Hi,
Interrupts are wrong. I think because PIRQ/INTA/INTB... routing registers may not be set correctly. (regs 0x50 something in SB) Why is LAPIC disabled? The VT8237R code always expects APIC to be working, and it enables APIC mode.
Please check with orginal BIOS in what mode SB operates or get the lapic working if it has some.
Thanks, Rudolf