On Mon, Feb 15, 2016 at 12:00:48PM +0000, Zeh, Werner wrote: > Hi Kevin. > > We had some issues with some connected AHCI devices in SeaBIOS. We > have connected some CF-Cards by using a simple SATA<->IDE bridge to > the mainboard and in some cases, the drive (which is the CF-card) > was not recognized correctly. After some deeper analysis we found > that SeaBIOS does not set up the transfer rate which is used to > communicate to the drive. The supported transfer rate can be found > in the data structure which is delivered by IDENTIFY_DEVICE command. > > So in our error cases the default transfer rate was too high and > therefore data error has occurred. I have attached a patch which > will deal with this case on AHCI controllers. Maybe you can push > this patch to mainline or at least have a look at it. > > Up to now I have verified the function of this patch with the latest > master branch of SeaBIOS and a Broadwell-DE CPU. I have used PIO4, > default PIO, Multiword-DMA2 and several Ultra-DMA CF-cards to ensure > that all three paths work properly. > > BTW: I am not that familiar with code style in SeaBIOS. If I made > some formal mistakes, feel free to correct them.
Thanks. I'm not that familiar with the AHCI internals. Gerd, would you be able to review? -Kevin _______________________________________________ SeaBIOS mailing list SeaBIOS@seabios.org http://www.seabios.org/mailman/listinfo/seabios
