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From: Oliver Amft <oam@gmx•net>
To: linuxppc-embedded@lists•linuxppc.org
Subject: PCI DMA memory problem
Date: Tue, 24 Jun 2003 21:01:21 +0200	[thread overview]
Message-ID: <3EF8A001.2090603@gmx.net> (raw)


I am implementing a network driver for a DMA device on a custom
405GP/GPr based board. The networking device is attached over PCI bus.
Kernel is currently 2.4.21. BIOS is PPCBoot 1.2.0.

To map the data buffers from skb the driver uses pci_map_single(). When
starting the kernel with SDRAM size configurations other than 32MByte
the device is unable to transfer data (currupted data) - descriptor
dword read/write-back works (set up with pci_alloc_consistent()). For
the kernel start option mem=32MB everything is fine (descriptor +
correct data).

I am wondering if someone has stumbled over this too - any advice
appreciated.

Thanks,
Oliver


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

next             reply	other threads:[~2003-06-24 19:01 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-06-24 19:01 Oliver Amft [this message]
2003-06-24 19:19 ` PCI DMA memory problem Chris Zimman
2003-06-24 20:22   ` Wolfgang Denk
2003-06-25 12:48   ` Mark Powell
  -- strict thread matches above, loose matches on Subject: below --
2003-06-26 12:36 Oliver Amft

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