[U-Boot] SPL and DM on ZYNQ

[Simon Glass]

Hi,

On 9 October 2015 at 08:04, Hannes Schmelzer <hannes at schmelzer.or.at> wrote:
>
>> I've now branched from u-boot-dm.git/zynq-working2 and then merged
>> u-boot-spi/master into it.
>>
>> After a few merge conflicts i'am able to build u-boot and boot it from SD
>> with working DM support during SPL and QSPI support.
>> The next step was/is burning this file into the QSPI flash and boot from
>> it.
>>
>> burning was now problem, but boot ends up with:
>>
>> U-Boot SPL 2015.10-rc4-00101-gb6dcb3f-dirty (Oct 08 2015 - 08:42:53)
>> qspi boot
>> boot device - 8
>> uclass_find_device_by_seq: 0 0
>>    - not found
>> uclass_find_device_by_seq: 1 0
>>    - not found
>> Invalid bus 0 (err=-19)
>> SPI probe failed.
>> ### ERROR ### Please RESET the board ###
>>
>> 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.

>
> 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.

>
> best regards,
> Hannes
>

Regards,
Simon