[U-Boot] Cyclone 5 U-boot 2015.10

[Marek Vasut <marex@denx.de>]

On Tuesday, November 17, 2015 at 04:03:03 PM, Simon Brown wrote:
> Ok, that seems to have helped - I think one problem I had was using
> u-boot.img, not u-boot-dtb.img - what is the difference?

The later has the device tree attached to the end of the binary,
the former does not.

> It now prints the U-boot startup prompt, followed by some information about
> setup, up to DRAM: 1 GiB
> then it says "Error binding driver 'gpio-dwapb'" three times, followed by
> 
> some other error messages:
> >Some drivers failed to bind
> >Error binding driver 'generic_simple_bus'
> >Some drivers failed to bind
> 
> finishing with "initcall sequence 3ffb1ce4 failed at call
> 010031bf(err=-1)".

Is this stock 2015.10 or u-boot/master ?

> As regards not configuring SD card until after we boot - we made the
> decision to use an EMMC chip rather than an SD card, but no means of
> programming it without Linux!

Oh, we do the same on MCVEVK. At one point, I just cooked stripped down
version of U-Boot with USB mass storage support and placed that into
RAM cells in the FPGA. Then I made the SoCFPGA boot from FPGA.

The MCVEVK behaves as a USB stick and the eMMC is the backing store.

> Anyway, will try and workout what the above errors signify.
> Kind regards,
> 
> Simon
> 
> On 17 November 2015 at 14:18, Marek Vasut <marex@denx.de> wrote:
> > On Tuesday, November 17, 2015 at 02:08:21 PM, Simon Brown wrote:
> > > Hi,
> > 
> > Hi,
> > 
> > > I've been in discussion with Marek on this issue, and he suggested I
> > > post to the u-boot mailing list.
> > > 
> > > I've git cloned uboot 2015.10 and checked it out in my own branch.  I
> > > wasn't about to submit anything back, but this way I hopefully wouldn't
> > > break anything if I did!
> > > 
> > > I've created a new board, "Axim".  I've setup the DTS, Kconfig,
> > > defconfig files etc similar to the Atlas board addition, and things
> > > are compiling ok.  However, when I run U-boot it gets to a relatively
> > > early point and then says "### ERROR ### Please reset the board ###". 
> > > I can't see it say this ,as it no longer talks to the UART, but I can
> > > see that it points to the memory address containing this string in the
> > > debugger, so assume
> > 
> > that's
> > 
> > > what it prints out, before entering an endless loop.
> > > 
> > > My setup is slightly odd, in that I need to get U-boot running before I
> > 
> > can
> > 
> > > configure an SD card.
> > 
> > Why ?
> > 
> > > This means I'm programming my FPGA via JTAG, then
> > > loading the preloader with the ARM DS-5 debugger via JTAG and running
> > > it.
> > 
> > OK, so what I suggest you do (to make things easy) is:
> > 
> > 1) edit arch/arm/mach-socfpga/spl.c
> > 2) locate board_init_f()
> > 3) Add the following code all the way to the end of board_init_f() (which
> > is,
> > 
> >    incidentally, at the end of the file):
> >    asm volatile("x: b x");
> > 
> > This will make sure that the SPL starts spinning in an endless loop at
> > this point. Once you load this modified SPL with your debugger, it will
> > init the hardware, but it won't do anything funny anymore.
> > 
> > So once your hardware is running, load U-Boot (u-boot-dtb.bin) to
> > 0x01000040
> > and execute it from that address. This should get you the prompt.
> > 
> > > I get output on the UART (via FPGA pins), to my PC, to suggest that all
> > 
> > is
> > 
> > > running well.  I can then upload my u-boot.img file to the preloader
> > 
> > using
> > 
> > > Ymodem (preloader configured to accept this), and I can run U-boot.
> > > 
> > > Before I was using the preconfigured 2013.01.01 U-boot as provided on
> > > Rocketboards.org, but since we are using the KSZ9031 chip for our PHY
> > 
> > felt
> > 
> > > I needed a newer version to support this.  But 2013.01.01 runs ok, and
> > > I can get to the U-boot prompt on the UART, whereas 2015 hangs.
> > > 
> > > Any clues gratefully received.
> > 
> > Try the above method, hope that helps.
> > 
> > Best regards,
> > Marek Vasut