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From: Huacai Chen <chenhc@lemote.com>
To: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>,
	James Hogan <jhogan@kernel.org>,
	Paul Burton <paul.burton@mips.com>,
	Paul Burton <paulburton@kernel.org>,
	Linux MIPS Mailing List <linux-mips@linux-mips.org>,
	"open list:MIPS" <linux-mips@vger.kernel.org>,
	Fuxin Zhang <zhangfx@lemote.com>,
	Zhangjin Wu <wuzhangjin@gmail.com>
Subject: Re: [PATCH V2] MIPS: Loongson: Add board_ebase_setup() support
Date: Fri, 8 Nov 2019 09:21:51 +0800	[thread overview]
Message-ID: <CAAhV-H4eiwSOpK0qttOT-GiU1=tvrnWxfSPvH2e5umcogyAkaQ@mail.gmail.com> (raw)
In-Reply-To: <6f6ce0de-bad9-d1c4-f8d6-244b11eef0b1@flygoat.com>

Hi, Jiaxun,

On Thu, Nov 7, 2019 at 7:47 PM Jiaxun Yang <jiaxun.yang@flygoat.com> wrote:
>
>
> 在 2019/11/4 下午2:09, Huacai Chen 写道:
> > Old processors before Loongson-3A2000 have a 32bit ebase register and
> > have no WG bit, new processors since Loongson-3A2000 have a 64bit ebase
> > register and do have the WG bit. Unfortunately, Loongson processors
> > which have the WG bit are slightly different from MIPS R2. This makes
> > the generic ebase setup not suitable for every scenarios.
> >
> > To make Loongson's kernel be more robust, we add a board_ebase_setup()
> > hook to ensure that CKSEG0 is always used for ebase. This is also useful
> > on platforms where BIOS doesn't initialise an appropriate ebase.
> >
> > Signed-off-by: Huacai Chen <chenhc@lemote.com>
> > ---
> Acked-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
>
> This patch is essential as most Loongson boards with Tianocore based
> UEFI firmware didn't set their ebase correctly.
>
> Should we backport it to stable?
Yes, this patch should be backported as early as 4.9-lts.

Huacai
>
> --
> Jiaxun Yang

  reply	other threads:[~2019-11-08  1:16 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-04  6:09 [PATCH V2] MIPS: Loongson: Add board_ebase_setup() support Huacai Chen
2019-11-07 11:47 ` Jiaxun Yang
2019-11-08  1:21   ` Huacai Chen [this message]
2019-11-08 19:11 ` Paul Burton
2019-11-09 11:02   ` Huacai Chen
2019-11-15  8:22     ` Huacai Chen

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