Re: Linux on sparc v7

[Julian Calaby <julian.calaby@xxxxxxxxx>]

Hi,

On Tue, May 22, 2012 at 4:28 PM, Daniel Hellstrom <daniel@xxxxxxxxxxx> wrote:
> On 05/21/2012 06:16 PM, Sam Ravnborg wrote:
>>
>> On Mon, May 21, 2012 at 04:14:20PM +0200, Daniel Hellstrom wrote:
>>>
>>> Hello Dave,
>>>
>>> I am trying to catch up on what has been happening lately with the sparc
>>> port. Have the latest patches removed support for SPARC V7 CPUs?
>>
>> Yes. The sun4c were the only users of v7 so today we tell gcc to generate
>> v8
>> code. This imply support for muldiv&  friends.
>>
>>
>> > From the sparc Makefile:
>>
>>     KBUILD_CFLAGS  += -mcpu=v8
>
>
> Does this mean that if we change it to mcpu=v7 or mcpu=cypress (or removing
> mcpu=v8) the kernel can still be run on a V7 CPU? Or have software routines
> for making V8 mul/div operations on a V7 CPU been removed so that V7 CPUs
> can't run Linux regardless of compiler option?

As I understand it, all support for v7 CPUs, including the mul/div
routines has been annihilated.

So from 3.5 onwards, Linux required a v8 CPU or newer.

Thanks,

-- 
Julian Calaby

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