Hi, I've found a few datasheets from qlogic, on ISP1040x, ISP1080 and ISP10160. The ISP1040 doesn't mention any 64-bit capabilities in the chip. This first appears on the ISP1080 and higher. This information is consistent with what I find in trial and error tests on my ES40. Once bus addresses go beyond 32-bits in allocating space for S/G-buffers, I start seeing file system corruption with the ISP1040-cards. Thats said, according to the datasheet for the ISP1040 the chip conforms to the PCI 2.1 specifications, which has "64-Bit Bus Extension Pins" as optional for DAC commands and REQ64# and ACK64#. This capability is never mentioned in the datasheet and there are no pins for REQ64 or ACK64 on the chip, they appear in later ships (1080 and onwards). In the qla1280.c driver there is an enable_64_bit_addressing in NVRAM for 1040 cards, but when I look at the NetBSD driver for the same card, this feature is only available in ISP1080 cards and higher. So there seems to be some inconsistency here. Magnus
