linux-kernel - Re: remoteproc: Load coprocessor code to the specific main memory location

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Message-ID: <CAK=WgbYMBDp3Qm8TErNrnDwn2ZTFt62+OuyyQvVE-jrnNsL6kg@mail.gmail.com>
Date:	Fri, 27 Jan 2012 13:38:39 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	monstr@...str.eu
Cc:	LKML <linux-kernel@...r.kernel.org>,
	John Williams <john.williams@...alogix.com>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	"Grosen, Mark" <mgrosen@...com>, Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: remoteproc: Load coprocessor code to the specific main memory location

On Thu, Jan 26, 2012 at 12:44 PM, Michal Simek <monstr@...str.eu> wrote:
> I have one small problem which is that physical address is 0x10000000
> which means that firmware entry point is the same.

This is what we do with the davinci DSPs, too.

> In rproc_load_segments is da composed from phdr->p_paddr which is
> 0x10000000.

Ok, I don't see any issue here.

> And code is designed that this load addr is offset.

Not sure exactly what do you mean by that ?

> Here is the code:
>        /* go through the available ELF segments */
>        for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
>                u32 da = phdr->p_paddr; // OFFSET 0x10000000
>                u32 memsz = phdr->p_memsz;
>
> But for my case is physical address correct and it is not offset 0x10000000.

Again, I'm not sure what exactly is the issue. p_paddr is the physical
address where the image is expected, that sounds ok to me.

Thanks,
Ohad.
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