From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3EFAE8C6.2070809@gmx.net> Date: Thu, 26 Jun 2003 14:36:22 +0200 From: Oliver Amft MIME-Version: 1.0 To: chris@cryptoapps.com, wd@denx.de Cc: linuxppc-embedded@lists.linuxppc.org Subject: Re: PCI DMA memory problem Content-Type: text/plain; charset=us-ascii; format=flowed Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: 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/