From: Ralf Baechle <ralf@linux-mips.org>
To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: linux-mips@linux-mips.org
Subject: Re: ZONE_DMA on MIPS
Date: Mon, 19 Mar 2007 15:48:21 +0000 [thread overview]
Message-ID: <20070319154821.GA31766@linux-mips.org> (raw)
In-Reply-To: <20070320.000947.88474417.anemo@mba.ocn.ne.jp>
On Tue, Mar 20, 2007 at 12:09:47AM +0900, Atsushi Nemoto wrote:
> Some ZONE_DMA patches were merged in 2.6.21. On most MIPS, ZONE_DMA
> is not needed, isn't it?
>
> Currently JAZZ, MALTA, QEMU, IP22, SNI_RM, RBTX4938 defines
> GENERIC_ISA_DMA so they may need ZONE_DMA (though I wonder QEMU or
> RBTX4938 really need it...)
>
> Are there any other platforms requires special DMA zone?
Qemu supports more or less the full PC braind^Wheritage, including the
good old too-old floppy controller. IP22 supports Indigo 2 systems
which have EISA support, so we only want ZONE_DMA if EISA is enabled.
For a bunch of other systems ZONE_DMA may be required to support b0rked
PCI cards that only support like 31-bit DMA addresses or even less.
Ralf
next prev parent reply other threads:[~2007-03-19 15:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-19 15:09 ZONE_DMA on MIPS Atsushi Nemoto
2007-03-19 15:32 ` Sergei Shtylyov
2007-03-19 15:47 ` Atsushi Nemoto
2007-03-19 15:50 ` Sergei Shtylyov
2007-03-19 15:48 ` Ralf Baechle [this message]
2007-03-19 16:36 ` Atsushi Nemoto
2007-03-19 22:20 ` Ralf Baechle
2007-03-20 14:10 ` Atsushi Nemoto
2007-03-20 14:48 ` Ralf Baechle
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