Hi, I have a Altera socfpga platform that implements a very basic ATA PIO0 Compact Flash controller in the FPGA and I have a very basic PATA Linux driver that does MMIO to the FPGA registers and configures 3 GPIOs for power, reset and card detect. It's basically a copy of pata_platform.c with a check_status function to read the card detect GPIO and if a card is detected, it switches on the power GPIO and deasserts the reset GPIO. The driver and FPGA CF controller work fine together for me except for an intermittent issue where on boot I occasionally see the following: [ 5.836242] ata1: link is slow to respond, please be patient (ready=0) [ 10.816241] ata1: device not ready (errno=-16), forcing hardreset [ 16.016250] ata1: link is slow to respond, please be patient (ready=0) [ 20.876239] ata1: SRST failed (errno=-16) [ 26.076243] ata1: link is slow to respond, please be patient (ready=0) [ 30.936243] ata1: SRST failed (errno=-16) [ 36.136243] ata1: link is slow to respond, please be patient (ready=0) [ 65.956240] ata1: SRST failed (errno=-16) [ 70.976238] ata1: SRST failed (errno=-16) [ 70.981059] ata1: reset failed, giving up This is occurs when there is no CF card plugged in, so I don't understand why the driver appears to be trying to communicate with a Compact Flash device? I'm a little stuck trying to figure out how to properly handle a hot pluggable CF card, so any advice on this would be much appreciated. Nathan