Re: [PATCH 1/4] unicore32-oldabi: add CONFIG_UNICORE32_OLDABI for distinguishing two ABIs

[Guenter Roeck <linux@roeck-us.net>]

On Fri, Sep 12, 2014 at 02:41:43PM +0800, gxt@mprc.pku.edu.cn wrote:
> From: Guan Xuetao <gxt@mprc.pku.edu.cn>
> 
> Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
> Signed-off-by: Qin Rui <qinrui@pku.edu.cn>

This series lets me build and run an initramfs with the published toolchain,
after adding the patch 'unicore32: Add ocd console and qemu-defconfig
to support qemu simulator' as well to get console output. So feel free
to add

Tested-by: Guenter Roeck <linux@roeck-us.net>

to the series.

I have a couple of questions:

- After adding the patch 'unicore32: Add ocd console and qemu-defconfig
  to support qemu simulator', I only get console output, but no input.
  Is there a way (for example with a qemu command line option) to get
  input as well ?
- Is it possible to connect a console to a serial device in qemu (in other
  words to run the image in qemu without the ocd console patch) ?
- Is there a working description on how to create a toolchain for the _new_
  ABI ? Alternatively, would it be possible to publish such a toolchain ?

Thanks a lot,

Guenter

> ---
>  arch/unicore32/Kconfig | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
> index 928237a..e5d25b4 100644
> --- a/arch/unicore32/Kconfig
> +++ b/arch/unicore32/Kconfig
> @@ -72,6 +72,17 @@ source "kernel/Kconfig.freezer"
>  
>  menu "System Type"
>  
> +config UNICORE32_OLDABI
> +	bool "Allow old ABI binaries to run with this kernel"
> +	default y
> +	help
> +	  This option preserves the old syscall interface instead of the
> +	  asm-generic one. It also provides a compatibility layer to
> +	  intercept syscalls that have structure arguments which layout
> +	  in memory differs between the asm-generic ABI and this old one.
> +
> +	  If in doubt, say Y.
> +
>  config MMU
>  	def_bool y
>  
> -- 
> 2.0.0.GIT
>