[U-Boot] SPL and DM on ZYNQ

[Hannes Schmelzer <hannes@schmelzer.or.at>]

> Hi,
Hi Simon,

many thanks for reply.
>
>>> (....)
>>>
>>> maybe there is yet another switch, which needs to be turned on.
>>> Subject of suspicion is currently "support simple-bus driver in SPL". But
>>> if i compile with this option,
>>> boot ends up with:
>>>
>>> U-Boot SPL 2015.10-rc4-00101-gb6dcb3f-dirty (Oct 08 2015 - 09:01:35)
>>> mmc boot
>>> boot device - 1
>>> mmc_init: 0, time 58
>>> spl: mmc boot mode: fs
>>> reading system.dtb
>>> Error: allocating memory
>>> spl_load_image_fat_os: error reading image system.dtb, err - -1
>>> reading u-boot-dtb.img
>>> Error: allocating memory
>>> spl_load_image_fat: error reading image u-boot-dtb.img, err - -1
>>> spl: mmc: no boot mode left to try
>>> ### ERROR ### Please RESET the board ###
>> This is because there is only very limited heap (0x1000) enabled in
>> zynq-common.h and therefore the FAT buffers cannot be allocated -> solved.
> You may be able to use CONFIG_SPL_STACK_R here.
i will check this.
>
>> Further i've found out that my board isn't booting from SPI because there
>> is nothing within "SPL-devicetree" about QSPI.
>>
>> Can anyone explain me how the "normal" and the "SPL" devicetree is separated
>> ?
> Yes you can add the 'u-boot,dm-pre-reloc' property to a node. See the
> driver-model README.txt (although it does not explicitly mention SPL
> at present). It will then appear in the SPL device tree.
I've found out this and added the property to the device-tree, the 
device appaers now in the spl DTB.
But unfortunately i still cannot boot from QSPI flash - i am currently 
debugging this.

Did anyone boot yet some ZYNQ from the QSPI flash ?
>
>> best regards,
>> Hannes
>>
> Regards,
> Simon
regards,
Hannes