I'm upgrading a net5501 with a Travelstar E7K100 IDE drive from FreeBSD 6.2 to 7.0. FreeBSD 6.2 set the IDE controller up in UDMA33 mode, but unfortunately 7.0 chooses UDMA100. From my tests, the fastest safe setting for this hardware appears to be UMDA66, as UDMA100 gives occasional errors such as "ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=3871". This is the same on comBIOS versions 1.32i and 1.33.
Is there any way to force FreeBSD 7.0 to use UDMA66, or failing that, UDMA33 ? I could disable UDMA by adding 'hw.ata.ata_dma="0"' in /boot/ loader.conf, but that would run slowly. I could put a script in /usr/ local/etc/rc.d to invoke "atacontrol mode ad0 udma66", but that would still leave the system running in an unstable configuration until that script was invoked. Any ideas? I'm wondering whether I'll need to patch the kernel source, and if so, how difficult that will be. It would be nice if / boot/loader.conf had a switch for this, but I haven't spotted any documentation for such a thing. Cheers, - Martin. _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
