Re: kern/55067: bge(4) does not work on MIPS systems (it panics)

[Jason Thorpe <thorpej%me.com@localhost>]

> On Mar 12, 2020, at 3:40 PM, Michael van Elst <mlelstv%serpens.de@localhost> wrote:

> mips _bus_dmamap_sync erroneously traps len == 0. It should be gracefully
> allowing that value like other archs.

Yah, it stops crashing once I fix that.  But it still doesn't work.  Although, I think THAT problem is an issue with my test set-up.  I'm using it in a 32-bit slot, but I suspect the firmware on the board thinks it got plugged into a 64-bit slot; I noticed that my "gsip" board also thinks it's connected to a 64-bit slot on this system.

I believe that ACK64# and REQ64# are supposed to be left floating on a 32-bit slot (I need to re-read the spec to be sure).  I'm guessing that they're being pulled in some direction they're not supposed to be on the Qube2 mainboard, causing the card to mis-detect.  That will cause half of the data path to march off a cliff.  Luckily, to make these cards physically fit the machine, I have to use a couple of risers in a sort of Rube Goldberg arrangement, so if I'm right about what's supposed to happen with ACK64# and REQ64#, I'll simply cut those traces on the risers.

-- thorpej