Docs for RISC-V

[Leo Liang]

Hi Simon,

On Thu, Feb 02, 2023 at 10:25:36AM -0700, Simon Glass wrote:
> Hi,
> 
> On Thu, 2 Feb 2023 at 10:18, Simon Glass <sjg at chromium.org> wrote:
> >
> > Hi Rick & Leo,
> >
> > I see docs for one board at [1] but I'm not sure what to do with unleashed.
> >
> > It seems to need a 'genimage' tool, going on what I see in CI.
> >

It does seem like that accroding to "sifive_unleashed_sdcard test.py".
(https://source.denx.de/u-boot/custodians/u-boot-riscv/-/jobs/568342)

> > Could you adjust it to use binman to output an image suitable for
> > writing to an SD card in a single 'dd' step, as Rockchip does?
> >

I think I will both take a look at it and forward this message to guys at sifive.

> > Also, how about adding a RISC-V section here?
> >
> > https://u-boot.readthedocs.io/en/latest/arch/index.html
> >

Sounds great!
I will reference what other architectures have and create a RISC-V section.

> 
> Also I notice that this is incorrect:
> 
> https://u-boot.readthedocs.io/en/latest/board/sifive/unleashed.html?highlight=fw_dynamic.bin
> 
> since 'make PLATFORM=generic' gives errors. I think it needs CROSS_COMPILE
> 

There is already an 'export CROSS_COMPILE' in the previous "building" section 
before 'make PLATFROM=generic', so I guess that is why CROSS_COMPILE is omitted in make command.

> One other thing...binman output is this:
> 
> binman: Filename 'fw_dynamic.bin' not found in input path (...)
> 
> You should add something to tools/binman/missing-blob-help so that it
> tells the user where to find the blob.
> 

Same as the above, I will forward this to guys at sifive to see what they would like to do.


Thanks for all the catches!
Best regards,
Leo

> Thanks again,
> Simon
> 
> > Thanks,
> > Simon
> >
> > [1] https://u-boot.readthedocs.io/en/latest/board/sifive/unmatched.html