[LinuxBIOS] Mode Register Set raminit.c

Hello,
I am not sure I understand the Mode Register Set of 0x1D0. For the  
i440bx and i82810.

According to the JEDEC datasheets this is not a valid setting.
For CAS3 in normal mode this should be set to 0x30.

I am just trying to understand where 0x1D0 is coming from. Can anyone  
point me to a datasheet that expains this??

Thanks - Joe