Does Linux MIPS use scratch pad ram?

Does Linux MIPS use scratch pad ram?

[Ardelean, Andrei]

Hi,

I am using MALTA platform and try to port Linux on a new platform.
It seems to me that in spram.c the sprams are probed  if they are
available or not but I cannot see Linux really using those afterwards.
My platform has no spram so I am trying to avoid this probing. The
problem is that spram.c is not MALTA specific but as the comment says in
spram.c there are some MALTA specific addresses. Unfortunately I have
some Flash at those addresses.
How to fix this issue?

Thanks,
Andrei
  

Does Linux MIPS use scratch pad ram?

[Ardelean, Andrei]

Hi,

I am using MALTA platform and try to port Linux on a new platform.
It seems to me that in spram.c the sprams are probed  if they are
available or not but I cannot see Linux really using those afterwards.
My platform has no spram so I am trying to avoid this probing. The
problem is that spram.c is not MALTA specific but as the comment says in
spram.c there are some MALTA specific addresses. Unfortunately I have
some Flash at those addresses.
How to fix this issue?

Thanks,
Andrei
  

Re: Does Linux MIPS use scratch pad ram?

[Kevin D. Kissell]

I find it hard to believe that you've got Flash responding in place of 
the CP0 cache tag registers.

On 09/24/10 14:45, Ardelean, Andrei wrote:
> Hi,
>
> I am using MALTA platform and try to port Linux on a new platform.
> It seems to me that in spram.c the sprams are probed  if they are
> available or not but I cannot see Linux really using those afterwards.
> My platform has no spram so I am trying to avoid this probing. The
> problem is that spram.c is not MALTA specific but as the comment says in
> spram.c there are some MALTA specific addresses. Unfortunately I have
> some Flash at those addresses.
> How to fix this issue?
>
> Thanks,
> Andrei
>
>
>    

RE: Does Linux MIPS use scratch pad ram?

[Ardelean, Andrei]

Hi Kevin,

I don't have the new h/w yet so I don't know how the Flash will react.
In the mem map of the new board I see Flash at 0x1c000000 where MALTA
Linux probes for spram and my job so far is to port Linux for the new
board. So, I understand from your email that spram probing will not mess
up with my Flash and I should ignore it.

Thanks,
Andrei


-----Original Message-----
From: Kevin D. Kissell [mailto:kevink@paralogos.com] 
Sent: Friday, September 24, 2010 7:17 PM
To: Ardelean, Andrei
Cc: linux-mips@linux-mips.org
Subject: Re: Does Linux MIPS use scratch pad ram?

I find it hard to believe that you've got Flash responding in place of 
the CP0 cache tag registers.

On 09/24/10 14:45, Ardelean, Andrei wrote:
> Hi,
>
> I am using MALTA platform and try to port Linux on a new platform.
> It seems to me that in spram.c the sprams are probed  if they are
> available or not but I cannot see Linux really using those afterwards.
> My platform has no spram so I am trying to avoid this probing. The
> problem is that spram.c is not MALTA specific but as the comment says
in
> spram.c there are some MALTA specific addresses. Unfortunately I have
> some Flash at those addresses.
> How to fix this issue?
>
> Thanks,
> Andrei
>
>
>    

RE: Does Linux MIPS use scratch pad ram?

[Ardelean, Andrei]

Hi Kevin,

I don't have the new h/w yet so I don't know how the Flash will react.
In the mem map of the new board I see Flash at 0x1c000000 where MALTA
Linux probes for spram and my job so far is to port Linux for the new
board. So, I understand from your email that spram probing will not mess
up with my Flash and I should ignore it.

Thanks,
Andrei


-----Original Message-----
From: Kevin D. Kissell [mailto:kevink@paralogos.com] 
Sent: Friday, September 24, 2010 7:17 PM
To: Ardelean, Andrei
Cc: linux-mips@linux-mips.org
Subject: Re: Does Linux MIPS use scratch pad ram?

I find it hard to believe that you've got Flash responding in place of 
the CP0 cache tag registers.

On 09/24/10 14:45, Ardelean, Andrei wrote:
> Hi,
>
> I am using MALTA platform and try to port Linux on a new platform.
> It seems to me that in spram.c the sprams are probed  if they are
> available or not but I cannot see Linux really using those afterwards.
> My platform has no spram so I am trying to avoid this probing. The
> problem is that spram.c is not MALTA specific but as the comment says
in
> spram.c there are some MALTA specific addresses. Unfortunately I have
> some Flash at those addresses.
> How to fix this issue?
>
> Thanks,
> Andrei
>
>
>