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From: Jiaxun Yang <jiaxun.yang@flygoat.com>
To: Huacai Chen <chenhc@lemote.com>,
	Ralf Baechle <ralf@linux-mips.org>,
	James Hogan <jhogan@kernel.org>
Cc: Paul Burton <paul.burton@mips.com>,
	Paul Burton <paulburton@kernel.org>,
	linux-mips@linux-mips.org, linux-mips@vger.kernel.org,
	Fuxin Zhang <zhangfx@lemote.com>,
	Zhangjin Wu <wuzhangjin@gmail.com>,
	Huacai Chen <chenhuacai@gmail.com>
Subject: Re: [PATCH V2] MIPS: Loongson: Add board_ebase_setup() support
Date: Thu, 7 Nov 2019 19:47:07 +0800
Message-ID: <6f6ce0de-bad9-d1c4-f8d6-244b11eef0b1@flygoat.com> (raw)
In-Reply-To: <1572847781-21652-1-git-send-email-chenhc@lemote.com>


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?

--
Jiaxun Yang

  reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-04  6:09 Huacai Chen
2019-11-07 11:47 ` Jiaxun Yang [this message]
2019-11-08  1:21   ` Huacai Chen
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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