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 for kexec@lists.infradead.org; Tue, 27 Jun 2017 08:54:48 +0000
Date: Tue, 27 Jun 2017 09:53:59 +0100
From: Russell King <rmk@armlinux.org.uk>
Subject: Re: [PATCH] kexec:arm: support zImage with appended device tree
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To: Hoeun Ryu <hoeun.ryu@gmail.com>
Cc: Matthew Leach <matthew.leach@arm.com>, Simon Horman <horms@verge.net.au>, Dave Young <dyoung@redhat.com>, kexec@lists.infradead.org, Wang Nan <wangnan0@huawei.com>

On Tue, Jun 27, 2017 at 11:36:43AM +0900, Hoeun Ryu wrote:
> We have some cases when we would like to use different dtb from the
> running system when using kexec and I think that's why kexec-tools
> supports --dtb command line option.
> 
> For example, I have the second kernel for the crash dump with different
> kernel configuration and the different dtb from the running system. I'd
> like to exclude some nodes/properties from dtb like memory reservations
> or unnecessary devices to keep the second kernel/dtb minimal.
> 
> The concatenated zImage for arm has a benefit (whether it's intended or
> not) to make it possible for users to merge multiple boot images into a
> simple single file.
> What I'd like to do is just to support the concatenated zImage so that
> users can use --load(-panic) zImage_with_dtb_from_the_running_system
> instead of --load(-panic) zImage --dtb
> different_dtb_from_the_running_system.

Don't you mean --load(-panic) zImage_with_different_dtb_from_the_running_system
?

So, what you seem to be saying is that you think it's easier for the user
to do this:

# cat zImage some-other-dtb > zImage.dtb
# kexec --load-panic zImage.dtb

rather than:

# kexec --load-panic zImage --dtb some-other-dtb

?

What about the initrd?  Do you want to append that as well?

-- 
Russell King

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