The JMicron JMB363 is a single chip, one-lane PCI Express to two-port Serial ATA II and one-port PATA Host Controller often found embedded in motherboards and in low-cost add-on cards. The JMB363 is designed to provide two-port SATA II and one-port PATA connectivity. The JMB363 supports both AHCI and Legacy IDE controller to increase system feasibility, including Native Command Queuing (NCQ), Hot Plugging, ATAPI Device Supporting, Port Multiplier with Command-based Switching Supporting, Programmable Output Swing Control to fit SATA II Gen1m and Gen2m (External SATA Connection, eSATA). It features PCI Express bus and Serial ATA II interface to express high performance storage devices.
The chip supports operating in IDE, AHCI and RAID controller modes. Motherboard BIOSes allow choosing the operating mode, but add-on cards are stuck in RAID mode. The problem with RAID mode is that the standard Windows AHCI or IDE drivers cannot be used. A JMicron-specific driver is available for Windows OS's but this driver doesn't support functions like TRIM for SSD's.
On the page below 2 AHCI enabled option rom's are available, unfortunatly both these AHCI rom's didn't allow me to use an attached harddisk as boot medium. With the help of the author I created a IDE mode only option rom, this option rom allows you to use and attached harddisk as boot medium using the 'Standard Dual Channel PCI IDE Controller' Windows driver.