* How to make a memory region to be cache disabled ? Cpu is mpc82XX or mpc83XX.
@ 2012-03-14 2:37 hellohello
2012-03-14 4:34 ` Vineeth
2012-03-14 5:09 ` tiejun.chen
0 siblings, 2 replies; 3+ messages in thread
From: hellohello @ 2012-03-14 2:37 UTC (permalink / raw)
To: linuxppc-dev
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: How to make a memory region to be cache disabled ? Cpu is mpc82XX or mpc83XX.
2012-03-14 2:37 How to make a memory region to be cache disabled ? Cpu is mpc82XX or mpc83XX hellohello
@ 2012-03-14 4:34 ` Vineeth
2012-03-14 5:09 ` tiejun.chen
1 sibling, 0 replies; 3+ messages in thread
From: Vineeth @ 2012-03-14 4:34 UTC (permalink / raw)
To: hellohello; +Cc: linuxppc-dev
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You can disable the cache with the help of TLBs. See where it is creating
TLBs for the memory regions for that processor.
On Wed, Mar 14, 2012 at 8:07 AM, hellohello <hellohello008@163.com> wrote:
> How to make a memory region to be cache disabled in linux?
> I'm porting mpc83XX from vxworks to linux. Now meet a question: Cpu use a
> memory region (GPCM mode of bus) to access peripherals, we need this
> memory to be cache disabled.
> Linux Kernel is 2.6.25.
> Thanks very much for any hint!
>
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
>
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: How to make a memory region to be cache disabled ? Cpu is mpc82XX or mpc83XX.
2012-03-14 2:37 How to make a memory region to be cache disabled ? Cpu is mpc82XX or mpc83XX hellohello
2012-03-14 4:34 ` Vineeth
@ 2012-03-14 5:09 ` tiejun.chen
1 sibling, 0 replies; 3+ messages in thread
From: tiejun.chen @ 2012-03-14 5:09 UTC (permalink / raw)
To: hellohello; +Cc: linuxppc-dev
hellohello wrote:
> How to make a memory region to be cache disabled in linux?
> I'm porting mpc83XX from vxworks to linux. Now meet a question: Cpu use a memory region (GPCM mode of bus) to access peripherals, we need this memory to be cache disabled.
> Linux Kernel is 2.6.25.
> Thanks very much for any hint!
ioremap() is fine enough since it always set I|G as TLB entry attribute.
Tiejun
^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-03-14 2:37 How to make a memory region to be cache disabled ? Cpu is mpc82XX or mpc83XX hellohello
2012-03-14 4:34 ` Vineeth
2012-03-14 5:09 ` tiejun.chen
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