[PATCH v2 5/7] platform: Add Renesas RZ/Five initial support

[Yu-Chien Peter Lin <peterlin@andestech.com>]

Hi Prabhakar,

> > The fact that you have to compile ae350/cache.c as part of this platform
> > shows we need to improve code re-use.
> >
> > Further, the platform.c added by this patch is very similar to platform.c
> > of andes/ae350. Both platform.c files are subset of what is already there
> > in generic/platform.c.
> >
> > I suggest you do the following:
> > 1) Move andes/ae350 as a platform override under generic/platform/andes/ae350
> > 2) Add rzfive as platform override under generic/platform/renesas/rzfive
> > 3) The common Andes cache operations will be a library under
> >     generic/platform/andes/ae350 which can be selected by renesas/rzfive
> > 4) The common Andes header can be under generic/include/andes/ae350
> > 5) Enable drivers required by andes/ae350 and renesas/rzfive platform
> >     overrides in generic/configs/defconfig
> >
> - The reason for not using generic is because the FW_TEXT_START is different.
> -  I came across the thread where because the generic FW uses FW_PIC
> it doesn matter about the FW_TEXT_START, is this correct?

We will use generic platform as Anup suggested. I'll send our patch soon.
When FW_PIC=y (default), set CONFIG_SPL_OPENSBI_LOAD_ADDR to 0x44000000
in U-boot should be able to run OpenSBI.

> -  Moving forward I built rz/five as part of generic override successfully
> - But when I try and build the u-boot with fw_dynamic.bin I get the
> below errors:
>   - Image 'main-section' is missing external blobs and is
> non-functional: opensbi
>   - Image 'main-section' has faked external blobs and is
> non-functional: fw_dynamic.bin
> - Ignoring the warning and still flashing the image I dont get any
> output from opensbi.

The error message looks like the fw_dynamic.bin is not copied to top
directory of U-boot, so a dummy one is created.
The load/entry addresses and binary of OpenSBI can be observed by using
`dtc u-boot.itb`.

> Am I missing something here?
> 
> Cheers,
> Prabhakar
>

Best regards,
Peter Lin