> > May be, I miss the point. Why do you want to disable > > dma on the cf card, when you can instruct FreeBSD > > to just not use dma (atacontrol(8)) ? > > Because newer CF cards, like the SanDisk, negotiate DMA with the > controller. However, most of the IDE <-> CF Adapters aren't properly > wired for this, as they only implement CF 1.5 and not CF 2.0. So, > when FreeBSD goes to access the device, you get all kinds of timeout > errors. If you are lucky, ata will failback to PIO mode. Most of the > time it has bitten me, I've not been lucky :-(. > > hw.ata.ata_dma=0 is the magic. You can set it at the boot loader > prompt, or you can add it to /boot/loader.conf. atacontrol is way too > late, since this disabling must be done prior to geom's scan for root > (or the moral equivalent in 4.x).
Ok, I understand. But you can't do that selectively on a per-device basis, can you? Norbert _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-small To unsubscribe, send any mail to "[EMAIL PROTECTED]"
