[OpenBIOS] Solaris anyone?

[Paul Brook]

> Hm. Fast/wide and synchronous should be no problem (unless there are
> certain timings expected).

Fast should be a non-issue.  Wide may be a problem if we get odd sized 
transfers wrong.  IIUC wide transfers are initiated by the target (disk) and 
qemu never does this, so should not be a problem either.

> Tagged command is a bigger issue, since afaik none of QEMU's HBAs support
> it.

Other QEMU HBAs (LSI53C895A) do support tagged command queueing, however the 
ESP does not.

By my reading qemu esp emulation is missing proper handling of MESSAGE phases.  
It assumes only a single IDENTIFY byte is sent, probably interpreting 
subsequent SIMPLE queue tags as the start of the command block.
Implementing full command queueing is fairly tricky.  However a stub 
implementation that accepts the tag but avoids disconnecting (force sequential 
execution of commands) should be somewhat simpler.

Paul