[Nios2-dev] Device tree flattening code not copying propertiesfrom blob

[Collins, Rod]

It seems to be that any section that blob is loaded into except the
--init section would be ok. The main purpose is to keep it in accessible
memory.

Walter, what are your concerns with moving it to a non __init memory
section? Seems like all of the other approaches essentially are doing
that.

Rod

Rod Collins
Principal Software Engineer
Saab Sensis Corporation
315-445-5784
rodc at saabsensis.com


-----Original Message-----
From: nios2-dev-bounces at sopc.et.ntust.edu.tw
[mailto:nios2-dev-bounces at sopc.et.ntust.edu.tw] On Behalf Of Walter
Goossens
Sent: Wednesday, June 12, 2013 3:13 PM
To: devicetree-discuss at lists.ozlabs.org
Cc: nios2-dev
Subject: Re: [Nios2-dev] Device tree flattening code not copying
propertiesfrom blob

On 06/12/13 20:23, Grant Likely wrote:
> On Wed, Jun 12, 2013 at 6:33 PM, Collins, Rod 
> <Rod.Collins at saabsensis.com> wrote:
>> The blob is built into the zImage.initramfs.gz image which is put 
>> into flash. The zImage.initramfs.gz is self copied from flash to RAM,

>> then uncompressed to the running area. I will dig into the location 
>> of the blob in the image and report back.
> Thanks. If it is appended to the zImage wrapper, then things should be

> fine (this is the expected way to do when not passed in from the 
> bootloader). If a *.dtb.o target has been used to embedded it into the

> kernel-proper (vmlinux) then you will have a problem. The *.dtb.S 
> target puts the dtb data into the dtb.init.rodata section which gets 
> discarded.
>
> g.

Hi Grant,

you're right that's exactly what nios2 is doing...
I guess we could modify the section where it gets loaded but that sounds
to me a bit like a hack... What is the best target to look at for a
clean, similar solution? Arm with CONFIG_ARM_APPENDED_DTB?

Walter
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss at lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
>

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