linux-kernel - RE: [PATCH] soc: imx: Makefile: only build soc-imx8 when CONFIG

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Message-ID: <AM0PR04MB44813F8292A36D84B3F80AEA88FE0@AM0PR04MB4481.eurprd04.prod.outlook.com>
Date:   Mon, 9 Mar 2020 13:28:32 +0000
From:   Peng Fan <peng.fan@....com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Adam Ford <aford173@...il.com>, Abel Vesa <abel.vesa@....com>,
        Anson Huang <anson.huang@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Leonard Crestez <leonard.crestez@....com>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] soc: imx: Makefile: only build soc-imx8 when CONFIG_ARM64

Hi Arnd,

> Subject: Re: [PATCH] soc: imx: Makefile: only build soc-imx8 when
> CONFIG_ARM64
> 
> On Mon, Jan 27, 2020 at 6:05 AM Peng Fan <peng.fan@....com> wrote:
> > > Subject: Re: [PATCH] soc: imx: Makefile: only build soc-imx8 when
> > > Does anyone have any suggestions on where I might find some generic
> > > stuff for either iMX8M or generic ARMv8 docs for doing something like
> this?
> >
> > We did a porting for one customer, but code is not public available.
> >
> > First let uboot switch to AARCH32 mode when booting Linux, this is
> > already supported by uboot mailine.
> >
> > Second, create a mach-imx8m.c under arch/arm/mach-imx to handle
> i.MX8M
> > just like other i.mx arm32 socs. This is not preferred by Linux community.
> >
> > 3rd, build i.MX8M drivers when using imx_v7_defconfig( or
> > imx_v6_v7_defconfig in upstream)
> 
> I think the third part is something we can clearly do once it actually boots.
> 
> Can you post the patch for the second part for reference? In theory nothing
> should be necessary there, so I wonder what I'm missing (as we need no code
> for arch/arm64) and what we can do differently to make it work out of the
> box.
> 
> Is the problem that the SMP bringup using PSCI for arm64 doesn't work with
> the 32-bit kernel for some reason?

Sorry for long time delay. I forgot your mail. I did some try again, seems only need
the following piece code to make it boot, also select GIC_V3 and drop some ARM64
dependencies in Kconfig for some i.MX drivers.
Need some addition work in ATF/U-Boot
to make smp work, that is not Linux related.

+static const char *const imx8mm_dt_compat[] __initconst = {
+       "fsl,imx8mm",
+       NULL,
+};
+
+#include <asm/mach/arch.h>
+DT_MACHINE_START(IMX7D, "Freescale i.MX8MM (Device Tree)")
+       .dt_compat      = imx8mm_dt_compat,
+MACHINE_END


Are you ok we add such piece code in drivers/soc/imx/soc-imx8.c to support
aarch32 linux?

Thanks,
Peng.
> 
>       Arnd