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Tyan S2895 Thunder K8WE mainboard with 4 x nVidia SATA ports working. Installed a new PCIe 4-port SATA controller for a 2 TiB Seagate drive. System hung during boot at the time it would be doing the chkdsk on the new drive. OS2AHCI.ADD added to config.sys in front of DANIS506.ADD. Long story short, I swapped the new HD to a mainboard SATA port with a Plextor DVDRW on the new controller. Still hung, this time on OS2CDROM.DMD. I remmed that out, and it booted OK. TESTLOG was run, hopefully with some good info.

After first boot sequence eCS hangs during checkdisk session (see attached screenshot). System boots without problem when using DANIS506 (JMicron Adapter supports also traditional IDE). One HD is running on this controller (WD10EADS), this drive is AHCi-capable. Three other HD's are connected to the Mainboard's SB 700 controller, which is running in IDE mode. A serial debug log is also attached to this ticket. It ends exactly after the third checkdisk should occur. After pressing the reset-button on the machine, the second attached trap000d in OS2BOOT occurs. It does not occure during boot w/o serial debug log.

Normally an OS/2 driver can be loaded with a /V option so it outputs information. We have an option in our preboot menu of eComStation that switches it on. For example the Danis506.add shows disc output (what controllers are found and what discs are found).

If we specify the /V with the driver it mentioned as an illegal switch and the driver does not load.

Maybe its also more convenient that if a switch is illegal the driver still loads. Instead of not loading. Otherwise you need to boot from to alter the config.sys.