linux-kernel - Re: Status of 'cris' architecture support in Linux kernel

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Message-ID: <20140831183342.GA25437@ravnborg.org>
Date:	Sun, 31 Aug 2014 20:33:42 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel@...r.kernel.org, linux-cris-kernel@...s.com,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Mikael Starvik <starvik@...s.com>,
	Grant Likely <grant.likely@...aro.org>,
	"Edgar E. Iglesias" <edgar.iglesias@...il.com>
Subject: Re: Status of 'cris' architecture support in Linux kernel

On Sun, Aug 31, 2014 at 10:50:10AM -0700, Guenter Roeck wrote:
> The idea was to create a crisv32 kernel and initramfs to work with qemu
> for the ongoing Linux kernel test project.
> 
> After spending a number of days (and nights) on it, the results don't look
> very encouraging.
> 
> My overall conclusion is that 'cris' architecture support in the Linux kernel
> is in bad shape, does not work anymore, and would require substantial effort
> to get it into working state.
> 
> Anyway, below are my individual findings. If there is an ongoing effort to
> improve cris support in the upstream kernel, specifically support for crisv32,
> please let me know. I'll be happy to test the resulting kernels.

Jesper is on parental leave so do not expect any prompt reply from him.

> 
> Individual findings:
> 
> headers_install
> 
> make ARCH=cris INSTALL_HDR_PATH=/tmp headers_install
> 
> results in:
> 
> ./scripts/Makefile.headersinst:14: arch/cris/include/uapi/asm/arch-v10/Kbuild:
> 	No such file or directory
> make[2]: *** No rule to make target `arch/cris/include/uapi/asm/arch-v10/Kbuild'.  Stop.
I have already sent a fix for this that Michael said he wanted to deal with.

	Sam
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