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Date: Mon, 11 Jun 2018 08:31:52 +0200
From: Sascha Hauer <s.hauer@pengutronix.de>
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Subject: Re: Oftree from memory and access to start arguments
To: Pascal Vizeli <pvizeli@syshack.ch>
Cc: barebox@lists.infradead.org

On Fri, Jun 08, 2018 at 01:03:11AM +0200, Pascal Vizeli wrote:
> Hi Sascha,
> 
> I wrote a patch they do that what you have suggest. It write the dtb
> from memory into a file.
> 
> My problem is, I don't know how I can share data between PBL and the
> main process?
> That are not the same binary, so I can't use extern keyword and on
> this early boot step I don't know how I can access to memory.
> I think with a simple pointer, I can't access to a memory area they
> are not my own?

I have a patch in the queue that shall solve this problem, but I never
came to it to make it ready. So far I would recommend some internal SRAM
to store a pointer. Another possibility would be to pass some less
memory to barebox_arm_entry() and pick up the data there. (I would
recommend at least 4k of memory to steal)

Sascha

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