi Pali

On 2022-04-29 1:35 p.m., Pali Rohár wrote:
> Hello!
>
> U-Boot prints error "fsl_esdhc: Internal clock never stabilised." on
> P2020 everytime when trying to access SD card. It happens with every
> tested SD card. Note that both read and write operation with SD card is
> working fine, U-Boot just prints that noisy error.
>
> For example:
>
>    SD boot...
>    No max bus width provided. Assume 8-bit supported.
>    Second program loader running in sram...
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>
> Or:
>
>    => mmc info
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    fsl_esdhc: Internal clock never stabilised.
>    Device: FSL_SDHC
>    Manufacturer ID: 3
>    OEM: 5344
>    Name: SA16G
>    Bus Speed: 50000000
>    Mode: SD High Speed (50MHz)
>    Rd Block Len: 512
>    SD version 3.0
>    High Capacity: Yes
>    Capacity: 14.8 GiB
>    Bus Width: 1-bit
>    Erase Group Size: 512 Bytes
>
> I tried to bisect this error and I figured out that U-Boot prints this
> error since beginning when this error message was added into fsl_esdhc
> driver.
>
> Do you have any idea what is wrong? And how to fix it?

     AFAIR this is related to the issue that some of the the register
fields did not exist in p2020 and the patch was added for T series.
Please take a look at the reference manuals and verify that the
register that the code checks did not exist in P2020. In this case
I believe you can simple exclude this check with #ifdef P2020 or
something to this effect.

   Thanks
   Sinan Akman