Aiden, Looked into this and here's what I found out. Only OPB_DDR supports 16-bit DDR memory right now and there are no concrete plans to add 16-bit support to PLB_DDR (it's been discussed, but nothing planned yet). So the only workarounds for this silicon issue are the two you mentioned - run with caches off or get a fixed version of the chip (I don't know what Avnet's plans are for your board).
-Rick -----Original Message----- From: [EMAIL PROTECTED] [mailto:linuxppc-embedded-bounces+moleres=xilinx.com at ozlabs.org] On Behalf Of Rick Moleres Sent: Wednesday, June 21, 2006 12:10 PM To: Aidan Williams Cc: linuxppc-embedded at ozlabs.org; Martin, Tim Subject: RE: Linux on Virtex4 Aiden, The cache issue I was referring to is the errata 213 that you tried. I'll ask around regarding the silicon issue - I don't know if there is a workaround for this on that board. -Rick -----Original Message----- From: Aidan Williams [mailto:[EMAIL PROTECTED] Sent: Wednesday, June 21, 2006 2:47 AM To: Rick Moleres Cc: Martin, Tim; linuxppc-embedded at ozlabs.org Subject: Re: Linux on Virtex4 Rick Moleres wrote: > There's also a Linux 2.4 patch provided with the ML403 PPC reference > design on the Xilinx website > (http://www.xilinx.com/products/boards/ml403/reference_designs.htm) that > takes care of a Virtex-4 PPC cache issue (CCR0 register). Have you > applied this? > Rick, which cache issue are you referring to? I tried setting the CCR0 bits in accordance with: "Solution 10: CPU_213: Incorrect data might be flushed from the data cache" but that didn't fix things in my case for the Avnet FX12 MiniModule. I'm pretty sure that the FX12-MM strikes: "Solution 13: The return of a cacheline transaction that is not target word first (non-target word first) can cause data corruption in the PPC405 Core data cache in Virtex-4 FX devices." For which the only solutions mentioned are to run without caches or get a fixed chip. As I understand it, the memory controller for this board must be on the OPB because the memory is 16-bit. Is there any way to move the memory controller to the PLB thus avoiding the cache problem (for RAM at least)? - aidan _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded at ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
