linux-kernel - RE: [PATCH] kexec/kdump: Minor Documentation updates for arm64 and Image

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Message-ID: <AM5PR0401MB25453F52820674F1D07EC8569AF80@AM5PR0401MB2545.eurprd04.prod.outlook.com>
Date:   Mon, 22 May 2017 06:49:13 +0000
From:   Bharat Bhushan <bharat.bhushan@....com>
To:     Pratyush Anand <panand@...hat.com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        Dave Young <dyoung@...hat.com>,
        "bhe@...hat.com" <bhe@...hat.com>,
        "vgoyal@...hat.com" <vgoyal@...hat.com>,
        "corbet@....net" <corbet@....net>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] kexec/kdump: Minor Documentation updates for arm64 and
 Image



> -----Original Message-----
> From: Pratyush Anand [mailto:panand@...hat.com]
> Sent: Monday, May 22, 2017 12:09 PM
> To: AKASHI Takahiro <takahiro.akashi@...aro.org>; Dave Young
> <dyoung@...hat.com>; Bharat Bhushan <bharat.bhushan@....com>;
> bhe@...hat.com; vgoyal@...hat.com; corbet@....net;
> kexec@...ts.infradead.org; linux-doc@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH] kexec/kdump: Minor Documentation updates for
> arm64 and Image
> 
> 
> 
> On Friday 19 May 2017 09:15 AM, AKASHI Takahiro wrote:
> >>> +to load dump-capture kernel.
> >>> +
> >>> +   kexec -p <dump-capture-kernel-Image> \
> >>> +   --initrd=<initrd-for-dump-capture-kernel> \
> >>> +   --append="root=<root-dev> <arch-specific-options>"
> >> For uncompressed Image, dtb is not necessary?
> > Just for clarification, dtb is optional for both vmlinux and Image on
> > arm64. (This means you can specify it if you want.) But this is also
> > true for initrd and append(command line) to some extent.
> 
> Yes, I agree.

Should I mention "-dtb" also for "Image"?

Also do we need to mention that it is optional somewhere in this document? I do not see "optional" is mentioned for other parameters and architecture.

Does this looks ok:

	" -dtb=<optional-dtb-for-dump-capture-kernel> \"

Thanks
-Bharat

> >
> > More precisely, whether these parameters are optional or not will
> > depend on architectures, not formats, I believe.
> 
> May be not architecture, rather a distro environment.
> 
> For example, we should be able to work without --initrd for any arch if kernel
> has been compiled by configuring CONFG_INITRAMFS_SOURCE.
> 
> ~Pratyush