Re: Imx-usb-loader broken on IMX8MP/v2022.09.0

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On Tue, Sep 27, 2022 at 7:45 PM Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
>
> Hello Hans,
>
> On 17.09.22 13:04, Hans Christian Lønstad wrote:
> > This is observed using straight out of the box v2022.09.0 on NXP IMX8MP Eval kit:
> >
> > ---------
> >
> > $ sudo ../drimx8/scripts/imx/imx-usb-loader ../drimx8/images/barebox-nxp-imx8mp-evk.img
> > [sudo] password for hcl:
> > found i.MX8MP USB device [1fc9:0146]
> > 4 in err=-9, last_trans=0  00 00 00 00
> > status failed
>
> I just tested and have the same issue on i.MX8M Nano, which uses
> the same new SDPS protocol. I've just sent out a potential fix.
>
> > ————
> >
> > Stripping off the header gap (32K) allows the binary to load using the standard NXP uuu (Ubuntu 22.04) utility,.
> >
> > This further raises the question: Why have a header gap at all?
> >
> > The makes sense for SD card loading, but not for eMMC boot partitions where ROM expects code to start at 0.
>
> The realization that the eMMC boot partition usually lacks an on-disk partition
> table came quite late to the NXP BootROM authors. On i.MX8M Mini, we still have
> an offset for both SD-Card and eMMC boot partition.
>
> > Maybe better just use a seek to put the code at the relevant position on the SD card?
>
> imx-usb-loader does the correct thing and skips to the relevant position.
> barebox_update should do the correct thing and skip over the header.
>
> > For instance, I am using the Rauc boot loader slot update mechanism expecting no gap thus  requiring me to shave of 32k
> > prior to shipping.
>
> This is unfortunate, but I don't think this is something we should address at the
> barebox side. barebox images for i.MX are always meant to be directly written
> to an SD-Card at offset 0.
>
> For RAUC integration, you may consider having your build system shave off the
> bytes transparently. See for example:
>
> https://github.com/rauc/meta-rauc/commit/8e049699f05483b694e6c5a3e260cd9e0fe58d2e
>
> which does the inverse operation: pad U-Boot for older i.MX, so they are install-able
> into an eMMC boot partition.
>
> Cheers,
> Ahmad
>
> >
> > Comments??
> >
> > Hans Christian
> >
>
>
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