[U-Boot] [PATCH v2 5/5] board: toradex: add colibri imx8qxp 2gb wb it v1.0b module support

[Peng Fan]

Hi Stefano,

> Subject: Re: [PATCH v2 5/5] board: toradex: add colibri imx8qxp 2gb wb it
> v1.0b module support
> 
> Hi Marcel,
> 
> On 25/04/19 14:35, Marcel Ziswiler wrote:
> > Hi Stefano
> >
> > On Thu, 2019-04-25 at 12:48 +0200, Stefano Babic wrote:
> >> Hi Marcel,
> >>
> >> On 09/04/19 17:25, Marcel Ziswiler wrote:
> >>> From: Marcel Ziswiler <marcel.ziswiler at toradex.com>
> >>>
> >>> This commit adds initial support for the Toradex Colibri iMX8QXP 2GB
> >>> WB IT V1.0B module. Unlike the V1.0A early access samples
> >>> exclusively booting from SD card, they are now strapped to boot from
> >>> eFuses which are factory fused to properly boot from their on-module
> >>> eMMC. U- Boot supports either booting from the on-module eMMC or
> may
> >>> be used for recovery purpose using the universal update utility
> >>> (uuu) aka mfgtools 3.0.
> >>>
> >>> Functionality wise the following is known to be working:
> >>> - eMMC and MMC/SD card
> >>> - Ethernet
> >>> - GPIOs
> >>> - I2C
> >>>
> >>> Unfortunately, there is no USB functionality for the i.MX 8QXP as of
> >>> yet.
> >>>
> >>> Signed-off-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>
> >>>
> >>> ---
> >>>
> >>
> >> I merged the series and build locally (fine), but Travis complains
> >> and stops with error:
> >>
> >> +cc1: fatal error: opening output file spl/u-boot-spl.cfgout: No such
> >> file or directory
> >> +compilation terminated.
> >>
> >> Can you take a look at it ?
> >
> > Sure, looks like Peng's commit caceb739ea07 ("imx: build flash.bin for
> > i.MX8") takes SPL for granted while my patchset currently avoids it.
> 
> It looks so, yes.
> 
> >
> > BTW: I still don't believe SPL makes much sense on i.MX 8X given all
> > the other proprietary parts involved in booting.
> 
> SPL makes more sense if it is possible to detect at runtime the HW and
> change the configuration - for i.MX6, this means RAMS detection, which boot
> device is booting, and so on.
> 
> On i.MX8 there is a lot of proprietary parts - we lose the flexibility of SPL, and
> most features are lost (or must be provided by proprietary code). I agree that
> on this platform SPL makes less sense, and i.MX8 should be built
> independently if CONFIG_SPL is set (this is also for
> i.MX6 / MX5, there are boards without SPL and using the DCD image to set up
> the RAM controller).


The reason we move to use SPL on i.MX8 is that we would like to avoid
bind ATF/OP-TEE/U-Boot into a flat image with hacked offset in an image.

So the bootflow now is
SPL->ATF->OPTEE->ATF->U-Boot

Without SPL, when generating flash.bin, we have to hack ATF to copy OP-TEE
image from flash.bin to the runtime location.

> 
> > Plus currently SPL
> > actually breaks the USB serial downloader aka recovery mode using the
> > universal update utility (uuu) aka mfgtools 3.0.

The usb related function for i.MX8 is not ready now. we are almost run out
of ocram with SPL DM, thinking to use OF_PLATDATA now, then move
to usb functions.

Thanks,
Peng.

> >
> 
> Regards,
> Stefano
> 
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