[lkml]   [2003]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [Pcihpd-discuss] Re: [BUG][2.5]deadlock on cpci hot insert
On Thu, 2003-01-16 at 21:32, Scott Murray wrote:
> Hmm, that's definitely not what I expected. For reference, my test ZT5550
> here yields HCF_HCS = 0x31a in a standard (non-RSS) cPCI chassis, which
> means both buses are active in my setup, and I'd expected the same from an
> Active-Active or Locked Active-Active setup in a ZT5084 chassis. I'll dig
> deeper in the host controller docs tomorrow as well as try and glean
> something from the rough 2.2 RSS code Intel/Ziatech released in late 2001.
> In the meantime, could you describe for me what you've got the "High
> Availability" options in your ZT5550's BIOS set to? Also, just so I'm
> clear on what your setup consists of, am I correct in my assumption that
> you only have a single ZT5550 in your ZT5084 chassis?
> Thanks,
> Scott

I actually have two ZT5550C boards each using a ZT96073 mezzanine board
(which contains a hard drive a floppy) and each with ZT4804/ZT4802 rear
panel transition boards.

I do not see anything in my BIOS (v5.15) about "High Availability" options,
but looking through the ZT5550 manual on the pt website, I noticed that
all ZT550 models before revision 'D' only have active-standby mode, so I
wonder if the bit we are looking at was only used in newer versions of the

For what it is worth, I messed around with all the possible combinations
of system master and peripheral boards that I had, and noted what HCF_HCS
was in system log.

HCF_HCS is not effected by the placement of the peripheral boards, but
I do see bits flipping on and off for all the different combinations off
system master board placements, and I also see bits flipping depending
on if the system board was freshly inserted, or if I just rebooted the
board without extracting/inserting.

Here is what I observed ==>

HCF_HCS Bit Observation
----------- ----------
HCS_HA always on
HCS_ACTIVE on if board is active
HCS_RH_STATE always off
HCS_HARD_RESET on if board was freshly inserted
HCS_SOFT_RESET always on
HCS_RH_ALIVE on if other system master is inserted
HCS_SWITCH_OVER always off
HCS_BUS1_ACTIVE always off
HCS_BUS2_ACTIVE always off

Like I mentioned before, I suspect that the last three bits are not
implemented on older ZT5550 boards (pre 'D' versions). In the docs
you have access too, is there reference to a register we could find
out which version of 5550 this board is for? That would make this
easy to solve.

hmm... if HCS_RH_STATE is talking about if the other system board is
active or standby, then we could assume both busses need to be added
if HCS_RH_STATE is not set. That is unless there such thing as being able to
completely turn off one of the busses.

BTW, I'm going to be at the Linux World show in NY next week, so I
will not be able to try anything new for a week.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:32    [W:0.092 / U:0.196 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site