[U-Boot] [PATCH 4/6] spl: mmc: support loading i.MX container format file

[Peng Fan]

Hi Marek,

> Subject: Re: [U-Boot] [PATCH 4/6] spl: mmc: support loading i.MX container
> format file
> 
> On 5/20/19 3:30 AM, Peng Fan wrote:
> > Hi Simon,
> >
> >> Subject: Re: [PATCH 4/6] spl: mmc: support loading i.MX container
> >> format file
> >>
> >> Hi Peng,
> >>
> >> On Tue, 7 May 2019 at 06:52, Peng Fan <peng.fan at nxp.com> wrote:
> >>>
> >>> i.MX8 only support AHAB secure boot with Container format image, we
> >>> could not use FIT to support secure boot, so introduce container
> >>
> >> Why not FIT?
> >
> > Actually before we implement secure boot, we use FIT image, however
> > i.MX8 only support i.MX container format image for secure boot, The
> > chip will verify the container image when secure boot. It could not
> > recognize FIT image. So we have to drop FIT image.
> >
> >>
> >>> support to let SPL could load container images.
> >>
> >> What is a container image? Can you please point to documentation?
> >
> > Sadly, there is no public reference manual. There is a doc that has a
> > bit of information.
> >
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcomm
> >
> unity.nxp.com%2Fdocs%2FDOC-343178&data=02%7C01%7Cpeng.fan%4
> 0nxp.co
> >
> m%7C8626e7a1d20c44b8715408d6dcc4d866%7C686ea1d3bc2b4c6fa92cd9
> 9c5c30163
> >
> 5%7C0%7C0%7C636939135344595378&sdata=vmIaO78XmuL1tQJufqf7
> HCGdWHTCJ
> > bEpmGBio15j46U%3D&reserved=0
> 
> Shouldn't it suffice for the SPL to be in this custom format , while the rest of
> the binaries can be in fitImage ?

The issue is the SoC only support i.MX container format for secure boot(AHAB boot),
if we not use secure boot, FIT image do work and could work well.

We investigated using FIT for i.MX8 secure boot, but it does not make sense
we did a FIT wrapper for container. Container itself is also an image format, it contains
image load/entry/size and etc information.

I add a kconfig entry in SPL code, it does not hurt others if the Kconfig entry not chosen.

I do not know how other SoC vendor did FIT hardware secure boot, please share
you have any information.

Thanks,
Peng.

> 
> --
> Best regards,
> Marek Vasut