From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: Baoquan He <bhe@redhat.com>
Cc: Huacai Chen <chenhc@lemote.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Eric Biederman <ebiederm@xmission.com>,
Dave Young <dyoung@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
"open list:MIPS" <linux-mips@vger.kernel.org>,
kexec@lists.infradead.org, Fuxin Zhang <zhangfx@lemote.com>,
Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: Re: [PATCH 1/3] MIPS: Crash kernel should be able to see old memories
Date: Sat, 3 Oct 2020 22:07:05 +0100 (BST) [thread overview]
Message-ID: <alpine.LFD.2.21.2010032200470.333514@eddie.linux-mips.org> (raw)
In-Reply-To: <20200923030847.GM25604@MiWiFi-R3L-srv>
On Wed, 23 Sep 2020, Baoquan He wrote:
> > > And we don't have mem=X@Y, only mem=nn[KMG].
> > The relocatable kernel of MIPS is still unusable now, so MIPS should
> > use mem=X@Y, and the crash kernel is always different from normal
> > kernel.
>
> Interesting. Seems MIPS does support mem=X@Y, even though the document
> of 'mem=' says it's used to specify amount of memory, but not memory
> region. Anyway, leave this to mips reviewers, thanks for replying.
>
> ~~~~~~~~~~~~~~~~~~~
> mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory
> Amount of memory to be used in cases as follows:
Yep, I implemented it for the DECstation back in 2000:
commit 97b7ae4257ef7ba8ed9b7944a4f56a49af3e8abb
Author: Ralf Baechle <ralf@linux-mips.org>
Date: Mon Dec 11 16:41:05 2000 +0000
Memmap fixes from Maciej.
(from the LMO repo) in line with the x86 syntax. I don't know why it
hasn't ever been documented in "Kernel Parameters" (for any port), but I'm
fairly sure it has been somewhere.
FWIW,
Maciej
next prev parent reply other threads:[~2020-10-03 21:07 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-23 2:30 [PATCH 1/3] MIPS: Crash kernel should be able to see old memories Huacai Chen
2020-09-23 2:30 ` [PATCH 2/3] MIPS: Reserve extra memory for crash dump Huacai Chen
2020-09-23 2:30 ` [PATCH 3/3] MIPS: Loongson64: Add kexec/kdump support Huacai Chen
2020-09-23 3:35 ` Jinyang He
2020-09-24 0:31 ` Huacai Chen
2020-09-23 13:35 ` Jiaxun Yang
2020-09-24 1:19 ` Huacai Chen
2020-09-24 1:48 ` Jiaxun Yang
2020-09-24 2:15 ` Jinyang He
2020-09-23 2:45 ` [PATCH 1/3] MIPS: Crash kernel should be able to see old memories Baoquan He
2020-09-23 2:58 ` Huacai Chen
2020-09-23 3:08 ` Baoquan He
2020-10-03 21:07 ` Maciej W. Rozycki [this message]
2020-10-05 0:40 ` Maciej W. Rozycki
2020-09-23 3:02 ` Jinyang He
2020-09-23 3:13 ` Huacai Chen
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