[U-Boot] Cannot boot mx6qsabred with 2019.07-rc2

[Lukasz Majewski]

On Thu, 16 May 2019 16:40:56 -0300
Fabio Estevam <festevam at gmail.com> wrote:

> On Thu, May 16, 2019 at 2:32 PM Fabio Estevam <festevam at gmail.com>
> wrote:
> >
> > Hi,
> >
> > I get the following error when trying to boot mx6q sabresd with
> > 2019.07-rc2:
> >
> > U-Boot SPL 2019.07-rc2 (May 16 2019 - 14:28:55 -0300)
> > Trying to boot from MMC1
> > spl: could not find mmc device 0. error: -19
> > SPL: failed to boot from all boot devices
> > ### ERROR ### Please RESET the board ###
> >
> > I haven't debugged this yet.
> >
> > Does anyone have any ideas?  
> 
> SPL is able to load u-boot-dtb.img if I disable CONFIG_SPL_DM:
> 
> --- a/configs/mx6sabresd_defconfig
> +++ b/configs/mx6sabresd_defconfig
> @@ -65,7 +65,6 @@ CONFIG_SPL_MULTI_DTB_FIT=y
>  CONFIG_SPL_OF_LIST="imx6dl-sabresd imx6q-sabresd imx6qp-sabresd"
>  CONFIG_ENV_IS_IN_MMC=y
>  CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
> -CONFIG_SPL_DM=y
>  CONFIG_USB_FUNCTION_FASTBOOT=y
>  CONFIG_FASTBOOT_BUF_ADDR=0x12000000
>  CONFIG_FASTBOOT_BUF_SIZE=0x10000000
> 
> Do we really want to use DM within SPL?
> 
> If we do, does anyone know how to fix it?

Please find following repository with DM/DTS conversion for TPC70 imx6q
board (it also has SPL DM conversion working - board boots from SD
card and eMMC):

https://github.com/lmajewski/u-boot-dfu/commits/DM-SPL-TPC70

My guess is that you need the pinctrl DM support in SPL, to make the
card detect pin working.

&pinctrl_usdhc4 {
	u-boot,dm-spl;
};

&pinctrl_usdhc2 {
	u-boot,dm-spl;
};

&gpio2 {
	u-boot,dm-spl;
};

And also the pinctrl-imx6q.c fix to:

static struct imx_pinctrl_soc_info imx6_pinctrl_soc_info
__section(".data");


To sum up: TPC70 (imx6q) has support for DM/DTS in both SPL and u-boot
proper.

The issue with this port is that it uses Common Clock Framework from
Linux and would need SPL's OF_PLATDATA support in eMMC and uart drivers
to reduce SPL size.



Best regards,

Lukasz Majewski

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