From: Oliver Amft <oam@gmx.net>
To: chris@cryptoapps.com, wd@denx.de
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: PCI DMA memory problem
Date: Thu, 26 Jun 2003 14:36:22 +0200 [thread overview]
Message-ID: <3EFAE8C6.2070809@gmx.net> (raw)
The problem was a wrong PCI configuration of the 405 with two colliding
PCI target mappings (PTM1 and PTM2).
Oliver
>> 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).
>
> My first thought is -- is/are the SDRAM bank(s) configured correctly?
>
> I don't know that it'd necessarily be related, but for the 405GP,
> PPCBoot 1.2.0 doesn't have the PCI bridge setup quite right for all
> PCI devices (eg. 82559 won't work). I have code to fix the bridge
> setup if you need it -- although I'm not even certain they exist in
> the GPR.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next reply other threads:[~2003-06-26 12:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-26 12:36 Oliver Amft [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-06-24 19:01 PCI DMA memory problem Oliver Amft
2003-06-24 19:19 ` Chris Zimman
2003-06-24 20:22 ` Wolfgang Denk
2003-06-25 12:48 ` Mark Powell
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