On Sun, 2007-04-29 at 22:56 +0200, Guennadi Liakhovetski wrote: > Hi all, > > looking at tmscsim (again) I cannot persuade myself that the handling of > the RESTORE_POINTERS command is correct... Therefore a couple of > questions: > > 1. do any devices at all use this message-pair? Every *device* does ... they're a mandatory part of the SPI standard for devices doing disconnect/reselect > 2. are they ever sent apart from when accompanying the DISCONNECT / > RESELECT? I've never seen an occasion, no. > 3. if "yes" to 2 - can the RESTORE be used to "rewind" the pointer to a > value smaller than the current? Theoretically, yes. In practice, no device I've ever heard of has done this. > 4. Some LLDs just pretty much ignore the message. Thereby, AFAIU, they > just assume that this is just a part of the RESELECT procedure and that > they already have the proper context. Is it sufficient? Yes ... the only function use seems to be to save/restore across disconnect/reselect, so almost every SPI driver builds this in as part of the disconnect/reselect action. > >From which I'm trying to derive whether the handling in tmscsim is > correct, and, if not, how to correct it... Hope this helps. James - To unsubscribe from this list: 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
