[U-Boot] Automated/remote flashing of R-Car3

[Eugeniu Rosca]

Hi Marek,

Thanks for the swift reply and for the useful references/links.

On Tue, May 07, 2019 at 03:23:12PM +0200, Marek Vasut wrote:
> On 5/7/19 12:41 PM, Eugeniu Rosca wrote:
> > Dear Marek, dear Kieran,
> 
> Hi,
> 
> [...]
> 
> > 1.c Use OpenOCD
> > + Presumably same advantages as using a Lauterbach
> > + Based on Kieran's https://github.com/kbingham/renesas-jtag
> >   and on Adam's https://github.com/ntfreak/openocd/commit/1afec4f561392
> >   the solution is currently in use.
> > ? Any ideas on the model/price of the JTAG adapter?
> 
> Any FT2232H (the H is important, due to MPSSE) works.
> I like Flyswatter2 from TinCanTools.
> 
> > ? Not tested. Any patches needed on top of vanilla OpenOCD?
> 
> http://openocd.zylin.com/5149 and related ones, it adds RPC HF support.
> However, there are two problems with this:
> 1) Even with buffered write, the programming is slow
>    - This could be improved by running code on one of the Gen3 CPUs
>      instead of whacking registers via JTAG adapter. I believe that's
>      what lauterbach and everyone else does too. The data upload to
>      SRAM/DRAM is fast via JTAG, register IO is not great.
> 2) LifeC locks the RPC HF access
>    - This is a problem, since the JTAG probe cannot access it once
>      it's locked. There might be a way around it, but it's rather
>      nasty -- use boundary scan test mode to either flip MD pins or
>      access the HF bus directly and bitbang at least erase command
>      to wipe the first few sectors, then reset the CPU and have it
>      drop to SCIF loader mode, then stop the CPU and reprogram the
>      HF (since the SCIF loader runs in EL3 and does not touch the
>      lifec settings.
> 
> Neither of 1) and 2) is implemented, but can be implemented if there is
> interest.

1) looks like a performance issue to me (suboptimal flashing time).
To be honest, I don't think this is a deal-breaker, assuming that
erasing/re-writing the whole 64MiB HF doesn't exceed ~10-15min.
It is also my understanding this is subject of future optimization.

2) looks like a functional issue (insufficient permission to
write-access HF). To make things clear, could you please stress if
http://openocd.zylin.com/5149 already allows updating ATF/U-Boot/OPTEE
on HF of R-Car Gen3 or is it still awaiting some fixes?

> 
> > 1.d. Use CPLD Configurator
> > + H3_M3_StarterKit_Configurator.exe is a Windows tool shipped by
> >   Renesas, hence readily available, which allows to modify the MD
> >   pins, to conveniently switch between QSPI/Hyperflash/SCIF
> >   boot mode from a GUI
> > + Most of the advantages pointed out above
> > - ULCB-only solution (i.e. does not apply to Salvator-X)
> > - Requires a Windows host
> 
> Where can I obtain this and are there sources / documentation available?

I am able to find below related package freely available:
https://elinux.org/File:H3_StarterKit_CPLD_Update_20190408.zip

Unfortunately, it doesn't include H3_M3_StarterKit_Configurator.exe.
The user who uploaded the file is https://elinux.org/User:RenesasJa.
Are you aware of any messaging/commenting feature on elinux.org?
If not, I hope Michael (CC-ed) can answer your question. Hopefully
he sees this message. If not, I can forward your question to him via
mantis.

Thank you!

> 
> -- 
> Best regards,
> Marek Vasut

-- 
Best Regards,
Eugeniu.