[U-Boot] Zynq Zybo booting with mainline U-Boot

[Simon Glass]

Hi,

On 3 February 2015 at 03:08, Michal Simek <monstr at monstr.eu> wrote:
> Hi Simon and Masahiro,
>
> On 02/03/2015 08:32 AM, Masahiro Yamada wrote:
>> Hi Simon,
>>
>>
>> On Mon, 2 Feb 2015 22:00:25 -0700
>> Simon Glass <sjg at chromium.org> wrote:
>>
>>> Hi,
>>>
>>> I have one of boards and would like to get mainline U-Boot booting on it.
>>>
>>> I have followed the instructions for creating a BOOT.BIN file comprised of:
>>>
>>> - boot.elf
>>> - .bit file
>>> - u-boot.elf
>>>
>>> and putting it on a a micro-SD card.
>>>
>>> This works OK with the diligent master branch from github. I can boot normally.
>>>
>>> However this is 2013.10. Mainline U-Boot uses device tree so
>>> presumably the elf file does not work. I expect we need to use
>>> u-boot-dtb.bin.
>
> I think the best what you can do is simple disable CONFIG_OF_CONTROL
> from mainline u-boot and do not use now.
> This is what I do in xilinx tree but OF_CONTROL is also working fine
> but needs some setup.
>
>>>
>>> However since this is not an elf file I'm not sure how to build the
>>> image using the 'Create Zynq Boot Image' tool.
>>>
>>> I don't see any instructions in REAME.zynq about how to create an SD card.
>>>
>>> Any pointers please?
>>>
>>
>>
>> I have a Zynq ZC706 board.
>>
>> The follwing is what I tried to run u-boot mainline.
>>
>>
>> I hope it will work for Zybo board, too.
>
> Zybo will be just the same.
>
>>
>>
>> [1] If you are using Xilinx hardware tool (Vivado or ISE)
>>     you can generate  ps7_init.[ch] or ps7_init_gpl.[ch].
>>
>>     Copy the C file and the header into borad/xilinx/zynq directory
>>
>>
>> [2] Build
>>
>>     make zynq_zybo_defconfig  && make
>>
>>
>> [3] Download the python script to generate boot.bin
>>
>>    git clone git://github.com/Xilinx/u-boot-xlnx.git
>>
>>     Copy  tools/zynq-boot-bin.py   to  ~/bin  or somewhere you like
>
>
> In future I want to move this script to be the part of mkimage
> but it has low priority now.
>
>
>
>> [4] Generate boot.bin
>>
>> zynq-boot-bin.py -o boot.bin -u u-boot/spl/u-boot-spl.bin
>>
>>
>> [5] Copy  boot.bin and u-boot-dtb.img  to your SD card
>>
>>
>>
>>
>> Please give it a try.
>>
>> The problem about the instruction above is FPAG bit file is not loaded.
>
> yes - but if you use xilinx tree I have also added support for loading
> bitstream by SPL. I just haven't sent it to mainline yet.
> But you can simple load bitstream in full u-boot which is fully supported
> in mainline.
>
>
>> Another way instead of [4] might be:
>>
>>
>> Describe foo.bif as follows
>>
>> image:
>> {
>>         [bootloader]fsbl.elf
>>         fpga.bit
>>         [load=0x04000000,startup=0x04000000]u-boot/u-boot-dtb.bin
>> }
>>
>> and
>> $ bootgen -image foo.bif -w on -o boot.bin
>>
>
> yes - this should also work.
>
>> I have not working on Zynq these days.
>
> why not? :-)
>
>> I hope Michal can support us.
>
> Simon: Let me know if you need any my help on this.
> I have zybo here that I can try it.

Thanks for your help!

Here's what works for me:

CROSS_COMPILE=/opt/xilinx/SDK/2014.4/gnu/arm/lin/bin/arm-xilinx-linux-gnueabi-
make O=b/zynq_zybo zynq_zybo_defconfig

CROSS_COMPILE=/opt/xilinx/SDK/2014.4/gnu/arm/lin/bin/arm-xilinx-linux-gnueabi-
make O=b/zynq_zybo  -j10 -s

/opt/xilinx/SDK/2014.4/bin/bootgen -image try.bif -w on -o boot.bin;
cp boot.bin  /media/sglass/A097-A1D5/BOOT.bin; cp u-boot-dtb.img
/media/sglass/A097-A1D5/.

try.bif:
image:
{
[bootloader]/vid/software/devel/zynq/play/play.sdk/boot/Debug/boot.elf
/vid/software/devel/zynq/play/play.sdk/design_1_wrapper_hw_platform_0/design_1_wrapper.bit
[load = 0x04000000,startup=0x04000000]/vid/software/devel/zynq/u-boot-dtb.bin
}

I'm a bit unclear why I say u-boot-dtb.bin in the try.big file but it
actually loads u-boot-dtb.img.


If I use the zynq-boot script I can do this:

zynq-boot-bin.py -o boot.bin -u spl/u-boot-spl.bin
cp boot.bin  /media/sglass/A097-A1D5/BOOT.bin; cp u-boot-dtb.img
/media/sglass/A097-A1D5/.

and then I get a message from SPL and it boots also. I'm not sure why.

Regards,
Simon