opnsense-src/sys/dev/ata/chipsets
Alexander Motin 709c835a5a Disable 32-bit PIO for 6Gbit/s Intel SATA controllers.
For some reason 32-bit PIO writes are not working on 6Gbit/s Intel SATA
ports, while 16/32-bit PIO reads and 16-bit PIO writes are working fine.
3Gbit/s ports on the same controllers have no this problem.

Workaround this by disabling 32-bit PIO for all Intel controllers that may
have 6Gbit/s ports.  It halves PIO performance from 6MB/s to 3MB/s, but
who bother about speed of such rare and slow mode, which is also highly
discouraged by SATA specifications?

MFC after:	2 weeks
2015-08-08 11:48:11 +00:00
..
ata-acard.c
ata-acerlabs.c
ata-amd.c
ata-ati.c
ata-cenatek.c
ata-cypress.c
ata-cyrix.c
ata-fsl.c
ata-highpoint.c
ata-intel.c
ata-ite.c
ata-jmicron.c
ata-marvell.c
ata-micron.c
ata-national.c
ata-netcell.c
ata-nvidia.c
ata-promise.c
ata-serverworks.c
ata-siliconimage.c
ata-sis.c
ata-via.c