On 7/9/19 11:46 AM, Sascha Hauer wrote:
> Hi Reyhaneh,
>
> On Fri, Jul 05, 2019 at 02:04:08PM +0000, Yazdani, Reyhaneh wrote:
>> Hello everyone,
>>
>> I have brought up Barebox on imx8mm-evk board. Barebox is programmed on SD-card.
>> In the Barebox console, when I probe eMMC, I will receive I/O error.
>>
>> Therefore, similar to the imx8mq device tree, I added clk node to assign
>> clock-parent and clock-rates of the assigned clock of the eMMC (usdhc3):
>>
>> &clk {
>> assigned-clocks = <&clk IMX8MM_CLK_USDHC3_ROOT>;
>> assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_400M>;
>> assigned-clock-rates = <200000000>;
>> };
>>
>> Now, eMMC probe works and eMMC is detected. But when I want to boot from eMMC,
>>
>> Loading ARM aarch64 Linux image '/mnt/mmc2/Image' takes about 13-14 seconds!!
>
> How big is this image?
>
> Is only the eMMC card so slow or the SD card aswell?
>
> Does clk_dump give you any clue which clock rate the usdhc controller
> actually has (and is it the same as the other controller with the SD
> card)?
>
> Just some questions, I am not very familiar with the i.MX8 clock tree.
>
> Sascha
>
>
Hi Sascha,
It was related to the no initialization of PLL-clock. SYS_PLL1 is used as clock
parents for eMMC and it was not initialized in clock driver.
Best regards,
Reyhaneh
--
Reyhaneh Yazdani
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