>> Yeah, I was wondering if any commands could have <512 bytes response... >> I sort of convinced myself that the answer was no for ATA commands, but >> stupidly forgot about packet (SCSI) commands. Their results are >> obviously shorter than 512 bytes. > > Are you referencing the sglist underflow patch? (#5 instead of #3)
Hmm, yeah. > There were cases in the code already where we /assumed/ that having any bytes > implied we had at least a sector's worth. Even for ATAPI? If there are valid cases for > the sglist to have less than a sector's worth (SCSI) then I'll need to > touch that again as well and update all the assumptions in the IDE code > to look for numbytes instead of numsectors. cmd_inquiry can return 36 bytes. That can be both PIO and DMA. SeaBIOS only uses the DMA variant for AHCI. Paolo
