From: "Yazdani, Reyhaneh" <RYazdani@data-modul.com>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: "barebox@lists.infradead.org" <barebox@lists.infradead.org>
Subject: Re: eMMC probe in imx8mm
Date: Fri, 12 Jul 2019 06:12:21 +0000 [thread overview]
Message-ID: <f8c1ac71-3920-344a-0961-55e3818f3a50@data-modul.com> (raw)
In-Reply-To: <20190709094640.n2hrjjed5ghywsea@pengutronix.de>
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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prev parent reply other threads:[~2019-07-12 6:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-05 14:04 Yazdani, Reyhaneh
2019-07-09 9:46 ` Sascha Hauer
2019-07-11 13:30 ` Yazdani, Reyhaneh
2019-07-12 6:12 ` Yazdani, Reyhaneh [this message]
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