> > > GFP_DMA is ISA dma reachable, Forget the IA64, their setup is weird and
> > > should best be ignored until 2.5 as and when they sort it out.
>
> Really ? I don't think I can ignore IA64, there are people who ask for it
Well the current IA64 tree isnt related to the standard Linux beha
> > GFP_DMA is ISA dma reachable, Forget the IA64, their setup is weird and
> > should best be ignored until 2.5 as and when they sort it out.
Really ? I don't think I can ignore IA64, there are people who ask for it
> > > bounce buffers are needed. On Alpha GFP_DMA is not limited at all (I
Alan Cox wrote:
> No ifdefs are needed
>
> GFP_DMA - ISA dma reachable
> pci_alloc_* and friends - PCI usable memory
pci_alloc_* is designed to support ISA.
Pass pci_dev==NULL to pci_alloc_* for ISA devices, and it allocs GFP_DMA
for you.
--
Jeff Garzik | A recent study h
> A problem arises on 64 bit platforms (such as IA64) if your PCI card is only 32bit
>(can
> address the first 4G) and you don't wan't to use bounce buffers. If you use GFP_DMA
>on
GFP_DMA is ISA dma reachable, Forget the IA64, their setup is weird and
should best be ignored until 2.5 as and w
Helge Hafting wrote:
>
> Vasu Varma P V wrote:
> >
> > Hi,
> >
> > Is there any limitation on DMA memory we can allocate using
> > kmalloc(size, GFP_DMA)? I am not able to acquire more than
> > 14MB of the mem using this on my PCI SMP box with 256MB ram.
> > I think there is restriction on ISA bo
Vasu Varma P V wrote:
>
> Hi,
>
> Is there any limitation on DMA memory we can allocate using
> kmalloc(size, GFP_DMA)? I am not able to acquire more than
> 14MB of the mem using this on my PCI SMP box with 256MB ram.
> I think there is restriction on ISA boards of 16MB.
> Can we increase it ?
On Thu, 5 Jul 2001, Christophe Beaumont wrote:
>
>
> > On Thu, 5 Jul 2001, Vasu Varma P V wrote:
> >
> > > Hi,
> > >
> > > Is there any limitation on DMA memory we can allocate using
> > > kmalloc(size, GFP_DMA)? I am not able to acquire more than
> > > 14MB of the mem using this on my PCI SM
> On Thu, 5 Jul 2001, Vasu Varma P V wrote:
>
> > Hi,
> >
> > Is there any limitation on DMA memory we can allocate using
> > kmalloc(size, GFP_DMA)? I am not able to acquire more than
> > 14MB of the mem using this on my PCI SMP box with 256MB ram.
> > I think there is restriction on ISA boar
On Thu, 5 Jul 2001, Vasu Varma P V wrote:
> Hi,
>
> Is there any limitation on DMA memory we can allocate using
> kmalloc(size, GFP_DMA)? I am not able to acquire more than
> 14MB of the mem using this on my PCI SMP box with 256MB ram.
> I think there is restriction on ISA boards of 16MB.
> Can
but we have a macro in include/asm-i386/dma.h,
MAX_DMA_ADDRESS (PAGE_OFFSET+0x100).
if i change it to a higher value, i am able to get more dma
memory. Is there any way i can change this without compiling
the kernel?
Arjan van de Ven wrote:
> Vasu Varma P V wrote:
> >
> > Hi,
> >
> > Is th
Vasu Varma P V wrote:
>
> Hi,
>
> Is there any limitation on DMA memory we can allocate using
> kmalloc(size, GFP_DMA)? I am not able to acquire more than
> 14MB of the mem using this on my PCI SMP box with 256MB ram.
> I think there is restriction on ISA boards of 16MB.
> Can we increase it ?
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