On Wed, Mar 01, 2006 at 12:57:12PM -0800, Tarte, Robert wrote: > I have located an HP machine that is the same flavor as James' (HP > Integrity rx2600: ia64 with zx1 chipset). It exhibits the same problem. > I believe that the architecture may differ with traditional PC/PCI > architectures in how it deals with non-aligned PCI access. When I > converted the OCM initialization code to write on qwords instead of > dwords, the code was able to pass OCM initialization. It is possible > that the machine is doing a qword read/modify/write when accessing OCM > memory, which would explain the hang. I haven't hooked up a PCI > analyzer. The code now gets to the point where it is trying to read > NVRAM in order to get the SAS address. It seems that the machine is > unable to retrieve non-aligned byte accesses correctly. I will convert > the code to pull the correct byte/word/dword from the aligned qword. > We'll see if that fixes it. None of these behaviors are exhibited on > x86, x86_64, powerpc, and ia64 without the zx1 chipset. I understand > that there may be a few ARM implementations that have similar issues. You're saying that you do an 8-byte non-DMA write to an address that's congruent to 4 mod 8? Based on briefly skimming the internal documentation for zx1, I'd say you're invoking undefined behaviour. > Mike: any word on getting James a machine? > > Rob > > > -----Original Message----- > > From: Jeff Garzik [mailto:jgarzik@xxxxxxxxx] > > Sent: Wednesday, March 01, 2006 12:23 PM > > To: Tarte, Robert > > Cc: Mike Anderson; James Bottomley; linux-scsi@xxxxxxxxxxxxxxx; > > Tarte@xxxxxxxxxx; Jeff Garzik > > Subject: Re: [PATCH] aic94xx: driver assertion in non-x86 BIOS env > > > > Tarte, Robert wrote: > > > What model ia64 are you running James? I'll see if Adaptec has one > to > > > try to help reproduce this issue. Jeff, have you tried the fixes to > see > > > if they addressed the issues you were seeing (OCM error when BIOS > off > > > and booted off of SCSI)? > > > > Nah, I'm just waiting for James to ACK that things work on his side, > > really... > > > > Jeff > > - > : send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
