linux-kernel - Re: [PATCH] remoteproc: imx_rproc: correct i.MX93 DRAM mapping

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Message-ID: <20221115183304.GB61935@p14s>
Date:   Tue, 15 Nov 2022 11:33:04 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Peng Fan <peng.fan@....com>
Cc:     "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "andersson@...nel.org" <andersson@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] remoteproc: imx_rproc: correct i.MX93 DRAM mapping

On Mon, Nov 07, 2022 at 12:27:58AM +0000, Peng Fan wrote:
> 
> 
> > -----Original Message-----
> > From: Mathieu Poirier <mathieu.poirier@...aro.org>
> > Sent: 2022年11月4日 23:28
> > To: Peng Fan <peng.fan@....com>
> > Cc: Peng Fan (OSS) <peng.fan@....nxp.com>; andersson@...nel.org;
> > shawnguo@...nel.org; s.hauer@...gutronix.de; kernel@...gutronix.de;
> > festevam@...il.com; dl-linux-imx <linux-imx@....com>; linux-
> > remoteproc@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> > kernel@...r.kernel.org
> > Subject: Re: [PATCH] remoteproc: imx_rproc: correct i.MX93 DRAM mapping
> > 
> > On Thu, Nov 03, 2022 at 06:11:46AM +0000, Peng Fan wrote:
> > > > Subject: Re: [PATCH] remoteproc: imx_rproc: correct i.MX93 DRAM
> > > > mapping
> > > >
> > > > On Wed, 2 Nov 2022 at 05:12, Peng Fan (OSS) <peng.fan@....nxp.com>
> > > > wrote:
> > > > >
> > > > > From: Peng Fan <peng.fan@....com>
> > > > >
> > > > > According to updated reference mannual, the M33 DRAM view of
> > > > > 0x[C,D]0000000 maps to A55 0xC0000000, so correct it.
> > > > >
> > > > > Fixes: 9222fabf0e39 ("remoteproc: imx_rproc: Support i.MX93")
> > > > > Signed-off-by: Peng Fan <peng.fan@....com>
> > > > > ---
> > > > >  drivers/remoteproc/imx_rproc.c | 4 ++--
> > > > >  1 file changed, 2 insertions(+), 2 deletions(-)
> > > > >
> > > > > diff --git a/drivers/remoteproc/imx_rproc.c
> > > > > b/drivers/remoteproc/imx_rproc.c index 2c471e46f4ca..9fc978e0393c
> > > > > 100644
> > > > > --- a/drivers/remoteproc/imx_rproc.c
> > > > > +++ b/drivers/remoteproc/imx_rproc.c
> > > > > @@ -134,8 +134,8 @@ static const struct imx_rproc_att
> > > > imx_rproc_att_imx93[] = {
> > > > >         { 0x80000000, 0x80000000, 0x10000000, 0 },
> > > > >         { 0x90000000, 0x80000000, 0x10000000, 0 },
> > > > >
> > > > > -       { 0xC0000000, 0xa0000000, 0x10000000, 0 },
> > > > > -       { 0xD0000000, 0xa0000000, 0x10000000, 0 },
> > > > > +       { 0xC0000000, 0xC0000000, 0x10000000, 0 },
> > > > > +       { 0xD0000000, 0xC0000000, 0x10000000, 0 },
> > > >
> > > > But how did this work before?  Were some SoC released with the old
> > > > mapping?
> > 
> > As it is regularly the case, you have not answered all my questions.
> 
> The DRAM mapping was not tested, I just wrote them down according
> to the information I had.  In this patch, I just fix the mapping at address
> 0xC0000000, I not add 0xA0000000, I may also add it or use a separate
> patch, which would you prefer?

Seperate patch?  This is a seperate patch...

> 
> The i.MX93 SoC is still in pre-production phase, and there is no public
> Information for now.
>

That is all I wanted to know.  Other implementation can't be affected by this
change because the sillicon is still under development.  Simple isn't?

I am applying this patch.

> Regards,
> Peng.
> > 
> > > The current m33 firmware release with Linux SDK only has TCM version,
> > > so I not have image to test the DDR mapping.
> > >
> > > Initially we got the information that M33 mapping of DRAM.
> > > DRAM (offset 0 MB)	DRAM	80000000
> > > DRAM (offset 256 MB)	DRAM	A0000000
> > > DRAM (offset 512 MB)	DRAM	C0000000
> > >
> > > However the information is wrong after we check more, there is an
> > > 256MB hole, 0MB [0x80000000, 0x8fffffff], 512MB [0xa0000000,
> > > 0xafffffff], 1024MB [0xc0000000, 0xcfffffff]
> > >
> > > I use JTAG to confirm it.
> > >
> > > Thanks,
> > > Peng.
> > > >
> > > > >  };
> > > > >
> > > > >  static const struct imx_rproc_att imx_rproc_att_imx8qm[] = {
> > > > > --
> > > > > 2.37.1
> > > > >