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Re: write alignment matters?
On Tue, Jun 21, 2011 at 12:03:10PM -0400, der Mouse wrote:
> Actually, I got the machine from a friend-of-a-friend who was a pretty
> hardcore SCSI geek in a former life (he now repairs organs, the musical
> kind). He would probably be the right person to ask about this; it's
> not totally implausible he might even have source to the firmware (I
> doubt he could release it to me if so, but he could look at it).
It's a 53c8xx: we load the "firmware" into it from our own driver. But
it may have hardware restrictions we mismanage. Assuredly we've had
that problem before.
Count your blessings at least it's not a 53c810 (siop). That chip holds
its own program in host RAM, so you have to contend with the whole usual
set of DMA synchronization issues twice over. The 53c8x (esiop)
have local RAM for the sequencer program; otherwise they're much the same
as everything back to the 53c700, but that single change makes a big
reliability and performance difference.
Thor Lancelot Simon tls%panix.com@localhost
"All of my opinions are consistent, but I cannot present them all
at once." -Jean-Jacques Rousseau, On The Social Contract
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