PCI card bug list
From MCEWiki
U0105 bugs
- STATUS[DMA_RESUME] flag is not cleared after the error is handled. Innocuous.
- STATUS[HST_NFYD] flag is half-used, not cleared. Innocuous.
- Asynchronous MCE reply NFY does not seem to play well with QTS TAIL updates. I.e. some part of the system breaks when a QTS is issued between a CON and the associated NFY REP.
U0103 bugs
- Data packets can fail to HST properly. This was observed in MAS driver, and only recently in DAS. In one instance, DAS failed with a timeout after receiving 1381/2000 frames and could not take data (though other mce commands worked) until the driver was reloaded. This looks to me like lost HST replies. The NFY comes through and the HST gets sent but then everything hangs.
- After some failures (card lookup?), one-behind state emerges. "Reset" doesn't help, nor does "reset_mce". A command must be issued (which returns as unmatched), and then reset dsp will fix the problem. I'm not even sure where the packet is trapped.
A1.5 / U0103 design issues
- PCI reset doesn't empty the FIFO! FIFO is cleared on preamble error. But that means you have will definitely lose an MCE packet if buffer gets out of sync. Reset is 2 ms long; perhaps this is a way of waiting for an entire reply to have been transmitted? A PCI reset routine should clear the FIFO. Either that or a separate vector command, but that seems like overkill.
- Since packet choke is on after a reset, any words in fifo get discarded without a preamble check; this means that FIFO can't be reset before the first MCE command. This is silly; reset should clear the fifo!
