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From: Ilias Apalodimas <ilias.apalodimas@linaro.org>
To: Zong Li <zong.li@sifive.com>
Cc: trini@konsulko.com, mark.kettenis@xs4all.nl,
	"Bharat Gooty" <bharat.gooty@broadcom.com>,
	"Rayagonda Kokatanur" <rayagonda.kokatanur@broadcom.com>,
	"Rick Chen" <rick@andestech.com>, Leo <ycliang@andestech.com>,
	"Thomas Fitzsimmons" <fitzsim@fitzsim.org>,
	"Simon Glass" <sjg@chromium.org>, "Bin Meng" <bmeng.cn@gmail.com>,
	"Marek Behún" <marek.behun@nic.cz>,
	"Green Wan" <green.wan@sifive.com>,
	"Sean Anderson" <seanga2@gmail.com>, "Lukas Auer" <lukas@auer.io>,
	"Brad Kim" <brad.kim@semifive.com>,
	"Heinrich Schuchardt" <xypron.glpk@gmx.de>,
	"David Abdurachmanov" <david.abdurachmanov@sifive.com>,
	"Dimitri John Ledkov" <dimitri.ledkov@canonical.com>,
	"U-Boot Mailing List" <u-boot@lists.denx.de>
Subject: Re: [PATCH 1/3] treewide: Remove OF_PRIOR_STAGE from RISC-V boards
Date: Wed, 29 Sep 2021 12:02:16 +0300	[thread overview]
Message-ID: <YVQrmIp7SNDzjwKl@apalos.home> (raw)
In-Reply-To: <CANXhq0oMp=GaaNSd3jhMx04oJe5f+Y7U8MYSfgTbFefNDTD1ew@mail.gmail.com>

Hi Zong, 

[...]

> > diff --git a/board/sifive/unleashed/unleashed.c b/board/sifive/unleashed/unleashed.c
> > index 8cd514df3005..7e89c3f740a7 100644
> > --- a/board/sifive/unleashed/unleashed.c
> > +++ b/board/sifive/unleashed/unleashed.c
> > @@ -116,12 +116,10 @@ int misc_init_r(void)
> >
> >  void *board_fdt_blob_setup(void)
> >  {
> > -       if (IS_ENABLED(CONFIG_OF_SEPARATE)) {
> > -               if (gd->arch.firmware_fdt_addr)
> > -                       return (ulong *)gd->arch.firmware_fdt_addr;
> > -               else
> > -                       return (ulong *)&_end;
> > -       }
> > +       if (gd->arch.firmware_fdt_addr)
> > +               return (void *)gd->arch.firmware_fdt_addr;
> > +       else
> > +               return (void *)&_end;
> >  }
> 
> I was wondering if we need to check CONFIG_OF_BOARD here? I'm not sure
> whether we should distinguish the value of a1 register which is
> meaningless. It means that if we don't expect the device tree to be
> passed by prior stage, then the a1 register might be a trash value at
> the beginning, so it would still return the arch.firmware_fdt_addr
> here, rather than _end. 

I thought about it as well.  Those boards were configured up to now with
'CONFIG_OF_SEPARATE'.  Which means we are looking at an existing issue?
IOW the device tree was passed as part of U-Boot,  which would mean a1 would
have had thrash as well.  Maybe a1 always has a valid DT on those boards
so we never noticed?


> And do you think that we should enable the
> CONFIG_OF_BOARD for unmatched and unleashed? Because it seems to me
> that we actually pass the device tree by prior stage (i.e. OpenSBI).

Yes in that case what you request makes sense for unmatched/unleashed.
Return gd->arch.firmware_fdt_addr in OF_BOARD is selected otherwise return
_end (instead of the current check).
If that sounds good to you I'll send a v2

[...]

Regards
/Ilias

  reply	other threads:[~2021-09-29  9:02 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-27  6:47 Ilias Apalodimas
2021-09-27  6:47 ` [PATCH 2/3] board: arm: Remove OF_PRIOR_STAGE Ilias Apalodimas
2021-09-27 20:15   ` Simon Glass
2021-09-27  6:47 ` [PATCH 3/3] treewide: " Ilias Apalodimas
2021-09-27 20:15   ` Simon Glass
2021-09-27 20:14 ` [PATCH 1/3] treewide: Remove OF_PRIOR_STAGE from RISC-V boards Simon Glass
2021-09-29  8:33 ` Zong Li
2021-09-29  9:02   ` Ilias Apalodimas [this message]
2021-09-29 10:17     ` Ilias Apalodimas
2021-09-29 11:51       ` Zong Li
2021-09-29 12:55         ` Ilias Apalodimas
2021-09-29 12:59           ` Mark Kettenis
2021-09-29 13:11             ` Ilias Apalodimas

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